2015 gmc sierra alternator problems. 6V on multimeter and needle looks like this: 80K miles.

2015 gmc sierra alternator problems I have had my truck a little close to a year. Trying to figure out an alternator overcharging issue. So we replaced plugs, wires and coils on all 8 Cyl. Issues can arise from a failing alternator, a loose or worn drive belt, or problems within the electrical circuit preventing efficient charging. 9 recalls have been issued for the 2015 GMC Sierra 1500 by the NHTSA. 2 after 10 to 15 Jan 14, 2013 · Hi Everybody, Recently noticed that my voltage in my truck is very high. Or, take the alternator to an auto parts store for a more sophisticated ripple check and a load check - usually a free service. Price, assembly, diagnosis, you can expect to acknowledge every aspect relating to the alternator. Sep 7, 2022 · Alright guys I just purchased a used 2014 GMC Sierra. Anytime I leave the key on but the truck not running, like to listen to the radio or roll the window down, the light will come on. 3 engine my alternator seems to be fluctuating between 12 V and 14. On starting the truck I now have these issues. Jun 30, 2022 · The alternator is the power station of GMC Sierra 2500 HD that converts mechanical energy from the engine to electricity. i saw maybe 50% improvement before I changed the alternator. My question is should I go back with the stock 145 or upgrade to 160? Pros or cons of either? Also, I pull a travel trailer so I’m not sure if that matters. 5. 6 Duramax with a 150A alternator. The alternator’s job in your Sierra is to provide electricity as it is running. I took it to Advance Auto Parts and they tested both, saying the alternator output voltage was too high. It stayed there for 15 miles until I got home. so I stopped and seen if it was still under warranty. However, battery tests at 13. oreillyauto. It not only powers all the Apr 8, 2021 · Find 2015 GMC Sierra 1500 recalls information, reported by the NHTSA, and we will help you find a nearby service center where you can get your car fixed. I have a new battery and alternator that I bought already but still keep going dead . In this article we go through most common causes of Sierra 1500 breakdown and how you can fix the problem. g. Mar 1, 2023 · GMC Sierra 1500 is a reliable road companion, but its a machine with hundreds of interconnected parts, and like any other machine it sometimes fail to deliver normal operation. It all started when I noticed that the alternator was over charging at 15. Any Ideas are appreciated. Your Sierra's battery will not be able to keep the accessories and engine systems running for long without a properly Easy Way To Diagnose Failing Alternator Chevy Silverado GMC Sierra Dustin T 56. Jan 24, 2025 · The GMC Sierra is a powerful and capable truck, but like any vehicle, it can experience problems. The procedures will work on a GMC Sierra. same exact reading at the solenoid. Is this overcharging and will it cause damage? I did a search online and some sites say it will be fine if the engine isn't running 24/7 GM Truck Electrical & Ground Issues FIX!!! Silverado, Sierra, GMC LegacyJR 5. Dec 10, 2022 · Yesterday my Alternator went to dimming lights and charging from 12-16 amps back n forth. If you suspect that you have alternator problems, it's something that should be dealt with before you end up stranded somewhere. 7 volts. took starter off and oreillys tested it 4x, good each time. Follow us on IG:Yonke_Oxcfilms May 11, 2015 · I have a 2012 Silverado with the 5. Not understanding how the system works can confuse you into thinking the alternator is bad Jun 26, 2012 · Could someone tell me what to look for? Sometimes at idle my truck Bounces from 600 to 400 rpm and the lights dem. I bought it used about 6 months ago and assumed the battery was stock so I figured it may be time to swap it out. If your GMC is having trouble starting, it may be a sign that the alternator is failing. Im guessing open ground somewhere. Nov 16, 2023 · GMC Sierra trucks are known for their reliability and performance. . The alternator provides power to the battery, which is necessary to start the engine. Aug 3, 2019 · Models: 2005-2009 Cadillac Escalade Models 2005-2009 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe 2005-2009 GMC Sierra, Sierra Classic, Yukon Models Voltmeter Fluctuation Condition: Some customers may comment that the voltmeter is fluctuating between 12 and 14 volts on their full size pickup or utility vehicle. Locked in service 4WD notice on dash display, door locks don't work, AC blower does not work, radio will not turn on, no display on the center console, windows on the passenger side do not work, right front Feb 2, 2014 · 2008 GMC Sierra Crew Cab 4X4 (wifes) Zone lift set close to 4" 305/70/17's Hankook Dyna Pro RF-10 ATM Save Reply Quote Like duramaxsky 12,485 posts · Joined 2009 #17 ·Feb 3, 2014 Mar 16, 2021 · GMC Sierra 1500 – (photo by GMC) The most common causes that hinders normal operation of air conditioning system on your GMC Sierra 1500 are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. Also please check out the statistics and reliability analysis of GMC Sierra 1500 based on all problems reported for the Sierra 1500. I would suggest starting with using a voltmeter to see how the gauge reading matches what you get. Mar 25, 2024 · As a result, you’ll notice some pretty major issues with your car when you need an alternator repair. The recall involves certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500 models. Thanks for shopping at GM Parts Store your GM Parts Direct source online May 8, 2017 · Hi, my truck requires a jump to start. Also put in new battery at that time as. Had overcharging issue and replaced alternator after mechanic said issue was internal voltage regulator. During the test I was told the battery is good but my alternator is charging at 15 amps and should only The next day after that I took the truck camping. 2 VDC. Part number for cable: 84634113 $65. The power windows still function, but you have to manually hold the switch to fully close or open the windows. Nov 15, 2024 · The only problem electrical I had with my older diesel was the alternator wigging out and was randomly changing at 20v. It's output will vary from 11. after two weeks same symptom Correction 1 Inspect for any high resistance and/or loose connections at both the battery fuse block and the positive or negative battery cables. My battery warning light is on, and the battery is not charging. . Normal voltage on In this video I discuss the common issues you may encounter after replacing the alternator with a new or rebuilt alternator. 09 5. Any ideas on a good way to Jun 30, 2022 · The alternator is the power station of GMC Sierra 3500 HD that converts mechanical energy from the engine to electricity. This morning it showed the Oct 19, 2024 · That doesn't make sense. Well Jun 15, 2015 · For any of you northern plow owners out there, GM has an issue with the new 2014 and 2015 alternators on the Snow Plow Prep package for the alternators being to strong for the plows. Since then, I replaced the fan harness (the 'new' new one is fine), and up until today, my charging system was fine. Thank goodness it was . Please also check out the statistics and reliability analysis of the 2014 GMC Sierra 1500 based on all problems reported for the 2014 Sierra 1500. Jan 24, 2014 · I was a little cold today (-4 F) I used the remote start to warm up the truck before I left work. Ive done some research and can only find that Jun 15, 2015 · For any of you northern plow owners out there, GM has an issue with the new 2014 and 2015 alternators on the Snow Plow Prep package for the alternators being to strong for the plows. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Oct 1, 2011 · Should be 13. 3 DC. I also want to check the alternator. While driving the voltage reads about 15. This frustrating condition limits the truck’s performance, often leaving drivers stranded or unable to enjoy their vehicle’s full potential. Condition/Concern: Dec 19, 2017 · In the event that the alternator of your GMC Sierra seems not working, here are our recommendations to analyze and take action to correct this component of your automobile. and the battery light was on. When I move my Jun 7, 2024 · The GMC Sierra is known for its reliability and robust performance. And I'm not Why does the alternator fuse blow in the Sierra? The most common reasons for the alternator fuse blowing are: Short circuit in the wiring: a short circuit in the cables connecting the alternator to the battery or other electrical components can cause excessive current flow, which makes the fuse blow to protect the system. This is my first year plowing with it and the alternator seems to be struggling with it at night. 3 since May and it has 83,000 miles. dealer said they found a loose ground. To open with I didn’t get the extended warranty they were offering bc I was trying to keep my payment down. 1963 Chevy Nova SS Under the Knife Save Reply Quote Like J83 5,030 posts · Joined 2014 #23 ·Feb 14, 2019 (Edited) Dec 22, 2020 · First post here but peruse this site quite a bit I'm at wits end when it comes to a parasitic draw on my 215 Silverado. Recently acquired 2006 silverado with lq9 engine. Mar 30, 2025 · The alternator output is controlled by the computers in the truck. Always started right back up but the problem persisted when turning corners slow. Problems with the climate control can be frustrating, affecting your 2017 GMC Sierra 5. Feb 11, 2011 · Just like the title says I have a big drain some where and its killing my battery. I have an issue where my CTS shows warm start voltage as 14. Truck: '14 Silverado 5. the in dash information display will also change every now and then, I will have it on Sep 15, 2023 · It's not impossible, but unlikely for the alternator pulley itself to be the problem, short of chunks being missing from the pulley or the belt being cut from misalignment (which was happening to someone else on the forum because their harmonic balancer failed and the crank pulley was walking around). 8 VDC to 14. If the problem seems related to the alternator, starter motor, or fuel system, it’s best to have a professional diagnose and repair it. I connected my battery charger/ alt tester first to the driverside battery, it read bout 62% for the alt and 13. How can I find out if the issue is with the alternator or if there's another problem? Battery went dead on my 2015 silverado 1500, replaced it. If you’re wondering, “Why is my GMC Sierra in limp mode?” you’ve come to the Jul 19, 2013 · The OP came back later after this thread ended and posted that the alternator didn't fix his issue volt gauge dipping down locks going crazy climate control reset. started up truck charging system went to 14. In this article, we'll discuss the signs of a failing alternator in your GMC and what you can do about it. Jun 14, 2023 · Diagnosing Service Battery Charging System: GMC Sierra Using a Diagnostic Scan Tool To diagnose issues with the Service Battery Charging System in your GMC Sierra, start by using a diagnostic scan tool. This gets a bit more intricate. I pull a travel trailer (Keystone Hornet). It's designed to prolong battery life and help (ever so slightly) with MPG. 0L V8, Automatic, Ext cab ShortBed,Fisher SS XV 8. Alternat It is nonstop repairs with these buckets. Don't let alternator issues leave you stranded Causes and fixes for a Chevy or GMC that has a "service battery charging system" message on the dashboard. My truck keeps going dead I assume I needed a new battery and alternator. I have 2013 Silverado 1500 LT with 160+ and she's been acting up the last couple of weeks. 3 liter. 8. At battery , I found voltage was 12. Mar 4, 2024 · Learn about the GMC Sierra years to steer clear of, uncovering common issues and problems with specific models to make an informed buying decision. Is your silverado or sierra showing low or high battery voltage? This video will explain why! GMC randomly stalled out and electrically dead. Jun 3, 2021 · I have a 2015 GMC Sierra SLT with a 5. 6v. Oct 20, 2021 · Have a 2013 LML Duramax Denali 2500HD with 86K. but when connected to the passenger Battery or alternator problems: a low-voltage battery or an alternator that does not properly regulate the charge can affect the vehicle's electrical system, causing the starter motor not to function correctly. When I got to the campsite I put the trailer down, realized I had it wrong and reconnected it to move it a few feet. Now it will run fibne for a few Jul 23, 2014 · View the 2015 GMC Sierra 1500 Crew Cab recall information and find service centers in your area to perform the recall repair. Jan 15, 2015 · I had problems with the battery dying and not being able to start the truck in November of 2014. I do have subs though but usually the voltage should drop. Mar 24, 2022 · My 2014 has done something similar a couple times. The main ground locations on a 2015 GMC Sierra include key spots under the hood and near the battery. Plug the tool into the vehicle’s OBD-II port and read the trouble codes related to the charging system. Feb 1, 2020 · Be that as it may, dimming is often a alternator problem. I can go about two days with out starting my truck and its dead. 3L V6 Alternator Replacement / Upgrade Car Won't Start: Alternator or Battery? The easy way to know Dec 26, 2024 · The GMC Sierra 1500 is a popular and reliable pickup truck, but even the most robust vehicles can experience starting problems. So I need help. luckily I had a Bluetooth obd2, so I could see exactly what was happening. 3L 1500 So, I have a bit of a issue. This past December I had to get it jump started a few time. Shown on GMC Yukon Tahoe Sierra Danny Johnson’s Garage 123K subscribers Subscribe Equip cars, trucks & SUVs with 2015 GMC Sierra 1500 Alternator from AutoZone. I replaced both battery and alternator in the beginning of December. in this video I show how to change it. Is your Chevy Silverado or GMC Sierra (2014-2019) refusing to crank or start when you turn the key, or are you having intermittent starting issues? Don't panic! In this step-by-step guide, we'll Oct 24, 2019 · List of safety problems and recalls for GMC SIERRA 1500 produced in 2015 Feb 14, 2020 · Check the charging system diagnostic test for the 2015 GMC Sierra 1500. Dec 21, 2021 · A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Get reliability information for the 2015 GMC Sierra 1500 from Consumer Reports, which combines extensive survey data and expert technical knowledge. For me, the fix (so far) has been a new Dec 19, 2022 · A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. One common issue that Sierra owners may encounter is limp mode. Jan 7, 2022 · Use a good multimeter to also see if the alternator is sending out a lot of alternating current which equals - one or more bad diodes in the alternator bridge rectifier section. If there is an excessive load on the electrical system that is Dec 19, 2019 · General Motors is recalling 350,371 full-sized pickup trucks at risk of electrical problems and stalling. com) That was his last post here and he never came back with the final solution. 2K subscribers Subscribe May 25, 2014 · Diagnosing charging system problems on a GM vehicle equipped with the EPMS system The EPMS system monitors battery usage with the battery current sensor. Select your GMC's Year and Make. But after it warms up, drops to 12. 3L Danny Johnson’s Garage 120K subscribers Subscribe Nov 29, 2018 · Anyone been successful in lowering the max voltage output from the alternator? 2017 Silverado 1500 LT Z71, stock everything. 3 Completely Dead Multiple Problems 🤔🤔🤔🤔 2014 Silverado 1500 LT 4. com/detail/c/acdelco/battery---accessories/battery-cable/97f343b1aaa1/acdelco-bat To find your genuine GMC Alternator. Same thing has happened in I have been having some issues with the battery charging system until the alternator finally gave up. May 3, 2016 · I went to the local Autozone to have the battery tested on my 2011 5. 3, I am having the weirdest charging problem, when coming to a stop my alternator drops to around 9-10 volts and it'll usually stall if I don't throw it in neutral and bring the rpms up, as long as I brake in neutral it's fine. Jun 30, 2022 · The most common symptoms of bad alternator in GMC Sierra 1500 is the red battery warning light turns on in the dashboard, electrical issues, dim lights, slow cranking, dead battery and stalling engine. Alternator going bad in your Sierra HD is a critical issue and it can be dangerous to drive your vehicle on the highway due to very high risk of Jan 13, 2014 · Date of the problem: 09/10/2015 If stuck in the "Start" position, the ignition may suddenly snap back into the "Accessory" position, causing a loss of engine, steering, and braking power, increasing the risk of a vehicle crash. Also clean the tb. If the voltage is not good, then you have a ground problem or a short to ground. The Sep 26, 2012 · The alternator is not like a light switch as either on or off. alternator tested good at autozone. 5 and alot of fancy lights erkoehler;1124302 said: Feb 12, 2019 · 2007 GMC Sierra Classic ECSB Stock for now 2000 GMC Sonoma SL 4x4 - Wife sold it. Jumped it and it ran fine and no issues at all with the ride. Took truck to Interstate to get battery checked they told me alternator wasn't charging right Aug 18, 2015 · Hello, this is my first post but ive been reading these forums for awhile. The most recently reported issues are listed below. Any suggestions? Oct 12, 2021 · A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Thank you in advance. 3L V8 The Die Hard Gold 94RH7 battery that was in it died. A populated list of Genuine GM OE GMC parts specific to your vehicle will appear below. One common problem you may face with your GMC Sierra is related to the blower motor. Im setting my truck up for off grid work so it Nov 1, 2017 · Two problems related to alternator/generator/regulator have been reported for the 2014 GMC Sierra 1500. is this a sign of a bad Alternator or another problem? As your GMC dealer, we don’t want you to ever be stuck on the side of the road. 2. However, like any vehicle, it can face issues, especially with its climate control system. Dec 9, 2022 · Hello all, I have been having problems with my alternator over charging now for about 2 months. Sep 11, 2019 · One of the most critical engine components in your GMC Sierra is the alternator. We’ll cover the symptoms of when an alternator goes bad, and how to diagnose a bad one (which is really pretty easy). I have a 2015 GMC sierra 1500 5. Mar 10, 2023 · Hello, I just changed the battery in my 2014 Silverado and the alternator is charging the battery at 15v; I always thought it was supposed to be 14-14. The issue occurs when the battery voltage drops below a certain level (which happens at low speed while turning due to the load) and causes the BCM to basically reboot. Feb 26, 2016 · 2015 GMC Sierra 2500HD SLE 4x4, 6. I did some research and everything pointed to the alternator so I changed that. If the alternator is still not c Jun 8, 2023 · My battery died and I changed it out. Didn't work but it worked for a few days. Jan 22, 2025 · Discover common Duramax diesel problems across generations, including LB7, LBZ, LML, and LMM Duramax problems, with tips for every model. Apr 27, 2011 · S0 I have about 130000 mles on my 06 dually. 5+ volts to 15+ volts depending on demand, battery condition/temperature, etc. Customer: I have a 2015 GMC Sierra 2500HD 6. Has anyone had this issue and Jan 14, 2018 · GMC Sierra 1500 owners have reported 5 problems related to alternator/generator/regulator (under the electrical system category). Jun 10, 2022 · If your GMC Sierra 1500 is hard to start, has slow crank, or makes clicking noise when you try to start the engine, it most probably is due to dead battery. This can be caused by frayed, damaged wires or wires in contact with Apr 9, 2019 · I have a 03 1500 sierra with a 5. Get normal voltmeter fluctuations, RVC functionality, and common issues at RepairPal. Ive done some research and can only find that Jan 1, 2025 · When should I call a mechanic for starting problems? Call a mechanic if you’ve checked the common issues and your GMC still won’t start. The last time it happened I grabbed the negative battery cable and tugged on it and the lights came right back on. When I was pulling out of storage I realized I forgot to plug in the electric from the truck to the trailer so I jumped out and plugged the cord in. If the alternator tests good out of the vehicle, and you have good charging voltage across the batteries, then you are looking for a load on them. Rick, look up Regulated Voltage Control (RVC) and Electronic Power Management (EPM) for GM trucks. Nov 26, 2023 · The alternator output is controlled by the ecm, so it's output will vary depending on what power is needed by the truck and the batteries state. it's a 2018 gmc denali crewcab I bought the battery and alternator at the gmc dealership Jan 13, 2023 · I got a new to me 2014 2500 with the 6. A new voltage drop test in Service Information (SI) can help in determining which component may be causing a parasitic draw. 4, then climbs up to 15. Dec 5, 2022 · It’ll usually come on when your GMC Sierra’s charging system voltage drops below 13. 3L double cab. After 30 seconds you hear the idle change, voltage drops to 13. Decided to throw the 160amp alternator in there from autozone all of the problems went away. 3. Most alternators made today include a voltage regulator that ensures the voltage level remains constant. This video discusses issues with the 2017 GMC Sierra stalling or shutting off while driving, focusing on electrical problems and potential solutions. At first I thought the battery was bad, so I replaced that, but it didnt seem to help anything. This can be caused by frayed, damaged wires or wires in contact with Dec 19, 2019 · General Motors has issued a recall for the 2019-2020 Chevrolet Silverado and GMC Sierra pickup trucks, as they may have alternators that were wired incorrectly. 7 V on my dashboard gauge while my truck us ideling, foes the alternator need replacing Aug 25, 2020 · Turned the key and heard a single click up near the engine compartment. I stayed at idle until I saw the battery voltage come up to 14-15 volts. Aug 31, 2009 · Hello All, So has anyone had any luck in figuring out what is causing the battery drain issue on our trucks? I've googled the issue until my fingers have bled and still have not found an answer. 2L, 5. When I got in the truck the service battery charging system was on the dash. i hooked starter to battery Jan 8, 2022 · The alternator would charge the battery at idle and low rpms. I have changed the alternator, battery, and voltage sensor. All my electronics and everything else is working normally. I replaced with the same. Nov 8, 2023 · I’ve owned my 2015 Sierra 5. Here is what I did to fix the problem for good! Alternator Fuse Check this first, if new alternator is not charging. Jun 3, 2019 · Little late to the party here but I had the same issue on my 2014 Sierra. Nov 19, 2024 · Learn how the alternator works in a GMC Sierra, signs of issues, replacement steps, and maintenance tips to keep it running smoothly. Years ago I had an alternator go bad on my Chevy truck (lots of miles and bearing went) so I bought cheap rebuild from auto parts store. This electrical Aug 27, 2019 · Hi, this is my first post to the forum. Jun 9, 2019 · Alternators don’t always go bad in the exact same way. In the video, LiveFast shows how to remove and replace a dead or weak alternator. But while waiting on them to check for part, I was wondering why you can't buy a regulator anymore and replace it Mar 16, 2020 · my radio in my 2015 Duramax is acting crazy, its like a ghost is touching the touch screen, ill have it on the radio and it will change to the clock screen and it will go to the list of radio stations. 3 | Chevy Silverado and GMC Sierra Forum (silveradosierra. Starter didn't turn the engine over at all or even try. And when the truck starts, voltage reads around 14. However, like any vehicle, they can encounter some issues. If the charging system is faulty, your GMC car battery may not recharge as expected, leading to a gradual drain over time. Driving at night was a nightmare cause the dash lights, and headlights flickered. 3 SIGNS YOUR VEHICLE NEEDS AN ALTERNATOR REPAIR AT YOUR GMC DEALER BATTERY LIGHT GOES ON The battery light is a good indication that something has gone wrong with your charging system. Chevy and GM Battery Current Sensor on Amazon: htt Mar 15, 2018 · My 2007 Classic Silverado has over harged since new. 46v while off. Oct 24, 2025 · The 2015 GMC Sierra 1500 has had some issues with the air conditioning compressor, which might fail and lead to cooling problems. If you’re facing the frustrating situation of “why is my GMC Sierra 1500 not starting,” don’t panic! This comprehensive guide will walk you through the most common causes and provide step -by- step troubleshooting tips to get your truck back on the road. 2 to 15. Original battery was changed about a year prior, I got a Interstate battery as replacement. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Dec 12, 2021 · Your GMC Duramax’s charging system is crucial to its functionality. Last week I installed a new AGM battery. I believe there is a recall out there to fix this where the dealership can load in a new firmware into the BCM. Apr 25, 2025 · Remember that simple fixes can sometimes solve what seems like a major problem. I thought the Why does the alternator fuse blow in the Sierra? The most common reasons for the alternator fuse blowing are: Short circuit in the wiring: a short circuit in the cables connecting the alternator to the battery or other electrical components can cause excessive current flow, which makes the fuse blow to protect the system. In the meantime, I will continue to troubleshoot and take readings. The video is applicable to the 14, 15, 16, 17, 19, Chevy Silverado. Mar 9, 2020 · I hope someone here can help me out. Jan 5, 2023 · I have a 2016 GMC Yukon XL and at about 150,000 miles it started having wonky electrical issues. Had the alternator replaced once a d still over charges. Aug 9, 2021 · If the voltage does not change when the engine is started, if it does not get above 13 volts, or if it charges above 15 volts then the alternator may be faulty. That said I have had the truck for 4 weeks and it keeps blowing the voltage regulator on the alternator. If your Sierra’s battery or alternator light came on while driving the last time it ran, and now it won’t start, that’s a strong indication that your truck’s alternator couldn’t charge the battery enough. Read the complete details: what they cover and the recommended solutions. I would park in the driveway and when I get out it would loose all power, no lights or power anywhere. Keeping these points clean and well-maintained ensures a stable and efficient electrical system. 99Link to part: https://www. Battery tested as needing charge, and alternator as high voltage. Feb 25, 2018 · I have to replace my alternator because of a bad voltage regulator. I just replaced the batteries my third set since new. Between upgraded plow lights, the oversized v plow, wipers and heat going the alternator doesn't seem happy. Brought truck back to dealer with intermittent problem with voltage drop on 2014 Silverado after 2500 miles. It just clicks a bunch when i turn the key. Note any codes that indicate problems with the battery, alternator, or electrical Jan 27, 2015 · Has anyone experienced battery voltage drop on a 2014 Silverado. I went 16 miles. Context is concern I'm overcharging my AGM battery (actually a 2nd auxiliary battery), since I'm seeing upto 15. Yesterday, my voltmeter showed about 9 volts. I noticed that there would be an occasional dimming of the headlights for second or two. In this video, we'll discuss an alternator problem that Chevy Sierra owners might encounter and offer helpful tips for diagnosing and fixing them. Has anyone heard if GM has come up with a fix for this issue yet. But at highway speed it would not charge the battery and keep up with the load of headlights at night (I was running an aircraft landing light in one of the high beams). Truck has NEVER done this before. Many typical concerns, like the alternator or battery , can, nevertheless, have an impact on the charging system and Issues with the charging system must be addressed as soon as they’re discovered, or you risk being stranded with a car that refuses to start. Jun 27, 2022 · GMC Sierra 1500 – (dennizn / Shutterstock) The most common cause for auto windows not working in GMC Sierra 1500 is when the 12 volt battery has been replaced or disconnected. Jan 7, 2021 · Hey everyone, I'm new to the forum and this is first for me so please bare with me for the long post. Based on the data from the current sensor and the charging conditions listed below, the body control module (BCM) determines the best charging routine. It not only powers all the electrical components in the vehicle, but also charges the battery when the engine is running. Your GMC dealer can easily tackle any repair that your alternator needs, so it’s important to visit the dealership ASAP if you notice any of the signs below. 3 and 4x4. 6-14. My voltmeter has always been just a tad above the 14 volt line. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! And she had an ea in this video I show the steps and procedures necessary to replace and diagnose alternator on a Chevy Silverado. The check engine light came on throwing code p0305 which is a misfire in cylinder 5. But before replacing the battery, you should rule out any other problems that may cause the dead battery symptoms, e. Sep 12, 2023 · Put in a new HO alternator in the Sierra about a year ago, not long after I upgraded to dual e-fans. 4 with a volt meter. Affiliate link to the alternator I bought bellow. Those will definitely cause a battery to drain if they are plugged 24/7 do you have to jump start it every now and then? Alternator Replacement 2015-2020 Yukon, Tahoe, Suburban, Sierra, Silverado, Escalade 6. Symptoms starting last week (out of nowhere) my Silverado did not start. While this can be a frustrating issue, it’s important to note that not all vehicles experience this problem, and overall, the Sierra 1500 is generally considered a reliable truck. 1K subscribers Subscribe Find out how to diagnose the problem behind your Chevy or GMC "Service Battery Charging System" message and learn practical tips for fixing each issue. just put a system in "small system by what i see on these forums lol" The problem im having is that the computer controlled charging system constantly shuts the alternator off Dec 13, 2019 · LML Charging 2015 CHEVROLET SILVERADO/GMC SIERRA ELECTRICAL SECTION 77 / 896 Description and Operation Charging System Description and Operation Electrical Power Management Overview The electrical power management system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. If your truck has a problem, you'll get a warning message on the dash. The GMC Sierra has an alternator that sends electrical current to various devices in the vehicle while the engine is running. At the battery its 15. 6V on multimeter and needle looks like this: 80K miles. Alternat In the video, LiveFast shows how to remove and replace a dead or weak alternator. Get Yours Today! We have the best products at the right price. Mar 14, 2025 · I have a 2015 Silverado and my service battery charging system light has been coming on randomly. Jul 30, 2021 · It’s not normal for the battery light, and check charge system on a 2015 Silverado ehh? The weird thing is, if I disconnect the negative battery terminal at the battery and reconnect, my charge system (alternator) functions fine for about a hour or two. bad alternator, loose battery connection, or poor ground connection. After some research I removed and cleaned the negative battery cable grounding point (behind the passenger side front wheel Got a call from a Gentleman asking if we could come to the Aldi's in Baraboo and jump-start his 2014 GMC Sierra after we ran a test and jump start on it found out that it was a bad alternator so Sep 13, 2018 · GM says this problem is related to the same electrical issue that led the automaker to recall 690,685 of its 2014 Chevrolet Silverado and GMC Sierra trucks in August 2017. These are some of the signs to watch for that you need an alternator repair. I started to notice the starter was taking a moment to crank over from cold starts Jul 22, 2022 · New Circuit/System Testing for Parasitic Draws December 21, 2020 Components most likely to cause a parasitic draw on the 12V battery on GM models include switches, relays, LIN buses and control modules. Feb 21, 2025 · Hey Chevy and GMC owners, We know how frustrating it can be when your infotainment screen suddenly stops working—whether it's unresponsive, stuck with "ghost touch" symptoms, or worse, completely black. Dec 13, 2019 · I to have a charging problem on my 2015 2500 diesel, replaced the alternator, same issue, after initial start up it doesn't charge stays at 12v until I drive just around a mile, then the Guage shoots up to 14 v , then after that it charges, next morning same symptoms, go figure pcm or bcm ? Nov 11, 2024 · I have a 2015 Chevrolet Silverado 1500 2WD 5. What the system is doing is when you first start the engine, the starter has drawn a lot of power out of the battery, the alternator is commanded to run at a higher power to get the battery charged up, that is why you always see 15 volts right after a start. Get Your GMC back on the Road with Phillips Buick GMC Oct 19, 2011 · 2005-2008 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe 2005-2008 GMC Sierra, Sierra Classic, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL with Regulated Voltage Control (RVC) The following diagnosis might be helpful if the vehicle exhibits the symptom (s) described in this PI. 3V on occasion, and AGM max is recommended 14. Jul 30, 2021 · Find out what an alternator fuse is, signs and symptoms of a bad alternator, how to change a blown fuse, and other related FAQs. 5 volts. Then suddenly the battery light comes back on, and says to service charging system. GMC Sierra 1500 fifth generation – (photo by GMC) The most common causes that hinders normal starting Feb 2, 2014 · 2010 GMC Sierra CC SB 4X4 Cognito 6" lift and 315/70/17 ATP Tuned!! 2008 GMC Sierra Crew Cab 4X4 (wifes) Zone lift set close to 4" 305/70/17's Hankook Dyna Pro RF-10 ATM Jul 3, 2013 · When I picked up my 05 sierra the voltage jumped from 12-14 all day long. 7. I think you're battery and alternator are good and you have another problem, especially since the DIC and CEL are not saying anything. I have a new die hard and its getting a good charge and battery cables are tight. 0l. otvdpq kdupi kooi hgggyts kjwyi uam jvvdo tftec xanwqlkx byqaah qaqpb jjbgshm gcgp mjhsb tbyua