2021 Chevrolet Tahoe Electrical System Problems

During highway driving, alert on dashboard stated “electrical system failing enter idle mode”. Tahoe slowed down and then engine began knocking right as it shut off resulting in needing to coast to the shoulder of the highway safely since engine was off. Towed to dealership and then they came back saying needed a new battery, new alternator belt, pulley and water compartment. After those installed, additional call was made indicating the engine needed a full replacement as it keeps overheating despite no sensor alerts and codes are being tripped. Here we are asked to pay 16K for new engine install and unable to fix.

The backup camera quit working

Since March of 2025 I have identified a critical safety defect with my vehicle. When driving and without warning, the vehicle unexpectedly shifts to neutral, experiences a loss of propulsion, and the engine shuts off. This has occurred multiple times in which I narrowly escaped collisions with other vehicles or objects. If this would occur at a high rate of speed, it would certainly result in serious accident including possible fatality. I have experienced three near-accident scenarios when I had children in the vehicle. I have worked with Classic Chevrolet in Sugar Land, Texas who has made six attempts at repair. They have each time found a different component attribute to an error code and replaced that part. After each visit they tell me that the car is fixed and safe to drive. They have never been able to provide a clear explanation as to why I am experience this reoccurring issue, but attribute it to a different part each time. Within 5 days to 2 months, the incident repeats. I have recent video of the incident that I can share. Chevrolet Customer Care has been minimized my concern and informs me that their Service staff has found the vehicle to be fully operational and safe to operate. I have spent over $6,000 in failed repairs. I do not feel safe operating this vehicle. That list of repairs includes: March 7, 2025 - battery replacement March 28, 2025 - DC/DC power converter April 22, 2025 - ECM updates January 8, 2026 - •Throttle body replacement •Serpentine belt replacement •Engine air filter replacement •Transmission fluid flush •Coolant fluid flush •Fuel injection cleaning •Hydrogen carbon cleaning service January 23, 2026 - power control module (recall) January 30, 2026 - rear differential system replacement March 10, 2026 - • Replacement of the high-pressure fuel pump • Replacement of the DC power supply converter • Hydrogen carbon cleaning service I can share all invoices. Chevy is NOT TAKING THIS MATTER SERIOUSLY. Please support

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at an undisclosed speed, there was a breach in communication with the OnStar system. The contact believed that the brakes failed, and several other safety systems became inoperable due to a failure with the OnStar system. The dealer was notified of the failure, but the vehicle was not diagnosed or repaired. The manufacturer was notified of the issue. The failure mileage was 114,000.

The sound in my entire truck goes in and out. Even my blinker signal does not make sound and I have to look down to ensure my blinker is on which could lead to an accident.

My truck was driving perfect and I went to pull into a parking lot in Arkansas where I live in long story short it started acting funny trying to idle out and then I heard a knocking noise. It happened twice. Then my service ESV light come on next my motor light come on then my auto for a collision system failure light come on. It’s on the dash anyway my vehicle is not running around. It has hardly no power and I smell something under the hood from time to time burning it’s kinda like an electrical smell. I’m not sure. I’m not a mechanic. I’m a [XXX]. I’m a [XXX]!!! but I have to have a way back back-and-forth to work and I cannot drive this vehicle. I have been driving it to work and just straight to home and that’s only like a mile from the shop but I need a replacement vehicle I need to sell mine at wholesale value as you guys said you would that would be greatly appreciated. God bless you guys. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle taken into dealership for maintenance, after car received cars system software malfunctioned. Display screen went black and states "return to dealer. failed update" due to this issue I don't have access to car settings with most features are unavailable. All warning chimes such as turn signals, park sensor warnings, lane departure warning are inoperable. Had drove miles with turn signal on causing traffic disruption on neighboring lanes.

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving 20 MPH into the driveway, the engine seized. The contact stated that the service traction, service ESC, and engine warning lights were illuminated. Upon research, the contact associated the failure with NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The vehicle was towed to the local dealer, where it was diagnosed, and DTC: P0300, P050D, and P0302 were retrieved. The vehicle was not repaired. The manufacturer was notified of the issue and offered to help with the cost of the repair. The approximate failure mileage was 64,572.

When driving the car just stops losing power then the car immediately shuts down and stops driving. I had to call a tow truck when it’s taken to the dealership the fuel pump power control module is faulty. This is a 2021 Tahoe they had to replace the fuel pump, power control module, and this vehicle should not have to be replaced. Chevrolet/GMC knows that these modules will make the vehicle stop wherever it is driving. I happen to be on a freeway going 70 mph and could have been killed. They have not put a recall out to have these modules replaced in any SUV. This is a danger for any driver on the road. This is a lawsuit waiting to happen for people. You know that they are aware this is happening because they paid for the tow and replaced this part that is not warranty now for free. Yes, great that it was paid for but thankful I did not lose my life as I could’ve been rear ended when my car shut down going that fast in the middle of the freeway I am begging that they please put a recall so no one gets injured or killed.

To Whom It May Concern, I am writing to formally report serious defects with my 2021 Chevrolet Tahoe (VIN: [XXX] ) and to request assistance with repair costs. Approximately six months after purchase, when the vehicle had about 22,000 miles (I bought it used with around 19,000 miles), the battery and electrical system failed. I brought it to the dealer and was told there was no issue; they only performed a jump start. Two days later, the vehicle broke down in the middle of the road. I had to pay for a tow truck and replace the battery completely out of pocket. More recently, at about 92,000 miles, the vehicle developed severe engine problems. A certified mechanic diagnosed collapsed AFM lifters and camshaft damage. The repair requires OEM GM parts and costs approximately $4,500. This issue is widely reported by other GM owners with 5.3L AFM engines and is known to be a manufacturing defect, not a maintenance problem. Please note that my Tahoe has been well maintained, with oil changes always performed on time and using the correct oil and service intervals recommended by GM. Despite this, the vehicle has experienced repeated and costly failures that create unsafe driving conditions. I kindly request that GM review my case and provide assistance with covering the repair costs or reimbursement, given that these issues are the result of known defects and not owner neglect. I look forward to your prompt response. Sincerely, [XXX] [XXX] 33032 [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

2021 Chevrolet Tahoe original owner. Fuel control module failures. 1. Failed on 6/29/21 at 5,068 miles. Dealer replaced with GM Part #13537053. 2. Failed on 8/15/22 at 12,130 miles. Dealer replaced with GM Part #13544060 3. Failed on 8/1/25 at 41,247 miles. Dealer replaced with GM Part #13554821 On each failure, vehicle was unable to shift to neutral, power remained on, electrical component began shutting down to conserve power, left stranded and required towing with rear wheels being dragged locked up onto tow truck. Once power was shut down, could not operate windows or lock doors other than keyed driver's door. Th entire failure mechanism puts the driver in an extremely unsafe situation. Recall notice #21V739000 was issued on 9/23/21 with to impacted notified owners on 10/14/21. Did not receive this notification since first failure was prior to recall and assume GM considered vehicle repair completed. Note that the fuel module part number has changed 3 times in my case, but Part # 3554821 replaces 5 other listed part numbers. Is this the 6th iteration or of this part? What is the root cause of the fuel module failure? Is it the module itself failing or an electrical issue that causes the fuel module to short out and fail. GM/Chevrolet is not solving this issue. With 3 failures of the same component, this is a lemon and I have no comfort or confidence using this vehicle. When will the next failure occur and what unsafe situation will this leave me stranded in? Read this issue applied to 2021 and 2022 GM full size SUV's and now reading issues through the 2024's. Unacceptable and poor quality. GM needs to be held accountable to solve the root cause of these failures and stop putting a replacement band aid on the problem.

Car stopped while in motion, engine shutdown and could not be put into neutral to move vehicle out of traffic. Car had to be towed away. Only 37 k miles. This is the Second time this has happened in traffic posing a major safety hazard. Fuel control module was what shut down the car while driving the first time. Now it has failed again

Failed OTA Update to information center (Radio) has caused radio unit and screen to become inoperable. Blinkers do not sound when on, warning sounds when backup camera are in use no longer work, along with cross traffic warning due to this. It should be noted we did not consent to the OTA update, and would have not wanted the update as it has caused damage to this system. GM know this is an issue and has refused to fix this.

Instrument panel has failed twice and is unresponsive. The gauges move and stay to the left after moving left to right. All lights begin to cycle through error messages. I have video of the issue both times it happened. When it occurs, you don't know your speed you have to guess, the full tank reads empty etc., and it is dangerous to back up. The vehicle has been diagnosed by one independent mechanic and is currently at the dealership. There was no warning before the instrument cluster failed other than a cycling through of warning messages service transmission check 4X4, service suspension system, service Power Steering Drive with care. -The center screen goes in and out. -When in reverse, the rear camera is black, the screen blinks intermittently. - Dealer has stated that the wires are put on incorrectly- if that is the case, I am not sure who would have done that other than the manufacturer. -previously reported there was a strong gasoline smell in the cabin that made it really hard to breathe. Dealer corrected. Right passenger side is intermittently wet with no cause from the interior creating stale smells, making it hard to breathe. It is important to note this is the side where the electrical wires are "put in incorrectly" according to the dealer. I also have a video of what occurs

Truck want go over 62 miles heater comes on full blast truck reduces speed while drive and transmission want shift 4wd error comes on service climate system comes on the power steering error comes on the service esc and washer fluid system error comes on it seems like an electrical manufacture error with the truck

We are apart of the safety recall with the potential brake and engine issues, we have contacted the dealership and they have NO remedy at the current time for our defective vehicle. We contacted GM to request a buy-back due to the safety issues with the vehicle, told we did not qualify BUT they have no remedy for our defective truck. We do not fell safe in the vehicle, the brakes are sticking and the engine is making weird noises. We are currently seeking legal representation because we are being forced to drive around our family of 5 in an unsafe vehicle with NO remedy or option to trade it in.

Info center with radio, vehicle info, on star keeps going black screen. When this happens I loose all control of info center and on star goes out where no location would be available if the vehicle was in an accident. This is safety concern because with no automatic notifications of accident no one would know if vehicle was in an accident. The vehicle has been to dealer 4 times for this problem since February of this year. Each time the dealer says it needs another update each time. GM is having this issue with many of the Vehicles like this Tahoe. On Star is also aware of the issue too. GM knows there's an issue but now they are saying I have to pay for an update because I am out of my extended warranty even though this has been an ongoing problem which started when I was in warranty. This has to be a programming issue that they need to fix. The vehicle has to be shut off for up to an hour for screen and controls to come back on which is safety issue because no way to change any settings for vehicle and safety backup because of no on star.

On 2 occasions the dash lights and gauges do not turn on when the vehicle is on. The first time this happened I was driving and was no longer able to see my speed or any other details provided by the gauges. We changed the fuse and it seemed to work for 1 day. The next day I turned the vehicle on, was able to drive but none of the dash features were functioning again. Will be taking to dealership when available scheduling to have it evaluated.

Vehicle brake module system failed after being replaced one week ago. All of my systems system lights are coming on on my dashboard. I cannot drive past 62 mph. This is the second time that this has happened under a month after vehicle being serviced at a GM dealership.

My vehicle performed an update without my knowledge. When I got back into my vehicle after a quick stop the infotainment system said "Update Failed - Return to Dealer". I did so and was informed that a reprogram was attempted but failed so the entire system needed replaced. There is active recalls I'm told on newer model vehicles with the same issue but mine is not included. So, after the OTA update I didn't ask to take place I'm stuck paying $1,300 for a new infotainment system. I called GM who basically told me without there being a recall there was nothing they could do.