Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2021 Chevrolet Tahoe owners, lightly cleaned up (personal details are redacted by NHTSA).
2 ISSUES - 1) vehicle repaired 5 times for "transmission" problem by replacing wiring harnesses. On 5th attempt, the GM factory part or the technician caused the Tahoe to catch fire. Worst part is that it happened 1 hour after test driving and parking the car at their dealership, thankfully, I would normally have driven it home and it would have destroyed my home too. GM investigated and was unable to determine cause. 2) each time the "transmission" error occurred the GM car went into what they call the "limp" mode. The car immediately loses speed control and drifts to about 35 mph until you have control of the accelerator. I was on an interstate going +70 mph to pass a semi and immediately after passing the car went into Limp Mode, the semi nearly rear ended me and then passed me blowing his horn and cursing me. …
The airbags failed to deploy in my 2021 Chevrolet Tahoe after being involved in an accident where another vehicle t-boned my vehicle on the passenger side front end to rear end causing severe damage and pushing my vehicle with great force. A police report was taken by officers that responded to the traffic accident. A claim was filed with my auto insurance and my 2021 Chevrolet Tahoe is currently being repaired as it was not deemed a total loss. Myself and my passengers were injured and received and continue receiving medical treatment for our injuries; our safety was definitely placed at risk. …
The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at approximately 35 MPH, he heard an abnormal sound coming from the front tires. The contact stated that the abnormal tire sound was constant and was occurring at various speeds. Additionally, the contact stated that the vehicle was occasionally failed to start. The contact stated that there was no starter motor sound or even the sound of clicking when the ignition key was turned. The contact stated that the failure was intermittent. The contact had taken the vehicle to a local dealer, where it was diagnosed; however, the failure could not be duplicated. The vehicle was not repaired. The contact stated that the failure had reoccurred. The manufacturer was informed of the failure. The failure mileage was 45,844.
The contact owns a 2021 Chevrolet Tahoe. The contact stated that the vehicle failed to start and was towed to the local dealer, who diagnosed that the fuel pump module was faulty and needed to be replaced. The fuel pump module was replaced, and the vehicle was repaired. After retrieving the vehicle, the message "Key Not Detected" was displayed, and the vehicle was taken back to the local dealer. The dealer performed a diagnostic test and determined that there were 14 separate electrical failures with the TCM, ECM, and BCM. The cause of the failures was not yet determined. The vehicle was not yet repaired. The manufacturer was not yet contacted. The failure mileage was 37,000.
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.
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 contact owns a 2021 Chevrolet Tahoe. The contact stated while driving at an undisclosed speed at night, the instrument cluster went blank. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 40,000.
We have owned this 2021 Chevrolet Tahoe for a little less than a year. Since acquiring this vehicle, there have been multiple safety recalls and we have had to get the vehicle serviced 3 times due to electrical issues. Now for the major safety issue, was out of town waiting at a red light in a turning lane. As we were waiting, the Tahoe spontaneously turned off. All of the indicator lights on the dashboard were illuminated and my husband tried to restart the car but the engine just kept turning and the car would not start. We put the hazard lights on and wanted to get the vehicle out of the road where there was active traffic. However, the vehicle was unable to be shifted to neutral so we were stuck and also important to note the hazard lights were not working. …
I purchased a 2021 Chevy Tahoe from Autonation Chevrolet 11-3-2020. I have taken my Tahoe to the service department numerous times - as my truck has had a stubborn service safety restraint system warning error code that continues to come on and off. I have taken it to have all recalls serviced as per recall request. The service safety restraint system warning code has not been corrected after more than 5-6 visits if not more as not all visits have been logged properly. I have had this truck for less than 12 months and have experienced too many conflicting issues. I do NOT feel safe driving my Tahoe with the SRS light on. There's obviously a malfunction that you all have not been able to figure out. This is extremely dangerous!! What if I were to get involved in an accident or collision and my airbags do not deploy? …
We were driving down the road and as I tried to accelerate the car would not go. Then I realized the car said push to start. My husband tried to push the neutral button and told me to restart it but I said you have to push the brake. All this is happening as we are coasting down a main road with speed limits of 55mph and my family is in the vehicle (including 2 toddlers in the back seat). Once we coast to a gravel area off the road I push the brakes and try to restart. My dash goes all black and I try to restart. It tells me battery low push to start. The starter engages and stays engaged until I push the start button again to turn off. The screen tells me it is shutting down functions to save battery. The check engine light is on. We tried 3x with same results. Finally we get out and my parents come to us. …
Electrical complaints in other Tahoe years
Frequently asked questions
How common are electrical problems on the 2021 Chevrolet Tahoe?
NHTSA has 57 complaints about the electrical system of the 2021 Chevrolet Tahoe, 12% of the model year's 459 complaints. The component named most often is instrument cluster/panel (1 mentions).
Is there a recall for 2021 Chevrolet Tahoe electrical problems?
No. NHTSA lists no electrical system recall for the 2021 Chevrolet Tahoe, though it has 16 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2021 Chevrolet Tahoe electrical problems start?
Half of the complaints with a recorded mileage happened before about 37,000 miles, and 44% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 2 fires and 3 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.