2021 Chevrolet Tahoe: multiple warning lights

Filed Oct 28, 2026 · Engine · VA

Driving on the highway when all lights lit up on the dashboard. Car slowed down immediately following alert notifications. Towed to dealer. Was told I needed Camshaft and both banks of lifters all head bolts and head gaskets (W) [Other]: Camshaft actuator and bolt and chain tensioner

Filed May 29, 2026 · Engine · MN

My wife was stopped at a stop light traveling west from and appointment. When the light turned green she moved her foot from the brake to gas when all of the warning lights. It happened at the worst time possible during rush hour and we were fortunate that she was not hit by traffic. After the police arrived to help re direct traffic and wait for a tow truck, we found coolant spilling underneath the engine towards the rear of it. Towed to local repair shop, they inspected and found the engine had a catastrophic failure. Likely related to the current recall for the 6.2l V8 engine installed in this Tahoe.

Filed May 11, 2026 · Brakes, Driver assistance · 78,026 miles · IN

The contact owns a 2021 Chevrolet Tahoe. The contact stated while driving at an undisclosed speed, the contact stated that several warning lights illuminated. The vehicle was towed to the dealer where it was diagnosed with a failed engine, lane departure modular and the brake master cylinder. The contact was informed that the engine, lane departure modular and the brake master cylinder needed to be replaced. The vehicle was not repaired. The contact was informed that the lane departure module was in back order. The manufacturer was made aware of the failure and a case was filed. The contact was advised to contact the federal safety agency Hotline and report the failure. The failure mileage was approximately 78,026.

Filed Feb 15, 2026 · Engine · CO

While driving home late at night, the vehicle experienced a sudden mechanical failure in the engine. I was traveling approximately 2 miles per hour while slowing to stop at a stop sign when there was a loud “clunk,” followed by an abrupt stop of the vehicle. Immediately after this occurred, multiple dashboard warning lights illuminated, and a knocking sound began coming from the engine. The vehicle is currently not operating normally and is available for inspection upon request. This incident occurred late at night while I was driving with my two young children in the vehicle. The sudden and unexpected stop put us at risk of being rear-ended or stranded in an unsafe location. The loss of normal vehicle operation created a dangerous situation, especially given the time of night, location, and the presence of my children. There were no warning lights, messages, or noticeable symptoms prior to the incident. All warning lights illuminated only after the loud clunk and abrupt stop occurred. The knocking sound from the engine began immediately following the failure. I now am in a rental car that costs $700 a week that my insurance doesn’t cover.

Filed Jul 16, 2025 · Electrical, Engine · FL

On 01/03/24, the vehicle stalled and smoked on the Suncoast Parkway. All dashboard warning lights and messages illuminated, and the vehicle entered emergency park mode. OnStar was contacted and the vehicle was towed to Jenkins Chevrolet in Homosassa, FL. The failure was linked to a broken pulley and belt system that damaged the ECM and wiring harness. No DTCs were pulled, and mileage in/out was 80042/80043—no test drive performed. On 08/06/24, the vehicle returned to Jenkins for a roaring noise. A pulley bearing was replaced, possibly related to the earlier failure. Again, no drivability evaluation or codes recorded. On 03/09/25, the same full system warning lights/messages appeared again. The vehicle experienced harsh shifting and delayed acceleration. It was taken to AutoNation Chevrolet South Clearwater on 03/10/25. DTCs (P0700, P0717, P2714, P2716, P0706, and U-codes) were found but dismissed. Only the battery was replaced. Mileage in/out was 99494—no test drive performed despite claims one occurred. On 07/08/25, the vehicle again showed full dashboard warnings. Brought back to AutoNation on 07/09/25. On 07/14/25, customer received a $9,177.85 estimate including full transmission replacement. Safety was at risk due to repeated stalling, loss of acceleration, and emergency parking mode while driving or merging. These failures could have led to accidents or left the vehicle disabled in traffic. Driver and children were present during each incident. The vehicle is enrolled in OnStar and the MyChevy app, which provide monthly health reports. Despite these incidents, no faults or warnings were ever shown in the reports. Vehicle remains available for inspection. A case is open with GM. Across 4 service visits, GM-certified dealerships failed to follow proper protocols, including code checks, drivability assessments, and test drives—contributing to delayed diagnosis of transmission failure.

Filed Jun 12, 2025 · Engine · NC

While starting from a stop the engine stuttered and resulted in a major loss of power. Luckily this occurred pulling out of our driveway on to a quiet neighborhood street. Several warning lights and messages went off including the engine and transmission system warning, “service ESC”, “Service Traction Control”, and the emission system warning. After driving it to the dealership at 30mph since the shaking and banging noise was so bad, the dealer diagnosed it as a cylinder 6 caused by a failed lifter and lifter rod. Resulting repair involved lifters and rods in that same bank at a $3500 repair. The vehicle was just over 4 years old with 79,250 miles.Repair invoice available upon request.

Filed Jun 4, 2025 · Electrical, Fuel system · CA

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