2021 Chevrolet Suburban electrical problems

Filed Oct 27, 2026 · Electrical, Engine · NC

Failing coolant flow control valve. This is a known issue affecting the same engine and model year and VIN is not covered. This is ridiculous.

Filed Sep 22, 2026 · Electrical · 68,448 miles · IN

The contact owns a 2021 Chevrolet Suburban. The contact stated that while driving 20 MPH, the radio display screen was blank. Additionally, the vehicle turned on and off independently, the doors locked and unlocked independently, and the liftgate closed independently. The contact stated that the power running board failed to operate as needed and failed to activate on the front driver’s and passenger’s sides of the vehicle. The failure had occurred on several occasions. A dealer was contacted. The vehicle was towed to the dealer, where it was diagnosed and determined that the battery needed to be replaced. The approximate failure mileage was 68,448.

Filed Sep 15, 2026 · Electrical · OR

The radio control unit that controls all the interior features of the car failed due to an over the air update. We can no longer use the radio, gps, hot and cold on the screen or what the rear climate is at, there is no sounds from any of the blinkers or emergency lights.

Filed Apr 4, 2026 · Electrical · OK

Had an engine replacement in dec of 2025 and had to pay for it since wasn’t under warranty or recall. And now my replacement engine which has a warranty now. Just failed in March 2026 which about 3 months later. Had metal shavings in engine and multiple cylinders misfiring. And now I don’t have a family vehicle to drive my family around again. There should’ve been a recall on my engine, but wasn’t this is not fair. And I’m paying the price for it.

Filed Mar 20, 2026 · Electrical, Steering · NE

I am submitting this complaint to report a serious safety issue involving my 2021 Chevrolet Suburban equipped with the 3.0L Duramax diesel engine. The vehicle has experienced a recurring problem related to the engine wiring harness. While driving, the vehicle will unexpectedly stall without warning. At the same time, there is an immediate loss of power steering assist, significantly reducing the ability to safely control the vehicle. This creates a dangerous situation, especially at highway speeds or in traffic. The failure appears to be linked to a defect or malfunction in the engine wiring harness, which may be causing intermittent electrical interruptions to critical engine systems. There were no prior warning signs sufficient to prevent the incident. This issue poses a substantial safety risk not only to the driver and passengers but also to other motorists. Sudden engine shutdown combined with loss of steering assist increases the likelihood of a crash. I believe this may be a systemic defect affecting other vehicles of the same model and configuration. I urge the federal safety agency to investigate this issue and determine whether a recall should be issued. Vehicle Information: Make: Chevrolet Model: Suburban Year: 2021 Engine: 3.0L Duramax Diesel

Filed Feb 18, 2026 · Electrical, Fuel system · 35,000 miles · OH

The contact owns a 2021 Chevrolet Suburban. The contact stated that while driving 45 MPH, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended, and the vehicle decelerated unintendedly. Additionally, the vehicle failed to exceed 42 MPH. Later in the day, the gear shifter was shifted to reverse; however, the vehicle failed to reverse as intended. The vehicle was taken to the dealer, where it was diagnosed with transmission valve body failure. The contact was informed that the transmission valve body needed to be replaced. The vehicle was repaired. The contact stated that the vehicle was at the dealer from December 2024 until June 2025. The vehicle was picked up from the dealer. The contact stated that while driving at an undisclosed speed, the engine seized and failed to restart. The vehicle was towed back to the dealer, where the contact was informed that the fuel pump had failed, and the battery was drained. The contact was informed that the battery and the fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 35,000.

Filed Nov 30, 2025 · Brakes, Electrical · TX · fire · 4 injuries

The vehicle caught on fire in our garage The Vehicle had been parked outside than moved into the garage nothing smelled like smoke after it was parked other than the exhaust after I got out of my suburban I have a good idea what caused this but until its done being ispected I happened to look back and saw a flame in the Suburban coming from the center area of the dash on the right hand side of the divers seat I thought for sure it was gonna blow up the dogs were in the back of the garage behind the vehicle off to the side I started screaming and calling for help and had to go around the house to the front door to get my husband and him and one of my sons went out there why I called 911 and was with my other son whom has a disability and they told us to get out of the house and I could not get back to the garage we were on the other side of the house going to go out on the patio my other son and husband were in the garage trying to put it out and getting to the two dogs my son went through the smoke to reach the dogs were one ran out on her own and the young German shorthair was in shock and he had to carry the 2 year old out and put them in a safe place but my husband was still trying to put out the fire he hooked his pick up to the suburban to try to pull it out of the garage and it moved maybe a few inches he was stuffing wet towels on it also to try to stop it nothing worked the fire dept showed up and police after having to tear the inside of the front of the dash out our home owners insurance adjuster was out yesterday The Suburban has had multiple and thousands of dollars of mechanical issues even Gm putting a new engine in it after only a year in a half of owning it fluid got pushed up into the wiring after a service last year there was splater inside the dash glass after a new steering wheel was istalled and I asked the dealer if they could fix that and they said that they didn't go inside there the amount of detail that has led up to this is huge

Filed Jul 28, 2025 · Electrical · NJ

After a major HVAC repair involving the evaporator core (performed at a Chevrolet dealership), my vehicle began experiencing serious electrical issues. The second-row 12V outlet no longer functions, and the vehicle has gone completely dead three times while the engine was off due to the auto stop/start system — once while stationary on a major highway, creating a dangerous situation. Each time, the engine failed to restart automatically, and the entire electrical system became unresponsive.

Filed May 19, 2025 · Electrical, Seat belts · NV

Sat may 3rd We went for tire change from that date since that day, every time we try to start the car there’s always a different warning light The warning light is never the same issue. On may 15 when we received a warning light about transmission we went to the dealership that day they said they were about two weeks backed up but flushed the transmission and paid $504 for the service. Since that day we also received numerous warning light which include. Driver window. Esc. Winshield fluid. Tire pressure. Lift gate open. Forward Collision System Unavailable. Your 2021 Chevrolet Suburban detects a battery, starter or connection issue. Lastly the check engine light came on and the car won’t start.

Filed May 13, 2025 · Electrical, Engine · CO

I am contacting you regarding a critical engine failure in my 2021 Chevrolet Suburban LT, which is equipped with the L84 5.3L V8 engine. Due to a valve lifter malfunction, the engine suffered catastrophic failure, with metal shavings found throughout the oil system and internal components. I’ve been quoted approximately $14,000 by the dealership/service center to replace the engine, and the vehicle is currently awaiting repair. I was driving the car with my son when the vehicle began to shake, make ticking noises, and the check engine light went on. I pulled off the road and several error codes popped up including "Service ESC" and "Service Traction Control." This is the second time that a lifter valve has failed on this vehicle. In 2022, the lifter valves on the left side were replaced under warranty. It appears one of the left side lifter valves failed again, this time causing significant cam shaft damage and damaging the engine. Given that this issue appears to be affecting many owners with similar engine configurations, I would appreciate your assistance in investigating this matter to see if these issues stem from possible manufacturing defects which could result in engine damage or failure. I reached out to General Motors to ask if I qualify for extended coverage or any known service programs to address this situation and they told me I should talk to the dealership because they are unwilling to offer assistance. I've attached receipts for repair of the lifter valve in 2022 and the current diagnosis of engine failure, cam shaft damage, and lifter valve failure. This vehicle is only four years old and was regularly serviced by General Motors. It is available for further inspection. Please let me know what other documentation or information you require. Thank you.