Chevrolet Trailblazer Complaints (2021)

198 consumer complaints on file.

#11748172July 3, 2026
UNKNOWN OR OTHER
Due to the Front view camera module going bad, I have no access my ADAS.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11747213June 29, 2026
UNKNOWN OR OTHER
Shift assembly kit, it is available. Dealership has to order part for inspection. Still passed inspection. Possible unintended rollaway accidents. Not being able to lock the vehicle as well. Yes, it’s been confirmed. There’s also so many class action lawsuits against GM about this matter. Why isn’t there a recall already?! Getting the “shift to park” message in my vehicle for the 2nd time now in less than 4 years. The shift assembly kit was replaced back in December 2022. Apparently it needs to be replaced again because of a switch.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745155June 18, 2026
ELECTRICAL SYSTEM
My 2021 chevy trailblazer rs is experiencing issues with the infotainment system and the onstar module they have stopped working and I have no backup camera and this issue is a safety concern to me and anyone who rides with me i have contacted both gm and onstar and got nowhere with them after I had a diagnostic test done on 6/18/26 they recommended replacement of the whole system
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742562June 7, 2026
UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: WARNINGS
Dealership Linwood inspected vehicle and certified power and ground module has internal fault-faulty front camera module.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742380June 5, 2026
SERVICE BRAKES, ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
While driving on Thursday, June 4, 2026, the vehicle experienced a sudden and complete failure of the electronic braking/power brake assist system. Simultaneously, multiple safety warnings illuminated on the dashboard display, including a persistent service wrench icon, a traction control warning light, and a lane-keep assist indicator light. Due to the loss of brake assistance, the vehicle was unsafe to operate and had to be towed/driven directly to a licensed dealership for emergency diagnosis. The dealership technicians subsequently inspected the vehicle and reported that the entire electronic braking system had suffered a total failure and is completely non-functional. Despite multiple technical service bulletins and recalls issued for similar vehicle builds regarding electronic brake boost interruptions and mechanical brake vacuum pump failures, I am being forced to pay for these critical safety repairs out of pocket. A sudden loss of braking power poses an immediate crash hazard, and I am filing this report to urge the NHTSA to investigate why this manufacturing defect is not covered under an active safety recall for this specific vehicle configuration.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742150June 4, 2026
ELECTRICAL SYSTEM
Amplifier lost connection, so speakers won’t work, collision warning won’t sound, and turn signal won’t sound.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738187May 15, 2026
UNKNOWN OR OTHER
I needed to have my muffler welded in November to pass inspection. I was told I would likely need the entire thing replaced in a year. I now hear another exhaust leak, and I’m preparing for a hefty car travel and have to deal with trying to get it fixed in 10 days time. This is ridiculous on a 5 year old car that I have only had two year. This needs to be a recall, insane to have to pay for a whole replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11736470May 8, 2026
UNKNOWN OR OTHER, ELECTRICAL SYSTEM
Intermittently I will receive a dashboard message reading “shift to park” after I park the vehicle and do shift to park. This is a known issue with this vehicle across several years identified as “a known issue caused by a faulty switch in the shifter assembly failing to detect when the car is in Park”. GM has identified and found a solution to this problem by replacing the entire shifter assembly at the owners own cost. This malfunction has the potential to cause great harm. Potentially the vehicle could roll if the engine/system does not identify that it is in park. This could cause very expensive damages or even take a life. The vehicle also remains in accessory mode which drains the battery and can become even more costly for the owner at no fault of their own.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734601April 29, 2026
ELECTRICAL SYSTEM, SERVICE BRAKES, HYDRAULIC
The contact owns a 2021 Chevrolet Trailblazer. The contact stated that while driving approximately 40 MPH, the vehicle stalled. During the failure, several unknown warning lights illuminated, and the vehicle was jump-started. The Auto START/STOP function was disabled for the vehicle to operate properly. The vehicle was inspected by an independent mechanic; however, the failure could not be duplicated. The contact replaced the battery, and the failure was almost resolved. Additionally, while depressing the brake pedal, the vehicle failed to stop as needed. The issue was not diagnosed or repaired. The contact stated that while starting the vehicle, the RPM was abnormally elevated, and the vehicle jerked abnormally while shifting gears. The manufacturer was not notified of the failure. The vehicle was not diagnosed or repaired. The approximate failure mileage was 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734472April 29, 2026
POWER TRAIN
I am reporting a serious safety issue with my 2021 Chevrolet Trailblazer related to transmission failure. The vehicle has approximately 83,000 miles. While driving, the vehicle experiences a sudden loss of power when attempting to accelerate. In some instances, the vehicle has stalled or shut off while I was actively driving, creating a dangerous situation, especially when merging into traffic or driving through intersections. The issue is intermittent but has become more frequent over time. The vehicle does not respond properly when the accelerator is pressed, and there is a noticeable delay or complete lack of power. At times, the vehicle will not move as expected, which poses a significant safety risk. Diagnostic codes associated with this issue include P2714 and P0700, which indicate a transmission-related malfunction. I have been advised that the vehicle requires a full transmission replacement. This failure occurred at relatively low mileage for a major powertrain component, and I am concerned this may indicate a broader defect. The stalling and loss of power create a hazardous driving condition that could result in an accident. I am submitting this complaint to report a potential safety defect and to request further investigation into this issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11733143April 22, 2026
UNKNOWN OR OTHER
When I put my car in Park, my car fails to detect it is in Park, leading to a persistent error message that tells me “Shift to Park”, inability to turn off the engine, and battery drain. I’ve had the car since Oct. 2020 and this car has been doing this since at least Oct. 2021.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731922April 17, 2026
ENGINE
2021 Chevrolet Trailblazer RS (123,000) - Coolant control Valve failure Cooling issues after 20-25 mins of driving. No Check engine lights initially just temperature gauge climbing. After 3 day of trying to drive to and from work. "Engine reduced" and P3075 code. Had it towed to dealership, in which they replaced the water pump. This DID NOT fix the issue. The next two drives (from work, and to work), I had to pull off the road several times to get the car cooled down, and run heater on full blast to drop temperature. Pulling off the road in heavy interstate traffic consistently because of the Coolant Control Valve (25207464 GM). Not to mention me, looking at the temp gauge most of the way to work, versus eyes on the road. The old thermostats would at least give you a temperature code, and not an Engine Coolant Flow Too Low error which leads to water pump being replaced erroneously. Going to plastic control valve next to a hot engine, sounds as good as plastic car jacks for this car. Oh, wait, that happened to me as well, and they recalled it after it broke on me at 2 am in the morning.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731702April 16, 2026
ENGINE
While driving down the interstate my 2021 Chevy Trailblazer suddenly flashed "Battery Saver Mode" on the dash and shut off completely. I was able to coast to the side of the road and call for help. This was a MAJOR safety issue as my 4 year old son was riding with me and we could've caused or gotten into a serious accident. There were no previous warnings and no Check Engine Light came on prior to it shutting off--I had been having no issues. The car will not turn on and when attempting to, it makes a screeching noise. I had to get it towed to a local service center who stated my car has "catastrophic engine failure". They advised the issue could be either "timing chain or a dropped valve"--unable to confirm until they take the engine apart completely. They denied issues with the battery or starter and said the engine was completely blown. There was less than 120k miles on it and i kept up with maintenance.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731220April 14, 2026
UNKNOWN OR OTHER
When you put the vehicle in park, it does not register on the dash that the vehicle is in park so therefore you cannot turn the vehicle off. I’ve read this as well known in the 2021 trailblazers
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731055April 14, 2026
UNKNOWN OR OTHER
While driving at highway speeds, my vehicle suddenly enters low power/limp mode, severely reducing acceleration and creating a dangerous situation in traffic. This occurred multiple times. The dealership diagnosed the issue as a faulty gas pedal (accelerator) sensor and stated the vehicle is unsafe to drive under these conditions. The required part has been on back order for months, and no repair has been completed. The dealership promised a loaner vehicle due to safety concerns but failed to provide one and has had no communication for over four months. I am now required to travel long distances and fear loss of power will occur again while driving on the highway, posing a serious safety risk.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727889March 30, 2026
ENGINE
Coolant control valve replacement after 5 years of purchasing the vehicle. Put at risk of over heating while driving, fan stays on after vehicle is turned off. Problem confirmed by 2 dealerships. Check engine light on for a long time, fan over working, staying on after the vehicle is off. The only warnings were the engine light coming on to get inspected and fan over running. 1st came up in December 2025 and it is now almost April 2026 costing me $1600 in repairs!! There are other Chevy models that this looks like it is being covered for but my vehicle is having this issue now and is not being covered?!?? Ever since i bought this vehicle brand new in 2021 it was labeled a lemon and have had nothing but issue after issue after issue!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727149March 26, 2026
ENGINE
VEHICLE WAS TAKEN TO DEALERSHIP FEB 2026 FOR TURBO/WASTEGATE REPAIR (P0299). MARCH 22, 2026, VEHICLE STALLED AND SCREEN SAID TO SHIFT TO NEUTRAL AND PUSH TO START AGAIN. CAR WOULD CRANK BUT NOT START (SOUNDS LIKE THERE IS NO COMPRESSION). HAD VEHICHLE TOWED TWO MILES TO RESIDENCE AND CONNECTED TO OBDII SCANNER, WHICH SHOWED 6 NEW CODES (P0006, P228C, P0089, P0340, P0365, P0299).
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726811March 24, 2026
ELECTRICAL SYSTEM, ENGINE, SERVICE BRAKES
When stopped at a red light & the light turns green & I accelerate, the vehicle does not move. It makes a loud noise and jumps. This happens way too many times. There’s also an issue with the brakes, when you press on them, you can hear something grinding, which should not be happening because I bought the car brand new. Also the brakes have always been super squeaky, which is very frustrating because they should not be with a brand new car once again. The engine light goes on and off randomly and doesn’t say anything.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726763March 24, 2026
UNKNOWN OR OTHER
While driving on the highway, I heard a loud pop that made me flinch and swerve. After parking I noticed the glass in the sunroof had exploded upward like a volcano, leaving a large hole. Fortunately the shade was closed, or glass would have come into the car while I was driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11723367March 10, 2026
POWER TRAIN
My transmission is defective and past 60,000 miles but only a little. I had a diagnosis and it needs replacing like many of these trailblazers in the ongoing lawsuit. I cannot pay for it and it should not be broken!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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