Chevrolet Trailblazer Complaints (2021)

190 consumer complaints on file.

#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
#11722954March 9, 2026
SERVICE BRAKES, HYDRAULIC
The contact owns a 2021 Chevrolet Trailblazer. The contact stated that while driving approximately 70 MPH, the brakes became inoperative. The message "Brake Failure - Speed Reduced to 53 MPH – Service Required" was displayed on the instrument panel. The vehicle was taken to a dealer; however, the dealer stated that the vehicle could not be diagnosed because diagnostic tests were available only by appointment. The dealer informed the contact that the computer software needed to be reset to drive the vehicle back to the residence. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and provided the contact information about a recall; however, the VIN was not under recall. The failure mileage was approximately 135,884.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11722752March 7, 2026
ENGINE
I was driving an hour away from home and suddenly my muffler and exhaust started dragging— 49,000 miles, 5 years old AND just passed inspection A WEEK AGO. Luckily, it didn’t become completely unattached because that could have caused an accident as there were cars behind me. Complete safety hazard
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720307February 24, 2026
ENGINE, UNKNOWN OR OTHER
This vehicle was sold as new when this vehicle had a defective Turbo Underboost issue from a ECM Issue previously prior to the 2022 Trailblazer being sold to us. This vehicle has a shift to park issue which sticks when you try to Park the vehicle. Next This vehicle has had 4 prior incidents of attempted repair of this Turbo Underboost and a failure to pass emissions which lead to the engine and transmission failure of this vehicle. I have waited since July 6, 2025 of this vehicle being in the shop no rental no loaner. Now no replacement vehicle. For more than nine months and a General Motors open claim since 07/06/2025! GM is hiding the truth about Recalls and Road Hazards not listed to vehicle like this 2021 Trailblazer and other GM vehicles that GM refuses to replace and cannot repair or cover the additional financial hardship placed on unwitting consumer as they sell defective vehicle wholesale or as new vehicles through Chevrolet Dealership across this goble. We must STOP this from happening. GM is not even honoring the Government Guidelines forcing victims to hire counsel to buy time and prevent massive Recalls like ours.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720155February 24, 2026
SERVICE BRAKES, UNKNOWN OR OTHER
Shift to park. Vehicle will not shut off. Also trying to start vehicle having to repeatedly push brakes down hard and push to start before finally starting. I bought this vehicle with 0 miles this has been an on going on and off problem since around 20000 miles have been put on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715160February 2, 2026
BACK OVER PREVENTION: WARNINGS, UNKNOWN OR OTHER
Shift to park message coming on, not allowing vehicle shutoff. No inspection yet, in looking up issue, was prompted to report.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708387January 2, 2026
POWER TRAIN
My 2021 Chevrolet Trailblazer has a defect in the gear shifter system that intermittently fails to recognize when the vehicle has been shifted into “Park.” When this occurs, the vehicle displays a persistent “Shift to Park” warning message and prevents the engine from being turned off or the vehicle from being locked. This malfunction creates a safety and consumer concern, as I am unable to exit and secure the vehicle and am forced to remain inside or leave the vehicle running and unattended. The issue interferes with normal vehicle operation and poses potential safety risks, particularly in situations where I need to quickly power down, exit, or secure the vehicle. After a quick internet search, this issue appears to be affecting multiple others with the same vehicle (2021-2023). A prior lawsuit against GM also resulted in a settlement and recall for older model Trailblazers, but unfortunately did not include the newer models that are experiencing the same known issue. • Gear shifter system is malfunctioned, specific reason and/or part is unknown. Vehicle is available for inspection upon request. • Safety risks noted above. • Problem has been confirmed over the phone and via text by local Chevrolet dealership. Only solution offered was to pay over $650+ for a fix that is not guaranteed to fully resolve the error. • Vehicle or component has not been physically inspected by manufacturer, police, insurance reps, or others. • No warning lamps, messages, or other symptoms occurred prior.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708084December 31, 2025
UNKNOWN OR OTHER
The rear hatch interior trim that seals the hatch from exterior elements and sounds continuously comes off, even after having dealership to repair/replace. The trim will not remain in place and is a distraction while driving and hearing out of vechile noise. And the winter weather causes car not to maintain a constant heat temp
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11706396December 21, 2025
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
After trying to remove rhe key from ignition, it gets stuck and won't come out unless I turn the car on, shift it into drive, wiggle the steering wheel, and try it again. Sometimes it works. Alot of times it take 5-10 min to get it out.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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