Chevrolet Blazer EV brake problems

SERVICE BRAKES

I am reporting a potential safety defect involving unintended automatic emergency braking/forward collision warning/brake-control behavior, reverse automatic braking, parking brake behavior, and driver-assistance/sensor calibration. Incident XXX ~11:15 AM, [XXX] driving 2024 Chevrolet Blazer EV ~20–25 mph on/near [XXX]. Vehicle displayed red collision alert and abruptly braked hard although the lane was clear; only a car was parked in a driveway on the right. Sudden braking created serious risk of rear-end collision/loss of control. Vehicle used for family transportation; toddler (~30.8 lb) had been in vehicle ~10 minutes before and family includes blind/visually impaired passenger. History of unwanted reverse emergency braking ~every 45 days: Jan 2026 near Crust Pizza Woodforest (backing up) and March 2026 at H-E-B 7988 FM 1488 Magnolia (backing out), jolting child in rear-facing car seat. Prior service at Keating Chevrolet Nov 12, 2025 (including recall/service for Unintended Parking Brake Engagement N252503010 and missing chassis harness plugs update) did not resolve unwanted braking. After June 10, AEB/front pedestrian braking/intersection collision braking were disabled as temporary safety mitigation. Vehicle removed from daily family use, available for inspection, and I request NHTSA review. Any inspection should preserve relevant braking/parking/AEB/forward collision/sensor data before any reset/update/repair. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11743332 — an unverified report by a vehicle owner.

SERVICE BRAKES

This is now the second report from this vehicle with similar issues. This incident happened when in reverse with nothing behind me, the vehicle slammed on its brakes. No audible warning in the vehicle and nothing showing on the dashboard. The vehicle just applied emergency braking. This was a witnessed event.

NHTSA complaint #11737566 — an unverified report by a vehicle owner.

PARKING BRAKE

The contact owns a 2024 Chevrolet Blazer EV. The contact received notification of NHTSA Campaign Number: 25V433000 (PARKING BRAKE); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure.

NHTSA complaint #11715543 — an unverified report by a vehicle owner.

SERVICE BRAKES

1. Vehicle has a horrible squeaking sound coming from the brake pedal area. First dealer diagnosed it as the master cylinder needing replacement. Noise did not go away and GM said that it is normal. The noise is not normal and has never been on any other car I have owned. 2. When reversing, the car sometimes abruptly slams on the brakes as if it is avoiding a collision even though no collision is close to happening. GM refuses to fix the problem.

NHTSA complaint #11715633 — an unverified report by a vehicle owner.

SERVICE BRAKES

Multiple safety-critical malfunctions have occurred on this vehicle involving unintended braking, unintended acceleration, and false activation of driver-assist systems. These events did not happen at the same time and occurred under normal driving conditions. At various points, the vehicle has suddenly applied the brakes without driver input, including hard braking events that felt like an automatic emergency braking activation when no hazard was present. In separate incidents, the parking brake has engaged while the vehicle was in motion, causing abrupt deceleration. There have also been instances of unintended acceleration where the vehicle surged forward briefly without additional throttle input. These malfunctions appear to be related to electrical or ADAS system faults affecting braking logic and propulsion control. No warning lamps or messages reliably appeared before these events. The issues pose a serious risk to the safety of the driver and others because the vehicle’s behavior is unpredictable and can interfere with safe control. The dealership was unable to reproduce the conditions during inspection, but the incidents have occurred multiple times in real-world use.

NHTSA complaint #11699144 — an unverified report by a vehicle owner.

SERVICE BRAKES

Vehicle suddenly braking on its own by fifth time since May 2025

NHTSA complaint #11697276 — an unverified report by a vehicle owner.

SERVICE BRAKES

The vehicle has engaged the brake on multiple occasions unexpectedly. This is related to the recent recall that GM announced and is unable to repair. I have made multiple attempts to reach GM through written mail, phone, X and the BBB and have not received a satisfactory resolution as the safety issue persists.

NHTSA complaint #11688118 — an unverified report by a vehicle owner.

PARKING BRAKE

See attached document for complaint. I am writing to formally notify you, pursuant to the California Song-Beverly Consumer Warranty Act (California Civil Code§§ 1790 et seq.), that my 2024 Chevrolet Blazer EV, VIN 3GNKDHRK4RSXXXXXX is subject to an active safety recall N252503010 for the parking brake system. GM has acknowledged the defect, but no genuine repair or remedy Is available. I have already experienced problems with the parking brake, which substantially impair the safety, use and value of the vehicle. Due to the severity of this defect, I have placed the vehicle at the dealership, Woodland Motors, and it will remain there until GM completes the buyback process. I refuse to drive it because it is unsafe. I further understand that GM has instructed the dealership to adjust the depth sensor as so-called remedy. This adjustment has no bearing on the parking brake defect and cannot be reasonably be considered a repair nor the taping of brake lines that they also instructed to do. It does not address the safety risk or brake failure or unintended activation. Under California Civil Code§ 1793.2, the manufacturer must repair any defect that substantially impairs the use, value, or safety of the vehicle within a reasonable number of attempts and within a reasonable period of time. Since GM has no remedy and cannot provide a repair, it is impossible to comply with this requirement. Accordingly, I hereby demand that GM immediately: Repurchase my vehicle for the full purchase price, including sales tax, registration, finance charges, and any incidental or consequential damages. In addition, I request GM immediately provide me with a loaner vehicle or GM-paid rental until this matter is resolved, as it is unsafe to operate my current vehicle. If GM fails to resolve this matter promptly, I will retain legal counsel and pursue all available remedies, including attorney's fees, court costs and civil penalties under California Civil Code §1794.

NHTSA complaint #11688203 — an unverified report by a vehicle owner.

SERVICE BRAKES

My windshield is defected with no real time when a replacement can be ordered..the interior lining is not sealed properly which is causing a buckling effect by drivers and passengers visors.. Rain is getting inside and soaking into the dashboard causing the electrical system on screens to blink in and out Finally my brake harness is still on recall and my car has been shifting into park which could cause severe problems if I am on the highway..

NHTSA complaint #11687679 — an unverified report by a vehicle owner.

PARKING BRAKE

The contact owns a 2024 Chevrolet Blazer. The contact stated that while driving at various speeds, the vehicle independently came to an abrupt stop, with the "Service Parking Brake" message displayed on the instrument panel. The vehicle was taken to a dealer, where an attempt to duplicate the failure was unsuccessful. The contact was informed that the failure was likely a user error and that no issues were found with the vehicle. The failure persisted, and the contact then received notification of NHTSA Campaign Number: 25V433000 (PARKING BRAKE); which the contact linked to the failure. The vehicle was taken back to a dealer for the recall repair. The contact stated that the repair involved the installation of an anti-abrasive tape around the wiring harness. The manufacturer was notified of the failure, and a representative was sent to inspect the vehicle. The Chevrolet Representative was later informed by the dealer that the brake lines were already taped prior to the recall and that no additional repairs were needed. The vehicle remained in the possession of the dealer because the contact was concerned about the safe operation of the vehicle. The failure mileage was unknown.

NHTSA complaint #11681938 — an unverified report by a vehicle owner.

PARKING BRAKE

The contact owns a 2024 Chevrolet Blazer. The contact received notification of NHTSA Campaign Number: 25V433000 (Parking Brake); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure.

NHTSA complaint #11681431 — an unverified report by a vehicle owner.

SERVICE BRAKES

This has happened to me numerous times where I’m driving and out of nowhere the car shortstops it is a danger to drive this car. And I have called Gm over and over and they don’t want to do anything about it.

NHTSA complaint #11681127 — an unverified report by a vehicle owner.

PARKING BRAKE

The contact owns a 2025 Chevrolet Blazer. The contact received notification of NHTSA Campaign Number: 25V433000 (Parking Brake); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted and diagnosed that the windshield was not installed properly and needed to be replaced. The contact stated that while raining, water leaked into the vehicle through the windshield onto the dashboard. The contact stated that the seal had detached on the passenger’s and driver’s sides of the vehicle. The contact stated that while driving at an undisclosed speed, the vehicle shifted into park(P). The vehicle had to be turned off and restarted to shift out of park(P). The failure had occurred while driving, idling, and while parked. There were no warning lights illuminated. The dealer also discovered that the hood of the vehicle and the windshield were not flush, causing a slight detachment. The vehicle was not repaired. The manufacturer was made aware of the failures; however, no assistance was provided. The failure mileage was approximately 3,000.

NHTSA complaint #11680568 — an unverified report by a vehicle owner.

PARKING BRAKE

The contact owns a 2024 Chevrolet Blazer. The contact stated that while driving at an undisclosed speed, the vehicle abruptly came to a complete stop, after which the contact became aware that the parking brake had been engaged. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 25V433000 (Parking Brake); the VIN was included, but parts were not yet available. The manufacturer was not notified of the failure. The failure mileage was unknown.

NHTSA complaint #11679894 — an unverified report by a vehicle owner.

SERVICE BRAKES

Car can spontaneously activate the Parking park. Recall has been ongoing and Chevy has yet to tell me how to repair it. They said risk for a severe accident is high.

NHTSA complaint #11679681 — an unverified report by a vehicle owner.

SERVICE BRAKES

Multiple safety-critical systems have malfunctioned since shortly after purchase, continuing to this day. The most serious is the forward collision braking, which has triggered randomly during normal driving. These braking events have occurred on highways and surface streets, posing a serious risk if a vehicle were following closely. During arbitration, the manufacturer admitted this is a known defect with no current fix, yet continues to return the vehicle marked as “repaired.” Additional issues include: Adaptive cruise control failure Intermittent charging failures (won’t initiate or randomly stops mid-charge) Infotainment screen freezing or going blank Inconsistent air conditioning performance Rear hatch failing to open/close and requiring physical force Bluetooth audio that disconnects unless the vehicle is powered off for 15+ minutes These problems have been reported to two GM-authorized dealerships. One repair attempt at a second location was ignored in arbitration. I also contacted GM corporate multiple times directly, requesting support. My attempts were either unanswered or dismissed, with no action taken. Many concerns were labeled “unable to duplicate,” even when I provided documentation. No warning lights appear with braking or charging failures. Most issues temporarily resolve after a full power-down, suggesting a software or control system fault. The manufacturer participated in arbitration and acknowledged the unresolved defects, but refused to provide further oversight or assign a factory technician. The vehicle is available for inspection. I am reporting this because the problems are ongoing and impact safety, reliability, and functionality.

NHTSA complaint #11678714 — an unverified report by a vehicle owner.