2024 Cadillac Lyriq Brakes Problems

The contact owns a 2024 Cadillac Lyriq. The contact stated that while reversing, the rear-view safety sensor alert did not function as intended. In addition, the contact stated that the auto-braking safety sensor did not activate. The contact's vehicle crashed into a tree. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure, and a case was filed. The contact stated that the case was denied. In addition, contact was denied to receive any documents providing the decision of the case. The failure mileage was approximately 18,125.

I was traveling on the freeway at approximately 70 mph, at about 5:15 pm. I was not using cruise control. There was no one in front of me for maybe a quarter mile. Suddenly and without warning, the car slammed on the brakes. A yellow alert came up on the dash telling me the Forward Collision system had been activated. The red warning lights at the front of the dashboard (the heads-up display) also flashed. The road was dry, I was on an entirely straight section of road, and there were no shadows. Besides scaring me half to death, if someone had been immediately behind me, they could easily have slammed into me. The car has not been inspected by the dealer, etc. I believe OnStar should have a record of it happening, but I have not contacted them.

I am submitting this follow-up to document new information and continuing concerns regarding my 2024 Cadillac Lyriq EV, which experienced sudden unintended acceleration during a parking maneuver. GM and its claims administrator (ESIS) have now completed their review and issued a denial letter on October 31 2025, stating “no defects were found.” However, the denial included no supporting technical findings, analysis, or data explaining how that conclusion was reached. Despite multiple written requests, GM has not provided the following key event-data modules: – Brake System Control Module (EBCM/iBooster) export (brake pressure, pedal position, brake override flags) – Propulsion/Drive Control Module data (torque request vs actual torque and accelerator input) – Front Camera Module metadata (timestamps and event record IDs) Additionally, several data discrepancies remain unresolved — including mismatched timestamps between the ASCM and FCM reports and camera images that do not correspond to the actual crash scene. On October 29 2025, GM publicly announced Customer Satisfaction Program N252521980, covering certain 2023–24 Cadillac Lyriq and 2024 Chevy Blazer EV vehicles for a Brake System Control Module software update due to possible brake-control performance issues. Because my incident involved loss of braking response, this recall appears directly relevant. I have requested confirmation whether my vehicle is affected and whether this module was analyzed in GM’s investigation, but have not received a reply. I am requesting that NHTSA review GM’s handling of this case to determine whether the engineering review was complete and whether the vehicle’s BSCM or related systems could be implicated in unintended acceleration or brake override failures. GM Case #1092995 – Submitted to ESIS/GM Product Investigations Group. Thank you for your attention and for documenting this matter in the defect database.

I was driving on Saturday September 3 at 5 pm over the Chain Bridge entering Washington DC. Traffic was heavy and the auto brake went on when I was about 15 feet from the car in front of me. I was using one-pedal driving and when I pushed on the gas slowly we started slowly moving forward. I was traveling around 3 or 4 miles an hour and the car would not slow down when I took my foot over the pedal. One pedal driving apparently stopped working. I then applied the brakes gently and the brakes did not work. I then pushed the brakes hard and still no brakes worked. I tried pumping the brakes and nothing worked. The car gently ran into the car in front of me causing no damage to the car in front and he kept on his way. My front grill was cracked and bumper was slightly damaged. The signal on the dashboard said parking brake engaged which it was not. While the auto safety brake engaged minutes earlier when it was not needed it did not work when the car was drifting uncontrollably into the car in front of me.

While driving the car on 2 separate occasions, the breaks failed and the car would not stop completely. Twice I have taken the car to the dealer to be repaired and the car is currently at the dealer.

When it rains, just a steady rain, not a downpour, the vehicle slams on the brakes trying to back up. It literally took 3-4 minutes to back out of the driveway. I was also in a parking lot trying to back out and the same issue which created a significant safety hazard with other vehicles. Research online indicates this is not an isolated issue.

What component or system failed or malfunctioned, and is it available for inspection upon request? The issue involves the Anti-lock Braking System (ABS) and the transition between regenerative braking and friction braking in my Cadillac Lyriq (RWD). The ABS engages unexpectedly during normal braking conditions when using one-pedal driving. The vehicle is available for inspection upon request. How was your safety or the safety of others put at risk? The unexpected ABS activation creates inconsistent and unpredictable braking behavior, including a pulsing sensation and reduced braking confidence. This affects the driver’s ability to modulate braking smoothly and predict stopping distance, increasing the risk of a collision, especially in normal traffic conditions where consistent braking response is critical. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The issue has been reproduced during multiple visits to authorized Cadillac dealerships. However, I have been told that the vehicle is “operating as designed,” despite the abnormal braking behavior. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle has been inspected by multiple authorized Cadillac dealerships and the issue has been escalated to General Motors. No resolution or fix has been provided to date. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There are no warning lights or messages associated with this issue. The problem occurs intermittently during normal driving conditions, particularly when transitioning from regenerative braking (one-pedal driving) to applying the brake pedal. The issue began shortly after taking delivery of the vehicle and has persisted since.

On [XXX], my wife was driving our 2024 Cadillac Lyriq RWD (VIN: [XXX] ) in stop-and-go traffic on [XXX] at 5-10 MPH. She was maintaining a safe distance when the truck ahead suddenly stopped. She pressed the brakes firmly, but the vehicle failed to stop, resulting in a collision. Despite full brake application, the car did not stop as expected. The Automatic Emergency Braking (AEB) and Forward Collision Alert (FCA) systems did not activate. No alerts or braking assistance occurred, even though these safety features were enabled. Her passenger witnessed her screaming that the brakes were not stopping the car. The crash caused front bumper damage, and a police report was filed. Investigation & GM’s Response GM inspected the vehicle but refuses to provide testing details. The Crash Data Report does not show any recorded braking event or safety activation, despite my wife pressing the brakes. GM has not explained: Why the brakes failed to stop the vehicle. Why AEB and FCA did not activate. Why no braking data was recorded despite the collision. Safety Concerns My wife is now afraid to drive the vehicle and refuses to continue driving it after repairs. I may be forced to break my lease or sell the car due to this serious safety concern. This raises major safety risks for other Cadillac Lyriq owners, especially with known braking-related recalls on 2023 and 2024 models. Request for Investigation I urge NHTSA to: Investigate braking system failures in the 2024 Cadillac Lyriq. Review AEB and FCA non-activation during low-speed collisions. Determine whether GM is withholding data or failing to acknowledge a defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

See attached document for complaint.

The contact owns a 2024 Cadillac Lyriq. The contact stated that while driving under 35 MPH on several occasions, the brakes were independently activated. The TPMS warning light was illuminated intermittently. Additionally, the front passenger’s side tire was flat. The vehicle was taken to a dealer where it was diagnosed and determined that an undisclosed system software needed to be updated. The vehicle was repaired but the failure persisted. The manufacturer was notified of the failure. The failure mileage was approximately 7,000.

When approaching a red light at 5-10mph, I engaged the brakes, but the brakes did not work and the automatic breaking didn't work either, leading me to rear end the car in front of me. There were no prior warnings lights or notices, and the breaks were working properly before and after the accident. The car was towed to the dealership for inspection, but they could not find anything wrong and have contacted GM for further inspection.

I was driving the car on the turnpike and out of nowhere the rear collision system went offline and the automatic breaking was triggered while I was going 70 mph in rush hour. The brakes started to smoke and smell and the the warning of ‘breaks overheating. do not drive. call service’ happened. I proceeded to narrowly avoid many cars on the road by having to cross three lanes of traffic over to the shoulder and the car was fully smoking, I quickly turned it off I got out and stepped away. After some time when I felt safe returning to the vehicle I turned it back on and was still showing breaks were overheated message and then was forced to get the car towed and take an Uber home. The vehicle is only 2 months old with ~3300 miles on it. The vehicle is currently sitting at the closest dealership to the event and they are unable to work on it due to a lack of EV service provided there and they told me they are unable to have it moved to the dealership I purchased it at.

As I approached a stop sign and hit the brake the car did not stop. I pounded on the brake but there was no response at all; it just coasted forward. The car continued to move and hit the car in front of me stopped at the stop sign. That car, a Nissan Rogue, had no damage. I was barely moving but the plastic sheet in the front of the Lyriq was cracked.

The contact owns a 2024 Cadillac Lyriq. The contact stated while driving at approximately 3 MPH as she was entering her garage to park the vehicle, she depressed the brake pedal, however, the vehicle continued forward and crashed into a tool chest located at the back of the garage wall. The contact stated that the front of the grill and the front bumper were damaged and had to be replaced. The contact stated no warning light was illuminated. The contact stated that failure reoccurred when she was parking the vehicle in a parking lot. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the ABS system had failed and caused a loss of braking ability. The contact was advised by the dealer that the failure was related to NHTSA Campaign Number: 24V589000 (Service Brakes, Hydraulic). The contact had the recall completed at that time. The manufacturer was informed of the failure. The failure mileage was 3,000.

There was “Brake System Failure” message on the EV’s digital display. It happened 3 times in less than a month. When it happened, I had to apply the break very hard. Otherwise, the car would not stop completely and would not hit the car in front. Top speed is limited 43 mph so I could not drive it on freeway.