2025 Chevrolet Traverse

Warning codes - Service Brake Assist, Service Electronic Stability Control (ESC), Forward Collision system unavailable. Brake pedal felt different with an associated clunk noise. Brake Fluid believed to have been leaking in garage. Dealer diagnosis as Master Brake Cylinder failure. No parts available/no ETA available. Car is 5 months old and under 5,000 miles on the odometer.

I started my Traverse and the brake light, forward collision alert, brake assist, stability control lights came on. The warning messages to service ESC, and service brake assist also came on. I have 2182 miles on my vehicle. No warning of anything wrong before this happened. It is available for inspection. It was towed to the closest dealership who determined the master cylinder needed replacing. I did not drive it due to warnings the brake systems were not functioning properly. Could have caused a wreck if they did not work. It has since been towed to the dealership it was purchased at awaiting their diagnosis. The first dealership said the master cylinder is on backorder with no ETA.

Our 2025 Chevrolet Traverse experienced a brake system failure on July 17th. We took the vehicle into the shop with the following errors on the screen: Service brake assist Service ESC Forward collision system unavailable My wife and children were in the car when the incident occurred. We have a 20 minute drive, through traffic, to the nearest dealership. At any point, the brakes could have completely failed. The problem is active as the car still remains at the dealership, Alan Jay Chevrolet of Wauchula. The vehicle has not been inspected by the manufacturer, but by the qualified service staff at the dealership.

Master Cylinder failure after less than 3 months of ownership and only 3,891 Miles. Multiple warnings lights related to brakes appeared when the car was started. GM already had a TSB for the 2024 Traverse but has not come out to say 2025 models are impacted yet. Multiple reports of people that do have the issue are waiting weeks for a replacement part because GM is not able to source them. Seems that there is a known issue but GM is just waiting for something to happen due to the lack of parts. Given it's the brakes could result is serious injury due to GMs negligence.

Car with only 3900 miles brand new after 3 months the braking system, collision system, parking assist, ABS and brake lights appeared on dashboard, at the dealer since 07/14/2025, I was suggested not to drive the car. Same day called GM customer service and opened a case, the dealer gives me a rental car to use until the repair is finished. At the end of the same week I called again GM customer service asking about news and the parts was back ordered, they told me to wait 5 business days for a possible repurchase or for any updates for parts. Today 07/31/2025 I called again GM and they said that the parts were shipped but they didn’t had the tracking number, I called my dealer and the parts are in back order without eta.

As I was driving my 2025 Traverse Z71, at 2180 miles, different lights popped up on the dashboard. I was backing out of my garage when it happened. Lights were ABS, BRAKE, Electronic Stability Control, and pre-collision warning light. Also notifications for Service Brake Assist and Service ESC also came on. The dealer had me drive it to their shop 25 miles away. After inspection, the Chevrolet service department said it was unsafe to drive my Traverse. The part they needed to replace was the Master Cylinder/Brake System Control Module. Unfortunately the part was on backorder and they did not have a loaner I could borrow. I turned in my vehicle Wednesday, June 25, 2025. I got my Traverse back Thursday, July 24, 2025. It was very close to 30 days and I would have followed guidelines for lemon law in state of WI. When I picked up the vehicle, there were several other Traverses waiting on the same part. As of now July, 30th, vehicle is in working order.

Purchased new 25 Traverse. Driving from AR to OK, stopped at a store, parked car. Upon returning to car, start ignition and red "BRAKE" light illuminated as well as ABS, Traction control and forward collision icons all lit. "Service brake assist, service esc, rear auto brake and park assist unavailable" warnings all show on the dash. Vehicle had 2747 miles at time this occurred. Systems check on dash showed all tires not registering on the vehicle and the vehicle icon illuminated orange. Vehicle needed to "relearn sensors." Vehicle has several clicking noises in the dash after shutting off. Vehicle brake pedal clicks when depressed at low speeds (as in driving in a parking lot) These noises and issues were not occurring prior to this vehicle stopping at the 2747 miles. Vehicle is unsafe to drive as this is the main stopping system, we were 300 plus miles from home when this happened.

On 6/18/25 vehicle started displaying "Service braking system" and "service electronic stability control" warnings along with warning chimes and various malfunction indicator lights. Malfunction Indicator Lights included service brakes, ABS, and ESC. Vehicle taken to dealer service department on 6/18. Service department has replaced the battery and brake assist module, but the problem persists. GM says to replace the brake master cylinder, but no parts are available. Dealer has impounded the car as a safety concern and has provided a loaner vehicle. Because this involves the service brakes it is a safety concern.