2020 Chevrolet Traverse: check engine light

Filed Oct 16, 2026 · Engine · 104,000 miles · IL

The contact owns a 2020 Chevrolet Traverse. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed with a fractured flex pipe. The mechanic informed the contact that the failure was associated with GM Technical Service Bulletin: PIP 5681C and Manufacturer Communication Number: 10211780 (Engine and Engine Cooling), and the contact was referred to the dealer. The vehicle was taken to the dealer, who confirmed the failure was not covered under warranty. The contact spoke with the manufacturer, who also confirmed that the vehicle was not covered under warranty. The manufacturer referred the contact to the federal safety agency Hotline to file a safety complaint. The failure mileage was approximately 104,000.

Filed Oct 2, 2026 · Engine · 82,000 miles · MI

The contact owns a 2020 Chevrolet Traverse. The contact stated that the exhaust system was sagging due to an improperly welded mounting bracket. The contact became aware that an exhaust system bolt was cracked and missing. The vehicle was taken to the dealer, where a technician confirmed that the weld on the exhaust hanger had separated from the subframe, causing the loud rattling sound of the exhaust system. Additionally, the check engine warning light was frequently illuminated, and the exhaust system was louder than normal. The failure mileage was 82,000.

Filed Sep 21, 2026 · CA

On September 18,2026 owner #3 bought the vehicle on December 9,2026 at the time of purchase it had 46,545 on September 17 check engine light came on and the diagnostic code came up as P0171 lean bank one from Pep Boys.Pep Boys scan found P0171 lean bank 1 meaning that is sucking in too much oxygen, upon inspection found rear exhaust manifold is cracked, creating a vacuum and suck. ng in oxygen,causing the engine light, the exhaust hanger is broken and pictures from PepBoys show the exhaust hanger is broken and was held by poxy putty from previous owner #2 this was not disclosed at the time of sale on December 9,2026 and CarMax failed to complete a 125+ inspection before it left the dealership lot.The Poxy putty caused the manifold to crack with catalytic converter and 2 O2 sensors. Further another serious concerns owner #3 has as reported on history from Good Car reported from other consumers owning 2020 Chevy Traverse is the Shift to Park issue which was discovered on August 5,2026 at Affordable Transmission in Lancaster when i got my transmission service. This is also another pre-existing condition that was not disclosed by CarMax at the time of sale on December 9,2025. I feel the car is defective and not safe. The vehicle is at my mechanic getting evaluated. Per Car Facts this vehicle was involved in a minor accident which was not disclosed.

Filed Jul 30, 2026 · Engine, Transmission · 150,970 miles · SC

The contact owns a 2020 Chevrolet Traverse. The contact stated that the transmission was slipping and there was a delay while the transmission was shifting gears. The vehicle was sputtering and jerking while driving. While turning out of a driveway and driving approximately 5 MPH, the vehicle stalled. The check engine warning light was illuminated. The vehicle was towed to the residence. The local dealer was contacted and informed that there was no recall on the VIN. The vehicle was not diagnosed or repaired. The manufacturer was contacted but referred the owner back to the local dealer for assistance. There was no additional assistance provided. The failure mileage was approximately 150,970.

Filed Mar 4, 2026 · Engine · CA

Failed/failing hydraulic timing chain tensionors. Common issue for this engine said to be caused by poor oiling. After speaking to many shops, this is just one of the many, very common issues that occurs in this vehicle. Started on February 20th, 2026. There are no warning or check engine lights on for this issue. People who are unfamiliar with the symptoms may be driving a vehicle that may suddenly stop running without warning as there is no light illuminated on the dash. Online it states that this may be caused by not performing oil change services on time. For my particular situation, I am a preventative maintenance specialist for the past ten years. I am professionally trained and perform PM services daily. I know my Traverse has been very well maintained and serviced with premium synthetic motor oil since my ownership. And despite this, I am now having to pay a significant amount of money to have this fixed or risk the safety of myself, my family and really anyone else on the road. My vehicle is available upon request any time.

Filed Jan 2, 2026 · Engine · 90,100 miles · MI

The contact's son owns a 2020 Chevrolet Traverse. The contact stated that while driving at various speeds, the vehicle made an abnormal rattling sound, and the check engine warning light was illuminated. The vehicle was initially taken to an independent mechanic who could not perform the repair. The contact was referred to another independent mechanic, where it was diagnosed that a crack in the catalytic converter had caused a defect within the exhaust manifold. The contact was then informed that the failure was related to Technical Service Bulletin Number: PIP5681C and was referred to the dealer for assistance. The contact had taken the vehicle to the dealer, where the contact was informed that the vehicle no longer qualified for the TSB repair due to the mileage. The manufacturer was notified of the failure and made the same assessment. The contact was then referred to the federal safety agency Hotline for assistance. The vehicle had yet to be repaired. The failure mileage was approximately 90,100.

Filed Nov 6, 2025 · MD

Leaking exhaust noise at start up began around 9/22/25. Noise became louder over the following week. Check engine light came on morning of 9/24/25. Immediately took it to local GM dealership for inspection. Dealership first said it was a cracked front exhaust pipe at the bracket and then they called back and said rear pipe at the bracket was broken also the whole system needed to be replaced because the brackets were not separate but welded directly to the pipe. The estimate was over $1300. Dealership then said the error coded was probably because of the exhaust pipe and catalytic converter and that they require replacement. I discovered there are already recalls and special coverage for the same issue on the 2019, 2021 and 2022 year models of this vehicle. I contacted GM and they acknowledged the problem in other model years before and after but said there isn't enough complaints for this model year. This is a known problem and design flaw. This needs to be addressed by GM immediately. NONE of the welds have held on any parts of the exhaust system or the catalytic converter.

Filed Oct 22, 2025 · Engine · 110,045 miles · TX

The contact owns a 2020 Chevrolet Traverse. The contact stated that while driving at undisclosed speeds, there were abnormal sounds coming from the exhaust system. The contact stated that the vehicle sounded like a motorcycle. The contact stated that the check engine warning light was illuminated, and DTC: P0171 was displayed. Additionally, the contact stated that there were exhaust fumes entering the cabin of the vehicle. The contact had taken the vehicle to a local dealer, where it was diagnosed, and it was determined that there were cracks in the exhaust pipe and the catalytic converter pipe at Bank 2 and Bank 1 that needed to be replaced. The vehicle was not repaired. The contact researched online and related the failure to Technical Service Bulletin Number: PIP5681A. The contact had called the dealer to advise that there was a bulletin covering the cracks on the exhaust and the catalytic converter pipes, but was informed that the cracks on the pipes were on the wrong side and that the vehicle was not covered under warranty. The manufacturer was not informed of the failure. The failure mileage was 110,045.

Filed Sep 23, 2025 · VA

Rattling noise when starting vehicle started occurring a year ago. Dealership diagnosed a broken bracket weld that holds the exhaust pipes in place. Dealership cut off bracket. A year later there is a hole in one of the exhaust pipes because of the broken bracket and a check engine light comes on. There is a recall for the 2018-2023 Traverse models EXCEPT the 2020 year for the exact same issue. Why is every other covered but not the 2020? Why do I have to pay for a known GM issue that causes a hole in the exhaust pipes from their crappy bracket welds? This is an emissions issue yet we are being denied by our dealership.

Filed Sep 4, 2025 · Suspension · TX

Exhaust and catalytic converters keep breaking off causing loud noise and check engine light to stay on

Filed Sep 3, 2025 · Transmission · NC

Check engine light came on day after I purchased this vehicle. Cracks in both front exhaust pipes. Seem to be an issue with 2020 chevy traverse models.

Filed Aug 27, 2025 · IL

Catalyst converter bracket on the front of my exhaust is broken causing loud noise and the check engine light to remain on. This should be in connection with specialized coverage program N212356540