2024 GMC Terrain problems

Filed Oct 29, 2026 · Fuel system · 63,000 miles · FL

The contact owns a 2024 GMC Terrain. The contact stated that while driving at an undisclosed speed, the vehicle shut off without warning. The contact attempted to restart the vehicle, but the vehicle failed to restart. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The vehicle was towed to a dealer and was diagnosed with fuel module failure. The contact stated the manufacturer was aware of the failure. The failure mileage was 63,000.

Filed Oct 27, 2026 · Electrical · AL

Infotainment System Crashed

Filed Oct 21, 2026 · Transmission · 11,050 miles · MN

The contact owned 2024 GMC Terrain. The contact stated that while stopped, the gear shifter independently shifted from drive(D) to park(P). The contact turned off and restarted the vehicle several times and the vehicle operated normally. A dealer was contacted. The vehicle was taken to the dealer to be diagnosed, and it was determined that the transmission needed to be flushed because debris were found inside the transmission. The transmission was flushed and the vehicle was repaired. The manufacturer was notified of the failure and opened a case. The approximate failure mileage was 11,050.

Filed Oct 2, 2026 · Transmission · NV

GMC Adaptive learning transmission problems that lead to safety concerns, emissions reduction in MPG, and increased wear of the transmission. Regarding GM’s 9T45 automatic 9 speed transmission. Problem: - The GM Adaptive learning of the transmission does not have safe guards in place to prevent unsafe sift patterns and behavior. This results in shift flair behavior where the transmission will drop out of 3rd gear and pause before shifting to 4th gear. It will learn to lock out 9th gear and it will max out with 8th gear at freeway speeds reducing MPG. And it will fail to downshift appropriately while driving leading to the operator wondering why the vehicle will not accelerate when needed; this casual downshift delay then results in excessive downshifting to the lowest possible gear where the vehicle will then lurch forwards; and then it will pause and maintain said lower gear and continue accelerating for 1-2 seconds while the operator presses the brake pedal in response of the vehicle jumping forwards. Individual situations: 1) Lack of 9th gear use at freeway speeds. This is reducing the advertised emissions based on EPA testing. This behavior skews official EPA test results because vehicle operation is not as advertised. 2) Shift flair and unsafe shift delays. This is the most serious behavior. It leads to pauses and delays in acceleration of up to 5 seconds, and it leads to pauses and delays where the vehicle continues to accelerate up to 3 seconds after letting off the accelerator and pressing the brake. 3) Excessive wear. The badly learned behavior is causing issues with shift control pressure and logic, excessive clutch wear leading to damage and worn clutch packs. Analysis: - Resetting the GM Transmission adaptive learning to factory removes these problems, the trans will relearn bad behavior within 2-3 weeks of daily driving. Reset was performed using an Autel Hot function “Quick Learn” procedure for the transmission.

Filed Oct 2, 2026 · Driver assistance, Electrical · MI

I am reporting a recurring backup camera malfunction in my 2024 GMC Terrain AT4. Since purchasing the vehicle, I have experienced repeated instances in which the rearview camera display goes completely black when the vehicle is shifted into reverse. This prevents me from seeing the camera image while backing up. The malfunction presents a safety concern because the rearview camera is an important aid in identifying pedestrians, children, objects, and other vehicles behind the vehicle. When the display goes black, I lose that visual assistance, increasing the risk of backing into a person or object, particularly in parking lots, driveways, and other areas where pedestrians may be present. I have taken the vehicle to authorized dealerships for multiple service visits and repair attempts. Despite these efforts, the same backup camera failure continues to occur. Although different components may have been inspected, repaired, or replaced during these visits, the recurring problem remains the same: the backup camera display goes black when the vehicle is in reverse. The underlying cause has not been adequately resolved. The vehicle has been presented to authorized GM dealerships for diagnosis and repair, and the relevant service records should document the repair attempts and the recurring complaint. I have also submitted a repurchase request to GM because of the ongoing issue, but my request was declined. I am requesting that the federal safety agency document and review this recurring malfunction because of the potential safety risk associated with losing the rearview camera image while reversing. I am concerned that this issue could result in a collision or injury if the driver is unable to see a person or obstacle behind the vehicle. I can provide available service records and make the vehicle available for inspection upon request.

Filed Oct 1, 2026 · Steering · FL

The Electric Power Steering (EPS) gear assembly / rack and pinion failed completely. Yes, the component is available for inspection upon request; it is currently located at the servicing dealership. A total failure of the steering gear assembly caused immediate loss of power steering assist, making the vehicle extremely heavy, rigid, and difficult to steer or control. This sudden mechanical/electronic failure puts the driver, passengers, and other motorists at extreme risk of a collision, especially if it occurs at highway speeds or while negotiating a turn. This did fail on me driving down the Highway! Yes. The problem was officially diagnosed and confirmed by the franchise dealership. They quoted $3,500 to replace the failed assembly. The vehicle displayed a "service power steering" warning message on the dashboard alongside an immediate loss of steering power assist. The failure happened suddenly while driving with no prior mechanical warning signs, symptoms, or gradual degradation.

Filed Sep 1, 2026 · Transmission · NV

Factory powertrain programming actively locks out 9th gear (overdrive) during freeway driving at speeds exceeding 60–65 mph. The vehicle refuses to upshift from 8th to 9th gear, forcing sustained high-RPM operation during standard highway cruising.

Filed Jul 23, 2026 · NC

The rear access closes on its own after sitting open for a period of time. I was sitting at grocery pick up with the access open. This caused it to close on worker at grocery pick up. It stayed closed and I had to hit the button to open it back it did not auto go back up when it couldn’t close.

Filed Jul 14, 2026 · Driver assistance · CO

I was driving about 55 mph with adaptive cruise control set to maintain a three-car-length following distance. It was raining, and when the vehicle in front of me slowed down, my vehicle did not detect it or slow down as expected. Instead, it continued accelerating, and I had to brake to avoid rear-ending the vehicle ahead.

Filed Jul 13, 2026 · Transmission · WA

Leaking transmission fluid at 7,000 miles. Technicians noticed during routine oil change at dealership.