Over the last 3 years we have had ongoing issues with our truck going into limp mode. We have spent thousands of dollars at dealerships and mechanics trying to troubleshoot the issue. Several occasions while trying to merge onto the freeway the truck would slip into limp mode causing us to have other drivers slam on their breaks almost hitting us. We had 2 cars in January of 2023 veer off the side of the road. We pulled over and thankfully they missed hitting one another. We just couldn't speed up to get out of their way. We cant believe their hasnt been a safety recall on the TCM for these trucks. GMC started doing Service bulletins in 2013 about the TCM causing the limp mode issues. There are dedicated facebook groups with over a 1,000 followers who are experiencing the same issues with these TCM's. Someone is going to die if they havent already. Several collisions, involving the years affected, are being re-investigated to determine why the vehicle slowed abruptly causing a fatal accident. A class action lawsuit is gaining momentum because GM will not do anything about the TCM.

- Sequim, WA, USA

Life threatening safety problem: While merging into high-speed traffic on [xxx] in charlotte nc, my 2010 GMC Sierra rapidly decelerated from approximately 65 mph to 10 mph. Two tractor-trailer trucks going at least 70 mph narrowly avoided rear-ending me. Only the lack of traffic on there right side prevented a major disaster. My dashboard showed a engine power is reduced/service traction control/service sabilitrak warnings, and the engine idled erratically as I maneuvered off the to the side of the highway. There was no throttle response. This engineer design put the safety and lives of many at risk by dumping engine power to what is the equivalent of slamming on the breaks at high speed without warning. In April 2018, approximately 8 months ago, I had the exact same problem while driving in my neighborhood road. An authorized dealer completed a $679 replacement of my throttle-body gasket and gas pedal assembly (see attached receipt). The truck drove without issue until this incident. I didn't think this was a serious safety issue because it did not happen at high speed. Now, I have the same problem occurring at a high rate of speed on the highway. Finally, the dealer explains that there are multiple issues that can cause this malfunction and they are now completing another $600+ repair, replacing multiple parts (repair bill not yet available). Based on this troubleshooting and repair history, a consumer is never getting a guaranteed permanent fix for this problem. This begs the obvious question, of why is there a designed malfunction that jeopardizes safety in this manner? parts of this document have been redacted to protect personally identifiable information pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Charlotte, NC, USA

The contact owns a 2010 GMC Sierra 1500. While driving approximately 40 mph through a snow bank, the check engine and traction warning indicators illuminated. The stability track indicator signaled the system to be off and needed servicing. The contact had not taken the vehicle to the dealer. The contact spoke with a certified mechanic who stated that the throttle body, brake sensor switch, and faulty air intake system failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and directed the contact to NHTSA and/or the dealer. The VIN was unknown. The approximate failure mileage was 11,458.

- Riverhead, NY, USA

The contact owns 2010 GMC Sierra 1500. The contact stated that while driving 20 mph, the vehicle sputtered and failed to accelerate above 20 mph. The contact mentioned that the check engine and service traction control warning lights illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed the throttle position sensor codes needed to be reset. The vehicle was repaired however, the failure recurred. The manufacturer was notified of the failure. The failure mileage was 67,500.

- Liberty, SC, USA

The contact owns a 2010 GMC Sierra 1500. The contact stated that the carpet on the driver side floor was beginning to curl up, which caused the sole of his left foot to become captured when attempting to apply the brakes. The dealer inspected the vehicle and agreed to perform the repairs; however, he later backed out because they were unable to determine an adequate remedy for the failure. The contact did not inform the manufacturer of the failure nor was the vehicle repaired. The current mileage was 5,000 and the failure mileage was 3,800.

- Nordman, ID, USA