GMC Sierra 2500 HD engine shuts off while driving and fails to restart at stops, TCS error message displayed on GMC Sierra 2500 HD

Some GMC Sierra 2500 HD owners report experiencing engine shutdowns while driving, which may be accompanied by a TCS error message and difficulties restarting the vehicle at stops. These issues can stem from various factors, including fuel pump failures that lead to engine stalling, problems with the air intake system, or electrical system malfunctions such as bad grounds or faulty sensors. Additionally, some owners have noted AC actuator failures that can affect overall vehicle performance, as well as instrument panel gauge issues that may disrupt functionality. Contaminated gasoline, often referred to as sour gas, has also been reported to cause engine shut-offs, particularly shortly after refueling. It is recommended that owners experiencing these problems seek inspection from a qualified mechanic to accurately diagnose and resolve the underlying issues.