GMC Sierra 1500 owners have reported 1 problem related to service engine light on (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sierra 1500 based on all problems reported for the Sierra 1500.
While driving with the roads in a wet condition, for various lengths of time, and in different maneuvers, the service engine light will start flashing and the vehicle will begin to lose power. After a few minutes, the service engine light will go solid and the traction control light will illuminate. The vehicle loses more power. On braking, just before the vehicle comes to a complete stop, there is a clunk in the transmission and the vehicle lurches. This has occurred 6 times in the last 14 months. Upon investigation, trouble code p0308 shows in the obd tool. The issue could not be reproduce by the dealership so there has not been any resolution, just thoughts.
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