One problem related to ignition has been reported for the 2004 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 GMC Sierra 1500 based on all problems reported for the 2004 Sierra 1500.
: the contact stated while driving various speeds, the engine stalled without warning and would not restart. The vehicle was towed to a dealer who determined the ignition harness needed replaced. After the ignition harness replacement, the problem persisted. The vehicle is currently awaiting further inspection by the dealer. The manufacturer was alerted.