Two problems related to ignition module have been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.
I was informed by oconnors dealship of auburn, me. That the ecm shorted out and needed replacement at a cost of 700 dollar, not including labor.
Truck jammed on brakes and shifted into reverse with no warning due to the ecm (brain) malfunctioning. Please describe details.