One problem related to engine failure has been reported for the 1999 GMC Jimmy. The most recently reported issues are listed below.
Vehicle shuts off while driving & will not restart. Dealer has been unable to identify the cause. Has replaced ecm & attached a vehicle data recorder in order to hopefully locate the source of trouble. I have been in dangerous situations, traveling at high speeds on busy roadways when the engine failure occurs. I am given no warning, nor am I able to restart the car. I have had the car towed 4 times & I just bought the car a month and a half ago.