One problem related to automatic transmission control module has been reported for the 2004 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Jeep Grand Cherokee based on all problems reported for the 2004 Grand Cherokee.
Incident 1, on Saturday February 5, 2005 while maneuvering into a space in a parking lot I shifted into reverse with my foot on the brake suddenly the car, 2004, Jeep, Grand Cherokee lurched backward. I pressed more firmly on the brake pedal and car jerked. Then, the engine revved higher, causing the car to hurtle toward cars in the row behind. Only by standing on the brake pedal did the vehicle stop, but just inches from a car behind us. Dealer's mechanic subsequently could find nothing wrong ,and could not duplicate the event. Incident 2 occurred on Wednesday April 20, 2005. While braking gently when approaching a red traffic light the engine suddenly started revving quickly. I braked harder, but the engine revved higher, overcoming the braking effort I again stood on the brake, bringing the car to a halt only a few feet from a car waiting at the light. Examination of the brake pedal at this time showed that my foot was only on the brake pedal, and not near the accelerator pedal, and that nothing was pressing on the accelerator pedal.