Grand Prix

Engine Control Module (ECM) can fail on Pontiac Grand Prix

Problem Description and Possible Solution

The Engine Control Module (ECM) can fail causing stalling, and engine and transmission drivability concerns.

Problem Data
RepairPal Verified
Average mileage: 115,274 (19,450–195,000)
12 model years affected: 1991, 1992, 1993, 1994, more2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
29 people reported this problem
Viewing 1 - 7 of 7 comments
Engine stops unexpectedly when driving. Mostly it is at low speeds, but it has happened on the highway a few times as well. Sometimes the engine has enough RPM that it re-fires on its own, but sometimes I need to shift to neutral and manually restart it.
It did stall one time in the middle of an intersection! that could have been really bad! I do not feel safe driving this car and am going to park it until I can sell it or trade it off.
the ECM shuts down the engine during driving and at idle
how to fix this
After 1000.00 dollars charged by a mechanic? Finally a real mechanic replaced the ecm
Engine stalls and shuts off going down the road. Have to stop and put it in park and it will crank. Also does this problem when vehicle is idling
My Grand Prix just shut off one day at a stoplight. It was dead. Had it towed and turned out to the be the ECM. It was $800 repair.

You'll know when it happens, it's like I was out of gas.
Sometimes car won't start and sometimes it will
took to firestone and they said it is reading a bad emu/ecm and the dealer has to fix it.