One problem related to ignition module has been reported for the 2003 Chevrolet Cavalier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Cavalier based on all problems reported for the 2003 Cavalier.
I have replaced the ignition control module 4 times in this car. It fails such that the engine in only running on 2 cylinders. Testing has shown the coil packs are ok and the problem is with the icm computer.