Cadillac DeVille Problems

Powertrain Control Module (PCM) Can Fail Affecting Drivability on Cadillac DeVille

Problem Description and Possible Solution

The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.

(20 people reported this problem)

Cadillac DeVille Vehicles With This Problem

RepairPal Verified
Average mileage: 120,763 (15,000–255,000)
5 model years affected: 1990, 1991, 1992, 1993, more2003
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Viewing 1-9 of 9 comments
03 Deville new battery no power anywhere at all car is dead to the key turn need help its in good shape hate to lose it but not trying to spend crazy money can't pull code car is completely dead help please
My 94 Cadillac Deville has been sitting in the shop. Got a call that the pcm was bad. It wouldn't stay running, crazy sounds, just etc. So I got that replaced and ran perfect. Now I'm haven transmission problems. I "suppose" it shifts hard going into second gear and from there it drives perfect. Could it be the Pcm and that they didn't program it right cause I never had this problem until I had one exchanged
It stalled on me one day, then next it worked fine. Took the aircleaner box and filter out, tapped on the pcm and it sarted to shoot all kinds of error messages to my dash. Still trying to fix it.
I was having the same issue with my pcm and I send it to be reprogrammed thru an online store
Replaced my 4.5liter engine and replaced bad injectors and the engine still doesn't stay running and the isc motor runs the rpm up and down for about a minute the it stalls.rechecked the distributor and fuel pressure. Had the catalytic converter replaced.