Northstar Engines and System Technical Discussion Discussion, Need help with codes in Cadillac Engine Discussion; I have 2 codes in History on my 98 Deville with 65,000 miles on it they are
Might help until someone can help with the cause. The PCM? is normal. You might try to reset first and see if they come back. Not sure exactly how it is done but can be done in the DIC. You could also try disconnecting then reconnecting the battery. Of course that will give you a code too which will go away after 40 starts. Has any work been done on the car recently?
Body code B1171 - Internal SDM Failure
Network Code U1255 - Serial Data Line Malfunction