C1298

False DTC C1298 and U1040 - (Jul 7, 2009)

Subject: False DTC C1298 and U1040
Models: 2000-2005 Cadillac Deville
2000-2002 Cadillac Eldorado

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described.

Condition/Concern

Intermittently, C1298 stores in the EBCM and U1040 stores in the PCM. The DTC store when the ignition is turned from OFF to Crank, then released back to RUN. If the DTC are cleared they will not store again until the vehicle is restarted. The cause may be PCM software.

Recommendation/Instruction

Reprogram the PCM.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.