Calibration Mismatch

Test 1 - 2:

Test 3 - 5:

Test 6:

SYMPTOM
CALIBRATION MISMATCH

WHEN MONITORED
At ignition on and at least one supply above 8.3 volts, the ACM compares the 6th digit of the Bus VIN message to the 6th digit of the VIN stored in the ACM memory. (1) Light duty and (2, 3 or 4) for heavy duty.

SET CONDITION
The code will be set if the 6th VIN digit of the PCI Bus message and the stored ACM VIN do not match.

POSSIBLE CAUSES
- PCM, PCI communication failure
- PCM vehicle identification numbers incorrect or missing
- Low voltage to ACM
- ACM calibration mismatch
- Stored code or intermittent condition
- Active code present