Detroit Fault Codes SPN 84/FMI 14 – EPA07 – GHG14

1. Check for multiple codes:

1.1. If Common Powertrain Controller (CPC) SPN 168/FMI 0/14/18 (battery voltage) are present, troubleshoot and repair these first.

1.2. If Motor Control Module (MCM) SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.

1.3. If only a J1939 Error fault is present, Go to step 2.

2. Has the CPC been recently reprogrammed?

2.1. Yes; check the proper configuration of the CPC.

2.2. No; connect DiagnosticLink® to determine which chassis modules are configured for the vehicle and their communication status. Once this is done, follow the appropriate module communication troubleshooting procedures for the affected module.

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