Detroit Fault Codes SPN 84/FMI 2 – 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, connect to DiagnosticLink® Standard and check the proper Vehicle Speed sensor (VSS) configuration of the CPC in the parameters list.

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 procedure for the affected module.

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