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Detroit Fault Codes SPN 84/FMI 13 – EPA10 – GHG14

15/12/2025
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SPN 84/FMI 13 - EPA10 - GHG14
J1939 Wheel-based Vehicle Speed Sensor Signal from Source #1, #2, or #3 is Missing
SPN 84/FMI 13
Description Vehicle Speed Sensor Signal Missing
Monitored Parameter Vehicle Speed Sensor (VSS)
Typical Enabling Conditions RPM greater than 1500, Torque Demand On
Monitor Sequence None
Execution Frequency Continuous when enabling conditions met
Typical Duration 10 Seconds
Dash Lamps MIL
Verification RPM greater than 1500, Torque Demand On

Check as follows:

1. Check for multiple codes:

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

1.2. If Motor Control Module (MCM) SPN 625/FMI 9 is present, repair the Controller Area Network (CAN) line faults.

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 ServiceLink to determine which 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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