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Detroit Fault Codes SPN 84/FMI 4 – EPA10 – GHG14

14/12/2025
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SPN 84/FMI 4 - EPA10 - GHG14
Vehicle Speed Sensor Circuit Failed Low
NOTE: This SPN is broadcast to the Motor Control Module (MCM) via the Common Powertrain Controller (CPC).
SPN 84/FMI 4
Description Vehicle Speed Sensor Circuit Failed Low
Monitored Parameter Vehicle Speed Sensor (VSS)
Typical Enabling Conditions Always Enabled
Monitor Sequence None
Execution Frequency Always Enabled
Typical Duration 2 Seconds
Dash Lamps MIL
Verification Engine Idle (1 minute)

Check as follows:

1. Disconnect the VSS connector.

2. Disconnect the CPC #3 connector (21–pin).

3. Measure the resistance between pin 1 and pin 2 of the VSS harness connector.

3.1. If the resistance measurement is less than 5 ohms, repair the short pin 13 and pin 14 of the CPC #3 connector (21–pin).

3.2. If the resistance measurement is greater than 5 ohms, Go to step 4.

4. Measure the resistance between pin 1 of the VSS harness connector and ground.

4.1. If the resistance measurement is less than 5 ohms, repair the short to ground between pin 13 of the CPC #3 connector (21–pin) and pin 1 of the VSS harness connector.

4.2. If the resistance measurement is greater than 5 ohms, Go to step 5.

5. Measure the resistance between pin 2 of the VSS harness connector and ground.

5.1. If the resistance measurement is less than 5 ohms, repair the short to ground between pin 14 of the CPC #3 connector (21–pin) and pin 2 of the VSS harness connector.

5.2. If the resistance measurement is greater than 5 ohms, replace the VSS.

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