C15 – 0084-02 Vehicle Speed signal invalid (36)

Conditions Which Generate This Code:

The ECM detects the following conditions:
• The vehicle speed signal indicates a constant MPH.
• Engine speed is greater than 950 rpm for at least 0.06 seconds.

• The “VSL Protection” parameter is programmed to a value that is less than 2120 rpm.

System Response:
“DIAG” will be displayed next to the status for “Vehicle Speed” on the electronic service tool.

Possible Performance Effect:
Engine rpm is limited to the programmed “VSL Protection” for one hour.

Troubleshooting:
This code may indicate tampering with the vehicle speed circuit.
Perform the following diagnostic procedure: “Vehicle Speed and Speedometer Circuit – Test”

Results:
• OK – STOP.

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