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CAT 3406E (Prefix 1MM or 2WS) Fault Code: 36 PID: SPN: 84 FMI: 8 Vehicle Speed signal out of range

The Engine Control Module (ECM) detects the following conditions:

•The vehicle speed signal indicates that vehicle speed is greater than 127.5 MPH for more than two seconds.
•The “VSL Protection” parameter is programmed to a value that is less than 2120 rpm.

Probable Causes:

1) Fuel system restriction (Uncommon, but possible)
2) If speedometer is not accurate, then ECM is not programmed correctly
3) Vehicle speed sensor
4) Vehicle speed sensor wiring
5) ECM Connection/Harness
6) Speedometer failure
7) ECM Failure

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