CAT 3406E (Prefix 5DS or 1LW) Fault Code: 36 PID: 84 SPN: FMI: 2 Vehicle Speed signal invalid
The ECM detects the following conditions:
•The vehicle speed signal indicates a constant MPH.
•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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