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

Categories 3406E (Prefix 1MM or 2WS), CAT, DTC TRUCKS Tags 1MM, 2WS, 3406E, 36, 8, 84, CAT, Code, Fault, FMI, of, or, Out, PID, Prefix, Range, signal, Speed, SPN, Vehicle

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