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Home / DTC TRUCKS / CAT / 3406E (Prefix 1MM or 2WS) / CAT 3406E (Prefix 1MM or 2WS) Fault Code: 31 PID: SPN: 84 FMI: 1 Vehicle Speed loss of signal

CAT 3406E (Prefix 1MM or 2WS) Fault Code: 31 PID: SPN: 84 FMI: 1 Vehicle Speed loss of signal

The ECM detects the following conditions:

•The vehicle speed signal indicates that the vehicle speed is 0 MPH.
•Desired engine speed is greater than the programmed “VSL Protection”.
•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 1, 1MM, 2WS, 31, 3406E, 84, CAT, Code, Fault, FMI, Loss, of, or, PID, Prefix, signal, Speed, SPN, Vehicle

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