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Home / DTC TRUCKS / CAT / 3406E (Prefix 1MM or 2WS) / CAT 3406E (Prefix 1MM or 2WS) Fault Code: 21 PID: SPN: 41 FMI: 3 8 Volt Supply voltage high

CAT 3406E (Prefix 1MM or 2WS) Fault Code: 21 PID: SPN: 41 FMI: 3 8 Volt Supply voltage high

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

•The 8 volt supply is more than 8.5 VDC for more than one second.
•The ECM has been powered for more than three seconds.

Probable Causes:

1) ECM Connection/Harness
2) Accelerator Position Sensor
3) Accelerator Position Sensor Harness
4) ECM Failure

Categories 3406E (Prefix 1MM or 2WS), CAT, DTC TRUCKS Tags 1MM, 21, 2WS, 3, 3406E, 41, 8, CAT, Code, Fault, FMI, High, or, PID, Prefix, SPN, Supply, volt, Voltage

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