CAT 3406E (Prefix 1MM or 2WS) Fault Code: 21 PID: SPN: 232 FMI: 4 5 Volt Supply voltage low

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

•The 5 volt supply is less than 4.84 VDC for more than one second.
•The ECM has been powered for at least three seconds.

Sensors that are regulated with 5V: Boot pressure, atmosphere pressure, engine oil pressure, coolant temperature, intake manifold air temperature, fuel temperature

Probable Causes:

1) ECM Connection/Harness
2) Sensor Failure
3) Sensor wiring failure
4) ECM Failure

Categories 3406E (Prefix 1MM or 2WS), CAT, DTC TRUCKS Tags 1MM, 21, 232, 2WS, 3406E, 4, 5, CAT, Code, Fault, FMI, Low, or, PID, Prefix, SPN, Supply, volt, Voltage

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