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Home / DTC TRUCKS / CAT / 3406E (Prefix 5DS or 1LW) / CAT 3406E (Prefix 5DS or 1LW) Fault Code: 21 PID: 41 SPN: FMI: 4 8 Volt Supply voltage low

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 21 PID: 41 SPN: FMI: 4 8 Volt Supply voltage low

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

•The 8 volt supply is less than 7.5 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 5DS or 1LW), CAT, DTC TRUCKS Tags 1LW, 21, 3406E, 4, 41, 5DS, 8, CAT, Code, Fault, FMI, Low, or, PID, Prefix, SPN, Supply, volt, Voltage

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