CAT 3406E (Prefix 5DS or 1LW) Fault Code: 21 PID: 41 SPN: 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

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 14 PID: 122 SPN: FMI: 6 Med/High Retarder current high

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 14 PID: 122 SPN: FMI: 5 Med/High Retarder current low

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 14 PID: 121 SPN: FMI: 6 Low/High Retarder current high

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 14 PID: 121 SPN: FMI: 5 Low/High Retarder current low

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