What this code means

Component / fault: Aftertreatment fuel pressure control.
Reported detail: ARD solenoid current abovenormal.
FMI 5 in the SAE J1939 / Caterpillar CDL convention means: Current below normal or open circuit — see the full FMI reference table.

On a Caterpillar display this code may appear as MID/CID 333 with FMI 5, or in the older PID/SID style. Wording of the reported detail follows the public Caterpillar fault-code listing cited below.

First checks (general, for this failure type)

Circuit current is below normal or open. Check the connector is fully seated, test wire continuity end to end, and measure the coil / solenoid resistance.

These are general electrical checks for FMI 5 faults, not a substitute for the model-specific test procedure. If the fault is active and the machine is derated or shut down, follow the service manual for your model and serial prefix.

Need the part?

If the checks point to a failed sensor, solenoid or harness part, send us the code (333 / FMI 5), the machine model and serial number — we quote genuine and OEM replacement parts for export.

Same component, other failure modes

FMI 6