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P0481 — Fan 2 Control Circuit Malfunction

SeriousCoolingPower derate likely — plan to stop soon

Seen on: Heavy Truck

Fan 2 Control Circuit Malfunction. Common causes: Secondary fan control circuit fault.

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How serious is it?

Serious. Power derate likely — plan to stop soon.

Most likely causes

Secondary fan control circuit fault
Failed solenoid
wiring fault

First moves (roadside)

Test secondary fan solenoid
verify control circuit continuity

FAQ

What does P0481 mean?

Fan 2 Control Circuit Malfunction. Common causes: Secondary fan control circuit fault.

How serious is P0481?

Serious — Power derate likely — plan to stop soon.

What's the most likely cause of P0481?

The most common cause is: Secondary fan control circuit fault. Other possibilities include Failed solenoid; wiring fault.

Can I keep driving with P0481?

Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.

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General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.