P0480 — Fan 1 Control Circuit Malfunction
Seen on: Heavy Truck
Fan 1 Control Circuit Malfunction. Common causes: Primary fan control circuit fault.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Primary fan control circuit fault
- Failed fan clutch solenoid
- wiring fault
First moves (roadside)
- Test fan solenoid resistance
- check relay and fuse
- replace solenoid if out of spec
FAQ
Fan 1 Control Circuit Malfunction. Common causes: Primary fan control circuit fault.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Primary fan control circuit fault. Other possibilities include Failed fan clutch solenoid; wiring fault.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
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.