P0480 — Fan 1 Control Circuit Malfunction
What it means: Fan 1 Control Circuit Malfunction.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Test fan solenoid resistance
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Baltimore, MD
Closest first. Tell them P0480 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Baltimore, MD · (443) 680-6789
- 0.0 mi away — based in Baltimore, MD · (410) 544-3888
- 24 hour Mobile Diesel Truck Engine Repair DEF Repairs On Site Services Road Service Laptop Diagnostic Tractors & Dump Truck☎ Call0.0 mi away — based in Baltimore, MD · (443) 591-3631
Seen on: Heavy Truck
What P0480 means
Fan 1 Control Circuit Malfunction. Common causes: Primary fan control circuit fault.
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.
Related codes
Codes that commonly appear alongside P0480, or share the same subsystem.
- Coolant level — low (SPN 111 FMI 1)
- Engine Coolant Temperature — Too High (SPN 110 FMI 0)
- Coolant temp sensor — voltage high (SPN 110 FMI 3)
- Coolant temp sensor — voltage low (SPN 110 FMI 4)
- Coolant temperature — moderately high (SPN 110 FMI 16)
- Engine Coolant Over-Temperature Condition (P0217)
- Coolant Thermostat Below Regulating Temperature (P0128)
- Fan 2 Control Circuit Malfunction (P0481)
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.