P0481 — Fan 2 Control Circuit Malfunction
What it means: Fan 2 Control Circuit Malfunction.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Test secondary fan solenoid
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Houston, TX
Closest first. Tell them P0481 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 Houston, TX · (832) 377-0578
- 0.0 mi away — based in Houston, TX · (713) 219-9090
- 0.0 mi away — based in Houston, TX · (713) 671-9751
Seen on: Heavy Truck
What P0481 means
Fan 2 Control Circuit Malfunction. Common causes: Secondary fan control circuit fault.
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
Fan 2 Control Circuit Malfunction. Common causes: Secondary fan control circuit fault.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Secondary fan control circuit fault. Other possibilities include Failed 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 P0481, 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 1 Control Circuit Malfunction (P0480)
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.