P0694 — Fan Control Circuit High
What it means: Fan Control Circuit High.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Check fan clutch solenoid circuit
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 P0694 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 P0694 means
Fan Control Circuit High. Common causes: Fan control circuit stuck high.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Fan control circuit stuck high
- Failed fan clutch
- wiring shorted high
First moves (roadside)
- Check fan clutch solenoid circuit
- test fan operation
- replace clutch if stuck engaged
FAQ
Fan Control Circuit High. Common causes: Fan control circuit stuck high.
Caution — Limp to the next safe stop.
The most common cause is: Fan control circuit stuck high. Other possibilities include Failed fan clutch; wiring shorted high.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P0694, 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.