OBD-II code · Network (extended)
U350F Control Module Cooling Fan Circuit Range/Performance
Module cooling fan circuit electrically OK but fan does not run as commanded — bearing seized, blade obstructed, or driver weak.
Is it safe to drive with U350F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFan motor seized
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Module Cooling Fan
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.