U350FControl Module Cooling Fan Circuit Range/Performance
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U350F means the fan circuit is electrically sound but the fan does not do what it is told: its speed feedback disagrees with the command, or the module keeps heating up although the fan is switched on. Dust, a blocked or rubbing blade, worn bearings or a lost speed signal are typical. A related case is Toyota's bulletin T-SB-0021-21 for the 2021 RAV4 Prime: the charger fan's speed sensor reported no signal (P1CE931), charging took longer, and the cure was new charger software rather than a new fan. Karma fixed noise from the infotainment unit fan with a redesigned shroud (TB-24-94-01). CARB asks for a functional check of cooling performance where feasible. No maker lists U350F itself; U350C to U350E cover wiring faults.
- What you may notice
- Fan noise, rattling or whining from the module
- Module runs hot, charging or function slowed
- Code returns after clearing once the fan is commanded again
- Likely causes
- LikelyFan blade blocked by dust, debris or a deformed shroud
- PossibleWorn fan bearing slowing the fan down
- PossibleFan speed sensor signal missing or misread
- RareModule software misjudging the fan feedback (Toyota RAV4 Prime charger)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.