U350F code meaning
Control Module Cooling Fan Circuit Range/Performance
What U350F means
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.
U350F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U350F
- 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
Common causes of U350F
- Most likelyFan blade blocked by dust, debris or a deformed shroud
- PossibleWorn fan bearing slowing the fan down
- PossibleFan speed sensor signal missing or misread
- Less likelyModule software misjudging the fan feedback (Toyota RAV4 Prime charger)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Module cooling fan
What each part of U350F means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 0F | The exact fault in that area. |
What to do next
- Note U350F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U350F
What does U350F mean?
U350F means "Control Module Cooling Fan Circuit Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U350F?
Drive gently and only to a workshop. With U350F the car can go into limp mode (reduced power) to protect itself.
Will U350F fail an emissions test?
U350F is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U350F to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U350F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.