U350E code meaning
Control Module Cooling Fan Circuit High
What U350E means
U350E points to a fan circuit whose level is higher than the module expects, typically because the control or feedback line is shorted to battery voltage or the output stage is stuck on. Unlike the low and open faults, the fan may then run all the time, even with the module cold or the car parked, which is audible and can drain the 12 V battery. Fan-cooled electronics are found in infotainment units such as the central unit of the Karma Revero (TB-24-94-01) and in on-board chargers; CARB treats electrical cooling outputs for inverters and batteries as monitored components. U350E is not documented by any manufacturer in public. Check the harness for chafing against supply wires before suspecting the module.
U350E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U350E
- Module fan running continuously, also after switch-off
- 12 V battery discharged after standing
- Fan does not react to temperature changes
Common causes of U350E
- Most likelyFan control or feedback wire shorted to a 12 V supply
- PossibleFan output stage in the module stuck on
- Less likelyMoisture or corrosion bridging pins in the fan connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Module cooling fanFan wiring
What each part of U350E means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 0E | The exact fault in that area. |
What to do next
- Note U350E 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 U350E
What does U350E mean?
U350E means "Control Module Cooling Fan Circuit High". U350E points to a fan circuit whose level is higher than the module expects, typically because the control or feedback line is shorted to battery voltage or the output stage is stuck on. It is a generic code, so it means the same on every make.
Is it safe to drive with U350E?
U350E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U350E fail an emissions test?
U350E 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 U350E to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U350E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.