Wiring fault such as a short to voltage on the fan control or feedback circuit; Corroded, loose or damaged connector terminals at the fan or control module; Faulty cooling fan motor or its integral driver or electronics; Open circuit or poor ground on the fan return path, giving a false high reading; Supply voltage problem, such as a charging fault or poor battery connection; Internal fault in the control module's fan driver circuit; Outdated or faulty module software, where the manufacturer lists it as a known cause for this code.

U350E

Control Module Cooling Fan Circuit High.

Generic
Network
Generic code
Medium severity

How this code is built

U: SystemNetwork
3: Defined bySAE, the same on every car
5: AreaNetwork area 5
0E: FaultThe specific fault in that area

What it means

U350E (Generic) means a control module has seen a voltage or signal on its cooling fan circuit that is higher than expected. The module monitors the fan drive or feedback circuit, and the reading stayed above the allowed limit long enough to set the fault. Which module and fan are involved depends on the vehicle, so check the model-specific wiring information.

Symptoms

Warning light or a message about a fault in a control module or cooling system
Cooling fan running constantly, or not running at all
Module overheating or reduced performance (limp or derated operation) in some applications
Other stored codes for the same module, such as supply voltage or communication faults
Fault that comes and goes with vibration, heat or damp conditions

Possible causes

Wiring fault such as a short to voltage on the fan control or feedback circuitlikely
Corroded, loose or damaged connector terminals at the fan or control modulelikely
Faulty cooling fan motor or its integral driver or electronicspossible
Open circuit or poor ground on the fan return path, giving a false high readingpossible
Supply voltage problem, such as a charging fault or poor battery connectionpossible
Internal fault in the control module's fan driver circuitrare
Outdated or faulty module software, where the manufacturer lists it as a known cause for this coderare

How to diagnose

Read all stored and pending codes from every module, and record the freeze frame data and whether the fault is current or historic
Identify which module and fan the code relates to using model-specific wiring information
Visually inspect the fan, its wiring and connectors for chafing, heat damage, water ingress, corrosion and bent or pushed-back pins
Check the battery condition, charging voltage and main power and ground connections
Command the fan on with a diagnostic tool if supported, and see whether it runs and responds correctly
Test the fan supply, ground and control or feedback circuits with a multimeter against the wiring diagram, checking for shorts to voltage and high resistance
Wiggle-test the harness while watching live data or circuit readings to find intermittent faults
Check for manufacturer service bulletins or software updates relevant to this code and vehicle

How to fix

Repair or replace damaged wiring, and fix any short to voltage found
Clean or replace corroded or damaged connectors and terminals
Replace the cooling fan or fan assembly if it is faulty or draws abnormal current
Restore good ground and power connections, and correct any charging or battery fault
Update the module software only if the manufacturer identifies it as a known cause
Replace or repair the control module only after the wiring, fan and supply have been proven good

Can I keep driving?

Medium severity

Short, careful journeys are usually possible, but fix it soon because overheating of the module or engine can follow if the fan is not working properly. Stop driving if the temperature gauge rises, a red warning appears, or the car goes into limp mode.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.