Network
generic or reserved
U350C
Control Module Cooling Fan Circuit/Open
Open circuit at the control module cooling fan (used to keep heavy ECUs like ADAS compute or inverter controllers within thermal limits).
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 0C
Possible causes
- Fan motor open high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: module cooling fan
- Component: fan wiring
- MIL / check engine light
Sources
References
sae:J2012