Network
generic / SAE
U0632
Lost Communication With Fan 1
The vehicle bus reports loss of communication with smart cooling fan 1 (PWM brushless fan with own controller). Fan speed cannot be commanded; cooling falls back to default operation.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number6 / 32
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
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: shop recommended
- Estimated cost: 150–1500 €
- Estimated time: 0.5–3 h
- Component: cooling fan 1
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012