P0494moderate severityPowertrain
Cooling Fan Speed Low
on 2003 Audi A6 3.0L V6 · AWD
What this code means
The PCM has detected that the cooling fan speed is lower than expected. Reduced fan speed can cause the engine to overheat under load.
Symptoms
- Engine overheating
- Slow-running cooling fan
- Poor AC cooling
Common causes
- Failing cooling fan motor
- Faulty fan control module
- Poor power or ground connection
- Damaged wiring
Diagnostic steps
- Scan for stored codes
- Monitor actual fan speed data
- Check fan power and ground
- Test fan motor and module
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16501
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16515
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