P0493
PowertrainCooling Fanmoderate severityCooling Fan Speed
What P0493 Means
The PCM has detected that the cooling fan speed does not match the commanded value. This can lead to inadequate engine cooling.
Symptoms
- Engine overheating
- Fan running too slow or fast
- Warning lamp on
Common Causes
- Faulty cooling fan motor
- Faulty fan control module
- Damaged wiring or connector
- Faulty PCM
Diagnostic Steps
- Scan for stored codes
- Compare commanded vs actual fan speed
- Inspect fan wiring and connectors
- Test fan module and motor
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ANCEL AD410 →
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Serious DIY~$100
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Autel MaxiCOM MK808S →
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Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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