Powertrain
Definition only
Lights the check engine lamp
P2AFE: Engine Coolant Temperature Sensor 4 Circuit Low
Standardized SAE J2012 code · P2Axx codes
What does P2AFE mean?
Voltage on the engine coolant temperature 4 sensor signal line is below the expected window. Wire shorted to ground or sensor short.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Common causes
- High Signal wire shorted to ground
- Medium Internal sensor short
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2AFE on the same make and model first.
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