Powertrain
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Lights the check engine lamp
P2CF8: Engine Coolant Bypass Valve D Control Circuit Driver Current/Temperature Too High
Standardized SAE J2012 code · P2Cxx codes
What does P2CF8 mean?
The output driver for the engine coolant bypass valve D actuator reports current or junction temperature above its protection threshold. Stalled actuator or short to ground.
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 Bypass actuator mechanically jammed
- Medium Control wire shorted to ground
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2CF8 on the same make and model first.
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