OBD-II code · Powertrain (generic, extended)
P2CF8 Engine Coolant Bypass Valve D Control Circuit Driver Current/Temperature Too High
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.
Is it safe to drive with P2CF8?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBypass actuator mechanically jammed
- PossibleControl wire shorted to ground
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Engine Coolant Bypass Valve D, Ecm
Related codes
- P2CF5Hybrid/EV Battery Pack Coolant Pump B Stuck/Stalled
- P2CF6Hybrid/EV Battery Pack Coolant Pump B Overspeed /Air in System
- P2CF7Hybrid/EV Battery Pack Coolant Pump B Underspeed
- P2CF9Belt Integrated Starter Generator Belt Tensioner Control Circuit/Open
- P2CFABelt Integrated Starter Generator Belt Tensioner Control Circuit Low
- P2CFBBelt Integrated Starter Generator Belt Tensioner Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.