P2CF9Belt Integrated Starter Generator Belt Tensioner Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2CF9 applies to belt starter-generator systems whose belt tensioner is moved by an actuator rather than by a spring alone. Patents describe the idea: Ford raises belt tension for engine starts and boost and lowers it while charging (US 9,297,445, with an actuator that falls back to high tension when unpowered); a Hyundai/Kia patent uses a solenoid with three tension stages (US 10,648,544); a later Ford patent switches an active tensioner between high and normal positions (US 12,577,903). P2CF9 means the controller sees an open or otherwise faulty drive circuit to that actuator. No carmaker has published the code; hydraulic tensioners such as on FCA eTorque have no control circuit. Possible effects: belt slip on restart, noise, disabled stop-start or assist, MIL.
- What you may notice
- Belt squeal or slip during automatic restarts
- Stop-start or electric assist disabled
- MIL or system warning on
- Likely causes
- LikelyBroken wire or loose connector in the tensioner drive circuit
- PossibleOpen coil or motor winding in the tensioner actuator
- RareOutput stage in the controlling module failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.