P2CFABelt Integrated Starter Generator Belt Tensioner Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2CFA is logged when the control line of an electrically adjusted BISG belt tensioner reads too low, typically a ground short or a driver that holds the line down permanently. The tensioner's reaction varies with the design: Ford's patent US 9,297,445 describes an actuator that defaults to high belt tension when power is lost, which protects starts but costs efficiency, while a solenoid unit like the one in Hyundai/Kia's US 10,648,544 may rest in its spring position. No manufacturer publicly documents P2CFA. California's rules demand a circuit check on output components; in this case that means comparing the commanded state with the voltage or current returned by the driver. Chafed wiring near the hot accessory drive is a prime suspect. An open circuit is P2CF9, a high signal P2CFB.
- What you may notice
- Stop-start no longer active
- Belt noise at start or under load
- Warning lamp on
- Likely causes
- LikelyTensioner control wire chafed through to ground
- PossibleInternal short in the tensioner actuator
- RareWater or corrosion bridging pins at the actuator plug
- 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.