P2CFA
Belt Integrated Starter Generator Belt Tensioner Control Circuit Low
The control circuit of the belt-integrated starter/generator (BISG) belt tensioner reports a control circuit low condition. Belt tension cannot be modulated for assist/regen modes.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in actuatorPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Bisg Belt Tensioner
- Wiring Harness
- Hybrid Control Module
P2CFA is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.