P2CF9
Belt Integrated Starter Generator Belt Tensioner Control Circuit/Open
The control circuit of the belt-integrated starter/generator (BISG) belt tensioner reports a control circuit/open 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.
- Open in tensioner control wireCommon
- Open tensioner actuatorPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Bisg Belt Tensioner
- Wiring Harness
- Hybrid Control Module
P2CF9 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.