OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2CF9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in tensioner control wire
- PossibleOpen tensioner actuator
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Bisg Belt Tensioner, Wiring Harness, Hybrid Control Module
Related codes
- P2CF6Hybrid/EV Battery Pack Coolant Pump B Overspeed /Air in System
- P2CF7Hybrid/EV Battery Pack Coolant Pump B Underspeed
- P2CF8Engine Coolant Bypass Valve D Control Circuit Driver Current/Temperature Too High
- P2CFABelt Integrated Starter Generator Belt Tensioner Control Circuit Low
- P2CFBBelt Integrated Starter Generator Belt Tensioner Control Circuit High
- P2CFCA/C Clutch Control Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.