Code result
P2CF9
Belt Integrated Starter Generator Belt Tensioner Control Circuit/Open
High severity
What it means
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?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Open in tensioner control wire
highOne of the most commonly reported causes for this code — check this first.
Open tensioner actuator
mediumA plausible cause — test and verify before replacing parts.
Pin pushed back out of connector body
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2CF9 freeNo credit card required