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.
Affected components
- Bisg belt tensioner
- Wiring harness
- Hybrid control module
Common causes
- High likelihood: Control wire shorted to ground
- Medium likelihood: Internal short in actuator
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.