Powertrain
Definition only
Lights the check engine lamp
P2BC9: Battery Charging System Positive Contactor B Control Circuit Low
Standardized SAE J2012 code · P2Bxx codes
What does P2BC9 mean?
The positive contactor B of the battery charging system reports a control circuit low condition. HV charging path cannot be commanded reliably.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Control wire shorted to ground
- Medium Internal short in contactor coil
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2BC9 on the same make and model first.
P2BC9 in the community
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