Powertrain
Definition only
Lights the check engine lamp
P2D66: Battery Charging System Negative Contactor C Control Circuit Range/Performance
Standardized SAE J2012 code · P2Dxx codes
What does P2D66 mean?
The negative contactor C of the battery charging system reports a control circuit range/performance 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 Coil resistance drifted
- Medium High-resistance contact in connector
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D66 on the same make and model first.
P2D66 in the community
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