Powertrain
Definition only
Lights the check engine lamp
P2D77: Battery Charger Control Module B Performance
Standardized SAE J2012 code · P2Dxx codes
What does P2D77 mean?
The battery charger control module B reports a performance fault. Internal self-tests fail or response time outside calibration.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
- High Internal module fault
- Medium Communication with BMS degraded
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D77 on the same make and model first.
P2D77 in the community
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