Powertrain
Definition only
Lights the check engine lamp
P2D57: Generator B Control Circuit Range/Performance
Standardized SAE J2012 code · P2Dxx codes
What does P2D57 mean?
The control circuit of generator B reports a range/performance condition. Generator response or feedback outside calibration.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Feedback signal 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 P2D57 on the same make and model first.
P2D57 in the community
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