Powertrain
Definition only
Lights the check engine lamp
P2D59: Generator B Over Temperature
Standardized SAE J2012 code · P2Dxx codes
What does P2D59 mean?
Generator B reports temperature above the protection threshold. Sustained high load or cooling path obstruction.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Sustained high generator load
- Medium Cooling path blocked
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D59 on the same make and model first.
P2D59 in the community
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