P2D59
Generator B Over Temperature
Generator B reports temperature above the protection threshold. Sustained high load or cooling path obstruction.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Sustained high generator loadCommon
- Cooling path blockedPossible
Parts involved
- Generator B
- Wiring Harness
- ECM
P2D59 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.