P2D58
Generator B Mechanical Performance
Generator B does not deliver the expected mechanical-to-electrical conversion. Bearing wear, drive coupling slip, or rotor imbalance.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Generator bearing wornCommon
- Drive coupling slipPossible
Parts involved
- Generator B
- Wiring Harness
- ECM
P2D58 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.