P2DD6
Fuel Injection Quantity B Higher Than Expected
The measured fuel injection quantity for group B is above the calibrated window. Injector flow drift, rail pressure off, or measurement bias.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Injector leakingCommon
- Fuel rail pressure highPossible
Parts involved
- Fuel Injector Group B
- Fuel Rail
- ECM
P2DD6 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.