P2D51
Air Assisted Injector Control Circuit
The control circuit of the air-assisted fuel injector reports a generic fault. Air-assist atomization for cold-start or low-load conditions cannot be commanded.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Wiring or connector faultCommon
- Air-assist actuator failedPossible
Parts involved
- Air Assisted Injector
- Wiring Harness
- ECM
P2D51 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.