P2B03
Cylinder 4 Injection Pulse Performance
The ECM detects that the injection pulse on cylinder 4 does not produce the expected combustion result. Pulse width, timing, or quantity drift compared to the bank average.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Injector aged - flow characteristic driftedCommon
- Fuel quality affecting injection resultPossible
Parts involved
- Fuel Injector Cyl 4
- ECM
P2B03 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.