P2B0B
Cold Start Cylinder 4 Injection Pulse Performance
During cold start, the ECM detects that the injection pulse on cylinder 4 does not produce the expected combustion result. Cold-start specific pulse calibration deviates from learned values.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Injector behaviour drifts at low temperatureCommon
- Poor fuel atomization at cold startPossible
Parts involved
- Fuel Injector Cyl 4
- Cold Start Calibration
P2B0B 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.