OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2B0B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInjector behaviour drifts at low temperature
- PossiblePoor fuel atomization at cold start
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Injector Cyl 4, Cold Start Calibration
Related codes
- P2B08Cold Start Cylinder 1 Injection Pulse Performance
- P2B09Cold Start Cylinder 2 Injection Pulse Performance
- P2B0ACold Start Cylinder 3 Injection Pulse Performance
- P2B0CCold Start Cylinder 5 Injection Pulse Performance
- P2B0DCold Start Cylinder 6 Injection Pulse Performance
- P2B0ECold Start Cylinder 7 Injection Pulse Performance
- P2B0FCold Start Cylinder 8 Injection Pulse Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.