P2B09Cold Start Cylinder 2 Injection Pulse Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2B09 reports that while the catalyst is being warmed after a cold start the ECM missed the opening trace of injector 2 on too many commanded pulses. CARB defines the window: at least six hours engine-off, ambient at or above −6.7 °C and coolant no more than 15 °C warmer than ambient. GM already ran the test in 2019 on the 2.7 L L3B, setting it after 100 failures in 380 samples, Type B. For 2021 Malibu, Equinox and Terrain (LYX and LFV engines) GM bulletin 20-NA-230 lists P2B08–P2B0B with P2B95 as a software anomaly: vehicles built before 2 December 2020 get the current calibration, then codes are cleared and a cold start is repeated. If P2B09 comes back, normal diagnosis follows; the warm-engine code is P2B01.
- What you may notice
- Check engine light after cold starts on two trips
- Usually no driveability issue once the engine is warm
- Likely causes
- LikelyOutdated ECM calibration (GM bulletin 20-NA-230)
- PossibleCylinder 2 injector not responding to the short cold-start pulses
- RareWiring or connector problem on injector 2
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.