P2B02Cylinder 3 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
- P2B02 concerns cylinder 3: in warm operation the ECM did not see the voltage bump that marks the cylinder 3 injector actually opening, often enough to count pulses as not delivered. On GM's 1.2 L LIH three-cylinder, cylinder 3 is the last one, and the 2025 table for that family (cylinders 1–3 only) decides after 50 to 100 samples, Type B. GM service update A202310450 for this engine in the Encore GX (2020–2021) and Trailblazer (2021) (about 22,350 US vehicles) lists P2B02 with P2B00, P2B01 and the cold-start codes; the cure is reprogramming the ECM, not new parts. On four-cylinder engines GM also monitors cylinder 3 with this code. Cold-start faults on the same cylinder are P2B0A.
- What you may notice
- Check engine light, often without any driveability complaint
- On a real injector fault rough running on cylinder 3 (P0303)
- Likely causes
- LikelyECM calibration with false detections (GM 1.2 L LIH, service update A202310450)
- PossibleCylinder 3 injector not lifting reliably
- RareDamaged injector 3 wiring or connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.