P2B00Cylinder 1 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
- P2B00 says the engine module could not confirm, with the engine past its cold-start phase, that injection pulses it commanded for cylinder 1 really happened. GM documents the check for its petrol direct-injection engines: the ECM digitises the voltage across both injector wires and looks for the small flux signature the armature leaves when it lifts. If that opening trace is missing too often – 100 failures in 200 samples in the 2018 four-cylinder table, Type B, lamp after two trips – the pulse counts as lost. GM only runs it with at least 5 MPa rail pressure, 5 s engine run time and 10 % fuel in the tank. GM bulletins name P2B00 on the 2.7 L L3B (chafed engine harness) and the 1.2 L LIH (ECM software). The cold-start twin for cylinder 1 is P2B08.
- What you may notice
- Check engine light after the second faulty trip
- Rough running or misfire on cylinder 1 (P0301), sometimes no noticeable symptom
- With a harness short, several unrelated codes at once and possibly a no-start
- Likely causes
- LikelyEngine harness chafed through to ground (GM L3B – above the camshaft carrier or near the left shock tower)
- PossibleArmature or needle of the cylinder 1 injector sticking, so no opening signature appears
- PossibleOutdated ECM calibration (GM service update for the 1.2 L LIH)
- RareHigh contact resistance at the cylinder 1 injector 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.