P2B03Cylinder 4 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
- With P2B03 the engine module reports that cylinder 4 injection pulses went unconfirmed after warm-up: the coil voltage showed no proof of the armature moving. In GM's lists the code belongs to four-cylinder direct-injection engines – the three-cylinder tables end at P2B02 – and GM's 2025 four-cylinder table needs 50 to 100 samples for a Type B verdict with two trips. GM engineering information PIE0808 (Colorado/Canyon of model years 2023–2024 with 2.7 L) collects P2B03 with the offset-learning limit codes P10A9/P10AA of the same cylinder and the circuit code P02F1; steps are checking the harness near the turbo actuator, unplugging the fuel rail connector for 60 s and a 10-mile test drive. P2B03 also appears in the L3B harness bulletins. Cold start: P2B0B.
- What you may notice
- Lamp on after the second faulty trip
- Possibly misfire on cylinder 4 (P0304) or under load
- Further injector codes of the same cylinder stored at the same time
- Likely causes
- LikelyHarness chafed near the turbo actuator or elsewhere on the engine (GM 2.7 L)
- PossiblePoor contact in the fuel rail injector connector
- PossibleCylinder 4 injector worn or sticking
- 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.