P2B0DCold Start Cylinder 6 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
- P2B0D belongs to the cold-start family and points at cylinder 6: while the engine was splitting injections to heat the catalyst, the ECM failed to register the armature-lift voltage signature on too many of that injector's pulses. GM publishes it in the 2025 V8 table 25OBDG06A as Type B with a verdict after 50 to 100 samples. What keeps the test short is its exit list: the cold-start strategy ends once the catalyst reaches 800 °C, barometric pressure drops below 72 kPa or an extended run-time limit expires, and multi-pulse mode stops above 2,350 rpm, beyond 3 % pedal or after 100 s. No bulletin naming P2B0D was found. Warm-engine misses on cylinder 6 are P2B05; misfire on that cylinder is P0306.
- What you may notice
- Check engine light after two cold starts with the fault
- Uneven idle in the first minute after a cold start, later normal
- Likely causes
- PossibleCylinder 6 injector opening sluggishly on short pulses when cold (deposits, worn armature)
- PossibleCorroded connector or chafed wire at injector 6 distorting the feedback voltage
- RareECM calibration detecting the opening signature unreliably in the cold-start phase
- 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.