P2B0ECold Start Cylinder 7 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
- P2B0E is the cylinder 7 entry of the cold-start pulse check. On engines that fire two or three short injections per cycle while heating the catalyst, the ECM expects each of them to show an opening signature on the injector feedback voltage; for cylinder 7 too many did not. GM's 2025 V8 supporting tables (25OBDG06B) show how the pulse count is chosen: double pulses are permitted up to 3,600 rpm and triple pulses up to 3,000 rpm, depending on the injector energy profile. The summary code P2B95 adds up the share of missed pulses over all cylinders once per trip, whereas P2B0E names the single cylinder (Type B, 50 to 100 samples, table 25OBDG06A). CARB phases this split-pulse check in over model years 2026 to 2028. The warm-running counterpart is P2B06.
- What you may notice
- Warning lamp after the second faulty cold start
- Slight shaking right after a cold start, often nothing noticeable
- Likely causes
- PossibleCylinder 7 injector not lifting on the very short split pulses (deposits, armature wear)
- PossibleEnable or command wire of injector 7 damaged, falsifying the measured voltage
- RareECM software with an overly strict opening-signature evaluation
- 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.