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.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Cylinder 7 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Warning lamp after the second faulty cold start
- Slight shaking right after a cold start, often nothing noticeable
Most likely causes
- Cylinder 7 injector not lifting on the very short split pulses (deposits, armature wear)
- Enable or command wire of injector 7 damaged, falsifying the measured voltage
- ECM software with an overly strict opening-signature evaluation
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2B0E means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- B: Subsystem depends on the code range
- 0E: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2B0E?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P2B0E?
The most common causes are: cylinder 7 injector not lifting on the very short split pulses (deposits, armature wear); enable or command wire of injector 7 damaged, falsifying the measured voltage; eCM software with an overly strict opening-signature evaluation.
Related codes
- P2B06Cylinder 7 Injection Pulse Performance
- P2B0DCold Start Cylinder 6 Injection Pulse Performance
- P2B0FCold Start Cylinder 8 Injection Pulse Performance
- P2B95Cold Start Injection Pulse Performance
- P2B96Injection Pulse Performance
- P0207Cylinder 7 Injector A Circuit/Open
- P0307Cylinder 7 Misfire Detected
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.