P2B0F closes the cold-start series with cylinder 8, so it only appears on eight-cylinder engines; publicly GM documents it, in table 25OBDG06A for its 2025 V8 family (Type B, two trips, 50 to 100 samples). The ECM reads the voltage across the injector enable and command wires and treats a pulse as undelivered when no opening magnitude shows up during catalyst heating. The same table watches cylinder 8 in other ways too: the warm-running pulse check P2B07 and GM's own codes P10B1 and P10B2, which set when the total small-pulse compensation of that injector falls below or rises above its limit. One enabling condition is that the enrichment for brand-new engines is no longer active. No service bulletin naming P2B0F was found.
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 8 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Check engine light, frequently without driveability complaints
- With a real injector fault, rough cold idle and possibly misfire on cylinder 8 (P0308)
Most likely causes
- Needle or armature of the cylinder 8 injector sticking on cold short pulses
- Loose or corroded connector at injector 8
- Chafed injector harness on the bank carrying cylinder 8
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 P2B0F means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- B: Subsystem depends on the code range
- 0F: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2B0F?
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 P2B0F?
The most common causes are: needle or armature of the cylinder 8 injector sticking on cold short pulses; loose or corroded connector at injector 8; chafed injector harness on the bank carrying cylinder 8.
Related codes
- P2B07Cylinder 8 Injection Pulse Performance
- P2B0ECold Start Cylinder 7 Injection Pulse Performance
- P2B95Cold Start Injection Pulse Performance
- P2B96Injection Pulse Performance
- P0208Cylinder 8 Injector A Circuit/Open
- P0308Cylinder 8 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.