P2B0FCold Start Cylinder 8 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
- 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 One enabling condition is that the enrichment for brand-new engines is no longer active.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.
- What you may notice
- Check engine light, frequently without driveability complaints
- With a real injector fault, rough cold idle and possibly misfire on cylinder 8 (P0308)
- Likely causes
- PossibleNeedle or armature of the cylinder 8 injector sticking on cold short pulses
- PossibleLoose or corroded connector at injector 8
- RareChafed injector harness on the bank carrying cylinder 8
- 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.