P2B01Cylinder 2 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
- P2B01 is stored when the ECM keeps missing the opening signature of the cylinder 2 injector in normal running, i.e. it has no proof that fuel was delivered on that cylinder's commanded pulses. GM uses the code on direct-injection petrol engines. The 2019 table for the 2.7 L L3B judges 100 failures out of 380 samples; the 2025 tables reach a verdict sooner, after 50 to 100 samples. Both are Type B with the warning lamp on the second trip. GM's preliminary information PIT5677 to PIT5677E for 2019–2021 Silverado and Sierra 1500 with the L3B lists P2B01 next to P2B00 and P2B03 among dozens of codes that a grounded, chafed engine harness can trigger. A misfire count on cylinder 2 (P0302) helps tell an injector problem from a wiring one; P2B09 is the cold-start version.
- What you may notice
- Warning lamp after two trips
- Uneven idle, possibly misfire on cylinder 2
- Together with many other codes and erratic behaviour when the harness is shorted
- Likely causes
- LikelyEngine harness shorted to ground at a chafe point (GM L3B bulletin series PIT5677)
- PossibleCylinder 2 injector opening sluggishly or not at all (deposits, worn armature)
- RareCorroded or loose injector 2 connector distorting the feedback voltage
- 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.