Powertrain, generic (extended)

P2B06 Cylinder 7 Injection Pulse Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2B06 is the warm-engine pulse check for cylinder 7 and so practically limited to V8 and larger engines. No manufacturer documents P2B06 publicly in its own entry. In GM's 2025 V8 tables the code appears only in the lists of a shared calibration: a pulse counts as missing when the measured opening magnitude stays below a fixed value of 75 across rail pressures from 0.4 to 24 MPa. The warm per-cylinder faults GM actually reports on that V8 are its offset-learning limits P10AF/P10B0 for cylinder 7. CARB treats the injector as an output part whose response to a command must be verified. Typical follow-up is a misfire count on cylinder 7; the cold-start sibling is P2B0E.

Likely causes

Cylinder 7 injector with weak or missing armature lift

Wiring to injector 7 damaged by heat or chafing

Rail pressure outside the plausible range, distorting the opening signal

Symptoms

Engine light on after two trips
Misfire on cylinder 7 (P0307), rough idle

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€100–1,000

Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector cylinder 7injector wiringengine control module

References: law.cornell.edu, gsi.ext.gm.com.