Powertrain, generic (extended)

P2B96 Injection Pulse Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2B96 is the engine-wide check, outside the cold-start phase, that injectors on a direct-injection petrol engine really open when commanded. The module digitises the voltage across each injector and looks for the small kink the moving armature leaves; if commanded pulses repeatedly show no opening, it assumes fuel was not delivered. GM's 25OBDG03A table runs this continuously in 100 ms steps as a global missing-pulse test beside the per-cylinder codes P2B00 to P2B07, Type B. GM's PIT5677 lists P2B96 among codes from chafed engine harnesses on 2019 Silverado/Sierra 1500 with the 2.7 l L3B, and the Encore GX/Trailblazer service update A202310450 cures it with ECM software. Mitsubishi files P2B96 under the injection system in its 2022 Outlander manual update. P2B95 covers the cold-start phase.

Likely causes

Engine harness chafed against underhood parts (GM 2.7 l L3B)
Engine software detecting falsely, fixed by reprogramming
Injector armature sticking or injector worn
High resistance in an injector circuit or connector

Symptoms

  • Check engine light after two drives with the fault
  • Misfire or rough running if fuel is really missing
  • Often other codes from the same harness or injector fault

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,500
Time0.3–5 h

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

Parts involved

fuel injectorsecmfuel rail

Related codes

P2B95P2B00P2B01P2B03P0300

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.