Powertrain, generic (extended)

P2B95 Cold Start Injection Pulse Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2B95 belongs to the cold-start strategy of petrol direct-injection engines: while the catalyst is heated, each injection is split into two or more small pulses, and the module checks via the injector coil voltage that every pulse really opened the injector. Unlike P2B08 to P2B0F, which name a cylinder, P2B95 is the engine-wide verdict. GM's 2025 table 25OBDG03A runs it once per trip during the strategy (catalyst under 550 °C, coolant −12 to 66 °C, 250–3,000 rpm, under 20 s run time) and relates missed pulses to all pulses; Type B. GM bulletins 18-NA-074 (2018 Malibu 1.5 l) and 20-NA-230 (2021 Equinox, Terrain, Malibu) cure false settings with ECM software. Stellantis uses the same name for the 2019 Jeep Cherokee 2.0 turbo (18-052-20). P2B96 is the warm counterpart.

Likely causes

Engine software setting the code falsely (GM and Stellantis reflash bulletins)
Injector opening sluggishly when cold due to deposits or wear
High resistance or chafing in injector wiring
Rail pressure outside the expected range during cold start

Symptoms

  • Check engine light after two cold starts with the fault
  • Usually no noticeable effect on driving
  • Possibly rough running in the first seconds after a cold start

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.3–4 h

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

Parts involved

fuel injectorsecmfuel rail

Related codes

P2B96P2B08P2B09P2B0AP2B0B

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