Powertrain, generic (extended)

P2B0D Cold Start Cylinder 6 Injection Pulse Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2B0D belongs to the cold-start family and points at cylinder 6: while the engine was splitting injections to heat the catalyst, the ECM failed to register the armature-lift voltage signature on too many of that injector's pulses. GM publishes it in the 2025 V8 table 25OBDG06A as Type B with a verdict after 50 to 100 samples. What keeps the test short is its exit list: the cold-start strategy ends once the catalyst reaches 800 °C, barometric pressure drops below 72 kPa or an extended run-time limit expires, and multi-pulse mode stops above 2,350 rpm, beyond 3 % pedal or after 100 s. No bulletin naming P2B0D was found. Warm-engine misses on cylinder 6 are P2B05; misfire on that cylinder is P0306.

Likely causes

Cylinder 6 injector opening sluggishly on short pulses when cold (deposits, worn armature)
Corroded connector or chafed wire at injector 6 distorting the feedback voltage
ECM calibration detecting the opening signature unreliably in the cold-start phase

Symptoms

  • Check engine light after two cold starts with the fault
  • Uneven idle in the first minute after a cold start, later normal

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.3–4 h

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

Parts involved

fuel injector cylinder 6injector wiringengine control module

Related codes

P2B05P2B0CP2B0EP2B95P0206P0306

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