Powertrain, generic (extended)

P2B07 Cylinder 8 Injection Pulse Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2B07 closes the warm-running row at cylinder 8, and the engine-wide check counting missed pulses over all cylinders is P2B96. No manufacturer documents P2B07 publicly as a separate monitor; GM's 2025 V8 tables mention it only in the code lists of shared calibration tables, while their cylinder 8 warm faults run as P10B1/P10B2. If a scan tool still shows P2B07, the logic matches the GM principle: injector coil voltage is sampled, and a missing opening trace means the pulse was not delivered. On many V8 designs cylinder 8 sits at the rear of a bank, close to the bulkhead and hot exhaust parts, so look at harness heat damage as well as the injector itself. Cold start: P2B0F.

Likely causes

Cylinder 8 injector not opening properly
Heat-damaged harness section at the rear of the engine
Loose or corroded injector 8 connector

Symptoms

  • Check engine light
  • Misfire on cylinder 8 (P0308), especially at 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 8injector wiringengine control module

Related codes

P2B0FP2B06P2B96P02F5P0208P0308

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