Powertrain, generic · Fuel and air metering (injector circuit)

P02F6 Cylinder 9 Injector Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P02F6 reports an electrically implausible response of the cylinder 9 injector – not an open or short circuit (those are P0209, P0285 and P0286), but a current or voltage pattern outside the expected range. Cylinder 9 exists only on engines with ten or more cylinders; GM and Ford documents stop at cylinder 8, so the description follows CARB and the documented checks for cylinders 1–8 (current fall time, voltage feedback, regulator at its limit). The injector may be shut off, causing misfire.

Likely causes

Injector electrically aged (piezo capacitance, coil resistance)
Contact resistance in the injector 9 connector or wiring
Injector mechanically sticking (valve lift)
Injector driver stage in the engine module

Symptoms

  • Check engine light on
  • Rough running, misfire on cylinder 9
  • Loss of power, smoke (diesel)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time1–4 h

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

Parts involved

fuel injector cylinder 9injector wiringengine control module

Related codes

P0209P0285P0286P0287P02F7P0309

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