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

P0295 Cylinder 12 Injector A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0295 means the control wire of the cylinder 12 injector is shorted to voltage. GM detects this with the driver on: on direct injection by 25 A or more through the driver, on port injection and Duramax diesels by 0.5 Ω or less to the supply. On Ford's 6.7 diesel it means the injector's high side is shorted to its low side, reported within 0.3 s. Most systems switch the warning light on in the first trip (some GM port-injection engines and Saab's 2.0 turbo after two) and shut the affected injector off, so the cylinder misfires. Ford petrol engines report all injector circuit faults as P0201 ff instead. Cylinder 12 exists only on twelve-cylinder engines; no manufacturer document using this code was found – GM and Ford documents stop at cylinder 8 – so the description follows CARB and the codes for cylinders 1–8.

Likely causes

Control wire of the cylinder 12 injector touching battery voltage or another supply wire
Injector coil shorted internally (too low resistance, overcurrent)
Short between supply and control wire in harness or connector
Driver stage in the engine module faulty

Symptoms

  • Check engine light on
  • Misfire and rough running, misfire code P0312
  • Loss of power, rough idle
  • Injector shut off, limp mode possible on diesels

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–800
Time0.5–4 h

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

Parts involved

fuel injector cylinder 12injector wiringengine control module

Related codes

P0294P0212P02F9P0296P0312P0300

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