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

P0274 Cylinder 5 Injector A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0274 means the control wire of the cylinder 5 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.

Likely causes

Control wire of the cylinder 5 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 P0305
  • 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 5injector wiringengine control module

Related codes

P0273P0205P02F2P0275P0305P0300

References: gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com, saabwisonline.com.