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

P0202 Cylinder 2 Injector A Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0202 reports an electrical fault, mainly an open circuit, in the injector circuit of cylinder 2. The engine module watches each injector output: GM flags an open circuit at an impedance of 200 kΩ or more – on direct injection and diesel engines in 10 of 20 or 5 of 10 samples and with the warning light in the first trip, on some port-injected engines only after two trips. Ford's port injection reads a fault bit from the driver chip that covers open, short to ground and short to voltage alike; Ford diesels report only the open circuit here and shorts as P0264/P0265. On GM's 3.0 litre LM2 diesel a broken pin in the injector 2 connector set P0202, sometimes with P0216.

Likely causes

Connector at the cylinder 2 injector loose, corroded or with a broken or pushed-back pin
Injector coil open
Wire between module and injector open or chafed (heat, rodents)
Injector supply missing (fuse, relay) – then usually several cylinders at once
Driver stage in the engine module faulty

Symptoms

  • Check engine light on
  • Misfire and rough running, misfire code P0302
  • Loss of power, rough idle
  • Limp mode possible on diesel and direct injection

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–700
Time0.5–4 h

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

What to check first

  1. Inspect the injector connector
  2. Measure injector resistance
  3. Check for power and switching at the connector

Parts involved

fuel injector cylinder 2injector wiringengine control module

Related codes

P0264P0265P02EFP0302P0300P020B

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