P0262 — Cylinder 1 Injector A Circuit High

P0262: Cylinder 1 Injector A Circuit High — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Cylinder 1 Injector A Circuit High. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Check Engine light illumination
  • Engine misfire at idle or under load
  • Noticeable loss of engine power
  • Increased fuel consumption
  • Rough engine operation

Possible causes

  • Faulty fuel injector for cylinder 1
  • Short circuit in the wiring harness to the injector
  • Damaged or corroded injector connector
  • Internal fault in the Engine Control Module (ECU)
  • Frayed or grounded wiring insulation

What to check

  • Inspect the electrical connector at the cylinder 1 injector for corrosion or loose pins
  • Measure the resistance of the cylinder 1 injector using a multimeter to check for internal shorts
  • Verify the wiring harness continuity between the injector and the ECU
  • Check for voltage supply and ground signals at the injector connector using a test light or oscilloscope
  • Examine the ECU injector driver circuit for signs of internal failure

Also written as: P0262-00, P026200, PO262 (some scan tools add the fault-type byte, e.g. -00).