What causes fault code P0262?

• Most likely: Short to voltage in the fuel injector wiring harness. • Likely: Faulty fuel injector (internal short or failed solenoid coil). • Possible: Corroded or loose electrical connector at the injector. • Rare: Internal failure of the Engine Control Module (ECM).

How do you fix fault code P0262?

STEP 1: Inspect the injector connector for corrosion or backed-out pins. Clean with contact cleaner if necessary. STEP 2: Use a multimeter to measure the resistance of the injector (disconnected). Standard value is typically 12-16 Ohms for high-impedance systems. An 'OL' or very high reading confirms a failed injector. STEP 3: Perform a continuity test on the wiring harness between the injector and the ECM, checking specifically for a short to 12V battery power. STEP 4: Use an oscilloscope or Noid light to verify the ECM trigger signal. STEP 5: Replace the fuel injector if electrical tests confirm it is faulty.

Powertrain (Engine & Gearbox)Standard EOBD

P0262 - Cylinder 1 Injector Circuit High

Q: What are the symptoms of fault code P0262?

• Check engine light (MIL) illuminated. • Engine misfire on cylinder 1. • Rough idling and loss of engine power. • Increased fuel consumption. • Hard starting conditions.

Last updated:1 February 2026

Related:Fuel Injector Cylinder 1, Engine Control Module (ECM), Wiring Harness, Fuel Rail

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0200

Injector Circuit Malfunction

P0201

Cylinder 1 Injector Circuit Open

P0202

Injector Circuit - Cylinder 2 - Malfunction

P0203

Injector Circuit - Cylinder 3

Technical Description

P0262 indicates that the Engine Control Module (ECM) has detected a high voltage condition in the fuel injector control circuit for cylinder 1. The ECM monitors the pulse width modulated (PWM) signal; if the voltage remains high when it should be pulled low (grounded), or exceeds predefined thresholds, the code is set. This usually points to a short to voltage in the wiring harness or a dry/failed solenoid coil within the injector itself.

Possible Causes

Short to voltage in the fuel injector wiring harness.

Faulty fuel injector (internal short or failed solenoid coil).

Corroded or loose electrical connector at the injector.

Internal failure of the Engine Control Module (ECM).

Symptoms

Check engine light (MIL) illuminated.

Engine misfire on cylinder 1.

Rough idling and loss of engine power.

Increased fuel consumption.

Hard starting conditions.

Do you also have
other fault codes?

See how P0262 connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.

Analyze multiple codes

P0262 - Cylinder 1 Injector Circuit High

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have
other fault codes?

P0262 - Cylinder 1 Injector Circuit High

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have other fault codes?

Do you also have
other fault codes?