How much does it cost to fix P0262?

DIY repair typically costs $15–$150 for parts. Professional repair runs $100–$500 including parts and labor.

P0262

Powertrain

Moderate

Cylinder 1 Injector Circuit High

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The P0262 code means the PCM has detected higher-than-expected voltage in the cylinder 1 injector circuit. This 'circuit high' condition typically indicates an electrical problem such as a short to battery voltage in the wiring, an open or high-resistance injector coil, or a faulty PCM driver. When this occurs, the injector may fire continuously (flooding the cylinder) or not fire at all, leading to a misfire.

The most common cause is damaged wiring that has shorted to a nearby power wire, causing elevated voltage in the injector circuit. The fuel injector itself may also be failing, with its internal coil developing high resistance or an open circuit. In less common cases, the PCM's driver circuit may be malfunctioning, either staying energized or improperly reading the circuit voltage.

Diagnosis should begin with a visual inspection of the wiring harness and connector for cylinder 1's injector, looking for melted insulation, chafed wires, or corrosion. Measuring the injector coil resistance with a multimeter and comparing it to factory specifications is a quick way to determine if the injector has failed. If both the wiring and injector test good, the PCM driver may be at fault. Address this code within a few days to prevent potential catalytic converter damage from prolonged misfiring.

Severity

Moderate — Address SoonThis Week

Symptoms

•Engine misfires or runs rough
•Check Engine Light is on or flashing
•Reduced engine power and poor acceleration
•Rough idle that may shake the vehicle
•Increased fuel consumption

Likely Causes

Short to voltage in injector wiring35%

A short to battery voltage in the wiring between the PCM and the cylinder 1 injector causes the circuit to read higher than expected. This can occur from damaged insulation contacting a power wire or from incorrect wiring repairs.

Faulty fuel injector (open coil or high resistance)30%

An injector with an open or high-resistance coil will cause higher voltage readings in the circuit. As injectors age, their coils can develop increased resistance or open circuits from thermal stress.

PCM injector driver stuck on20%

If the PCM's internal transistor driver for cylinder 1 is stuck in the 'on' position or leaking voltage, the injector receives continuous power and the circuit reads abnormally high.

Corroded or damaged connector pins15%

Connector pins with increased resistance from corrosion or damage can cause the PCM to detect an abnormally high voltage in the injector circuit.