P0265
Cylinder 2 Injector Circuit High
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The P0265 code means the PCM has detected higher-than-expected voltage in the cylinder 2 fuel injector circuit. The 'circuit high' designation indicates an electrical fault — most commonly a short to battery voltage in the wiring harness, a fuel injector with an open or high-resistance coil, or a malfunctioning PCM driver.
When the injector circuit voltage is too high, the injector may either fire continuously (causing fuel flooding on that cylinder) or not fire at all if the coil is open. Either condition results in a misfire on cylinder 2, causing rough running, vibration, and poor performance. The Check Engine Light will typically illuminate, and may flash if the misfire is severe enough.
Diagnosis should begin with a visual inspection of the wiring and connector for the cylinder 2 injector. Look for melted insulation, wires rubbing against metal engine components, or corroded pins. Use a multimeter to check the injector coil resistance — if it reads significantly higher than specification or as an open circuit, the injector needs replacement. This is a relatively affordable repair, especially if the cause turns out to be a wiring issue or the injector itself.
Severity
Symptoms
- •Engine misfires or runs rough
- •Check Engine Light is on or flashing
- •Reduced engine power and sluggish acceleration
- •Rough idle that may cause the vehicle to vibrate
- •Increased fuel consumption
Likely Causes
Damaged wiring insulation that contacts a nearby power source creates a short to battery voltage, causing the cylinder 2 injector circuit to read above the PCM's expected voltage range.
An injector with an open coil or excessively high resistance causes the voltage in the circuit to read higher than normal. The injector may fail to open or fire intermittently.
If the PCM's internal driver transistor for cylinder 2 is stuck on or not properly switching, the injector may receive continuous voltage, and the PCM detects a high circuit condition.
Connector pins with significant corrosion can create a high-resistance connection that causes voltage readings to appear elevated, especially under load when current flow increases.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Repair shorted or damaged wiring in the cylinder 2 injector circuit
- Replace the cylinder 2 fuel injector
- Clean and repair corroded connector pins
- Test and, if necessary, replace the PCM