P0264
Cylinder 2 Injector Circuit Low
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The P0264 code indicates the PCM has detected lower-than-expected voltage in the electrical circuit controlling the cylinder 2 fuel injector. This circuit-level fault means there's an electrical issue preventing the injector from receiving its normal operating signal, which can result in that cylinder not firing properly or at all.
This is one of the more straightforward diagnostic codes because the fault is isolated to a specific cylinder's injector circuit. Start by inspecting the electrical connector at the cylinder 2 fuel injector — look for corrosion on the pins, a loose fit, or signs of heat damage. Then trace the wiring harness from the injector back toward the PCM, checking for chafed or damaged insulation. Measuring the injector coil resistance with a multimeter will tell you if the injector itself is faulty.
If the connector and wiring are in good condition, the injector is the most likely culprit. Fuel injectors are generally easy to access and replace on most vehicles, making this a good candidate for a DIY repair. If the injector and wiring both test good, the issue may be with the PCM's driver circuit, which requires professional diagnosis.
Severity
Symptoms
- •Engine misfires or runs rough, especially at idle
- •Noticeable loss of power during acceleration
- •Check Engine Light is on or flashing
- •Poor fuel economy
- •Rough or uneven idle with possible stalling
Likely Causes
A loose, corroded, or damaged electrical connector at the cylinder 2 fuel injector is the most common cause. Engine vibration and heat cycling gradually degrade connections, creating high resistance or intermittent contact.
The wiring from the PCM to the cylinder 2 injector can short to ground due to chafing, heat damage, or rodent damage. This pulls the circuit voltage below the PCM's expected range.
An internal short in the injector solenoid coil reduces its resistance below specification, causing the PCM to detect excessive current draw and flag a low-circuit condition.
The PCM's internal transistor driver that controls the cylinder 2 injector may be leaking current to ground, producing a false low-circuit reading.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean and reseat the cylinder 2 fuel injector electrical connector
- Repair or replace damaged wiring in the injector circuit
- Replace the cylinder 2 fuel injector
- Test and verify the PCM injector driver output