Cylinder 2 Injector Circuit Low
P0264 indicates the PCM detected low voltage in the fuel injector circuit for cylinder 2, meaning the injector isn't receiving sufficient electrical signal to spray fuel properly. This causes a lean mixture in that cylinder, triggering the check engine light and degrading engine performance and fuel economy.
What You Might Notice
- Check engine light illuminated
- Rough idle or uneven engine running
- Loss of engine power
- Significant reduction in fuel economy
- Engine hesitation during acceleration
Most Common Causes
- 1
Dirty or clogged fuel injector
Carbon buildup or fuel residue in the cylinder 2 injector reduces spray pattern and electrical conductivity, causing low voltage detection by the PCM.
- 2
Faulty fuel injector
The cylinder 2 injector coil has failed or developed internal resistance, preventing proper electrical current flow and voltage signal to the PCM.
- 3
Corroded or damaged injector wiring
The electrical connector or wiring harness to cylinder 2 injector has corrosion, breaks, or poor connections that reduce voltage delivery.
- 4
PCM or fuel injector driver module failure
The power control module or its fuel injection control circuit has malfunctioned, preventing proper voltage output to the cylinder 2 injector.
How to Diagnose It
- 1
Check Dirty or clogged fuel injector — Carbon buildup or fuel residue in the cylinder 2 injector reduces spray pattern and electrical conductivity, causing low voltage detection by the PCM.
- 2
Check Faulty fuel injector — The cylinder 2 injector coil has failed or developed internal resistance, preventing proper electrical current flow and voltage signal to the PCM.
- 3
Check Corroded or damaged injector wiring — The electrical connector or wiring harness to cylinder 2 injector has corrosion, breaks, or poor connections that reduce voltage delivery.
- 4
Check PCM or fuel injector driver module failure — The power control module or its fuel injection control circuit has malfunctioned, preventing proper voltage output to the cylinder 2 injector.
How to Fix It
- 1
Clean fuel injector
Remove and professionally clean the cylinder 2 fuel injector using ultrasonic cleaning or fuel injector cleaning solution to remove carbon deposits and restore proper spray pattern and electrical function.
- 2
Replace fuel injector
If cleaning does not resolve the code, remove the faulty cylinder 2 injector and install a new or remanufactured fuel injector to restore proper voltage and fuel delivery.
- 3
Repair injector wiring and connectors
Inspect the fuel injector connector and wiring harness for corrosion or damage. Clean corroded connectors with electrical contact cleaner or replace damaged wiring to restore voltage signals.
- 4
Diagnose PCM or driver module
If injector and wiring are functional, have a diagnostic technician test the fuel injection driver circuit in the PCM. PCM reprogramming or replacement may be necessary.
Need a deeper diagnosis?
Search for related repair guides or browse by system.