P0264 - Cylinder 2 Injector Circuit Low
Last updated:
System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0264 is an OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM) has detected a lower than expected voltage in the fuel injector circuit for cylinder number 2. The ECM monitors the injector driver circuit for specific voltage levels. If the voltage feedback is below the calibrated threshold while the injector is commanded 'OFF' or if current draw is insufficient, the ECM interprets this as a fault. This typically indicates a short to ground in the wiring harness or a low internal resistance (short) within the injector solenoid itself.
Possible Causes
Faulty fuel injector (internal short/low resistance)
Wiring harness damage (short to ground on the signal wire)
Loose connection or corrosion in the injector 2 connector
Internal Engine Control Module (ECM) failure
Symptoms
Recommended Solution
- Visual Inspection: Check the wiring and connector for injector 2 for signs of chafing, melted insulation, or corrosion.
- Resistance Test: Disconnect the injector connector. Measure the resistance (Ohms) across the injector terminals. Expected value is usually between 10-16 Ohms. If significantly lower or near 0 Ohms, replace the injector.
- Circuit Testing: Verify 12V power supply to the injector with ignition ON. Test the signal wire to the ECM for a short to ground using a multimeter.
- Noid Light Test: Use a noid light to verify that the ECM is correctly pulsing the injector circuit while cranking.
- Component Replacement: Replace the fuel injector if electrical values are out of spec. Clear codes and perform a road test.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
Do you also have
other fault codes?
See how P0264 connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.