P0264 Fault Code

P0264 OBD-II Trouble Code Short Description

Cylinder #2 Injector Circuit Low

What does trouble code P0264 mean?

P0264 is a generic OBD-II code that indicates a problem with the cylinder #2 injector circuit. This code specifically states that the voltage or resistance in the circuit for the fuel injector in cylinder #2 is too low.

The fuel injector is responsible for delivering fuel to the combustion chamber. When the engine control module (ECM) detects a low voltage or resistance in the injector circuit, it means there may be an issue with the injector itself, the wiring, or the ECM.

There are several potential causes for this code, including a faulty fuel injector, a problem with the wiring or connectors, a clogged or leaking fuel injector, or a malfunctioning ECM. It's also possible that a problem with the fuel pressure or fuel delivery system is affecting the injector.

To diagnose and resolve the issue, it is recommended to follow these steps:

  1. Inspect the wiring and connectors for any signs of damage or loose connections. Repair or replace as necessary.
  2. Check the fuel injector for any clogs or leaks. If found, clean or replace the injector.
  3. Test the fuel injector for proper function using a specialized tester. Replace the injector if it fails the test.
  4. Verify the fuel pressure and delivery system are functioning correctly.
  5. If no issues are found with the above steps, the problem may lie with the ECM. In this case, further diagnostics may be required to determine the exact cause and repair.

It is important to note that diagnosing and repairing P0264 should be done by a qualified technician who has the proper tools and knowledge. They will be able to accurately pinpoint the cause of the fault and perform the necessary repairs or replacements to resolve the issue.


What are the symptoms of the P0264 code?

The P0264 fault code indicates a low voltage condition in the fuel injector circuit of cylinder #2. This can lead to various symptoms in cars, including:

  • Engine misfires: A noticeable shaking or vibration may occur when the engine is running, especially during acceleration or at higher speeds.

  • Rough idle: The engine may have an unstable or rough idle, causing the vehicle to shake or vibrate when stopped.

  • Loss of power: There may be a decrease in engine power, resulting in reduced acceleration or difficulty in maintaining speed.

  • Decreased fuel efficiency: The vehicle may experience decreased fuel efficiency, with increased fuel consumption per mile traveled.

  • Check Engine Light (CEL) on: The vehicle's onboard diagnostic system detects the fault and illuminates the CEL to alert the driver of an issue.

  • Hesitation or stumbling: The engine may hesitate or stumble during acceleration, causing a brief loss of power.

It is important to address this fault code promptly as continued driving with a faulty injector can lead to engine damage and further complications. It is recommended to have a qualified mechanic diagnose and repair the issue to ensure proper functioning of the fuel injector circuit in cylinder #2.


What causes the P0264 code?

P0264 indicates a problem with the cylinder #2 injector circuit being too low. This code is commonly caused by:

  1. Faulty injector: A malfunctioning or clogged injector may result in insufficient fuel delivery to cylinder #2.

  2. Wiring issues: Damaged or loose wiring connections between the injector and the engine control unit (ECU) can cause low circuit voltage.

  3. Faulty ECU: If the ECU responsible for controlling the injector circuit is faulty, it may not provide the correct signal or voltage to the injector.

  4. Poor electrical connection: Loose or corroded electrical connections can interrupt the proper flow of current, leading to low circuit voltage.

  5. Fuel delivery issues: Low fuel pressure or a restricted fuel filter can cause inadequate fuel supply to the injector.

To diagnose and repair the P0264 fault code, perform the following steps:

  1. Inspect the injector and its wiring for any visible damage or signs of clogging. Clean or replace the injector if necessary.

  2. Check the wiring connections between the injector and the ECU. Ensure they are secure and free from corrosion or damage.

  3. Test the injector and its circuit using a multimeter to measure voltage and resistance. Compare the readings with manufacturer specifications.

  4. If the problem persists, check the fuel delivery system for any issues, such as low fuel pressure or a clogged fuel filter.

  5. If all else fails, consider seeking professional help from a mechanic or dealership to accurately diagnose and repair the issue.

Remember to clear the fault code after making any repairs to see if it reoccurs.

Possible Solutions

How to fix P0264?

To fix the P0264 fault code, which indicates a low circuit condition in cylinder #2 injector, follow these steps:

  1. Check the electrical connections: Inspect the injector harness and connection to ensure there are no loose or damaged wires. If any issues are found, repair or replace as necessary.

  2. Test the injector: Use a multimeter to check the resistance of the cylinder #2 injector. Compare the readings with the manufacturer's specifications. If the resistance is outside the acceptable range, replace the injector.

  3. Inspect the fuel system: Check the fuel pressure and flow to ensure they are within the specified range. A clogged fuel filter or a failing fuel pump can cause low injector circuit voltage. If any issues are found, address them accordingly.

  4. Check the engine control module (ECM): Inspect the ECM for any signs of damage or water ingress. If there are any visible issues, repair or replace the ECM.

  5. Check the engine grounds: Ensure that all engine grounds are clean, tight, and properly connected. Poor grounding can cause low voltage to the injectors. Clean or repair any corroded or loose connections.

  6. Perform a test drive: Clear the fault codes from the ECM and take the vehicle for a test drive to see if the P0264 code returns. If it does not reappear, the issue may have been resolved. If the code reappears, further diagnosis may be necessary.

Remember to consult the vehicle's service manual or seek professional assistance if you are not confident in performing these steps yourself.