P0268 Fault Code

P0268 OBD-II Trouble Code Short Description

Cylinder #3 Injector Circuit High

What does trouble code P0268 mean?

The P0268 fault code refers to a problem in the cylinder #3 injector circuit of a car's engine. This code indicates that the circuit has a higher than normal voltage, suggesting a potential issue with the fuel injector or its electrical connections.

When the injector circuit has high voltage, it can lead to various symptoms including rough idling, misfires, reduced engine performance, and increased fuel consumption. The engine control module (ECM) detects this abnormal voltage and sets the P0268 code to alert the driver or technician of the problem.

To diagnose and resolve this issue, several steps can be taken. First, the wiring and connectors associated with the cylinder #3 injector circuit should be inspected for any damage or loose connections. If any issues are found, they should be repaired or replaced.

Next, the functioning of the fuel injector itself should be tested. This involves checking the resistance of the injector to ensure it falls within the specified range. If the resistance is outside the acceptable range, the injector may need to be replaced.

Another possible cause of the P0268 code is a malfunctioning ECM. In this case, the ECM may need to be reprogrammed or replaced to resolve the issue.

It is recommended to seek assistance from a qualified mechanic or automotive technician to properly diagnose and fix the cylinder #3 injector circuit high voltage issue. They will have the necessary tools and expertise to accurately identify the root cause and perform the required repairs.


What are the symptoms of the P0268 code?

When the P0268 fault code appears in a car, it indicates that there is a high voltage condition in the cylinder #3 injector circuit. Some common symptoms associated with this fault code include:

  • Engine misfire: The engine may misfire or run roughly, especially when idle or under load.
  • Loss of power: The vehicle may experience a decrease in power and acceleration.
  • Increased fuel consumption: A faulty cylinder #3 injector circuit can cause the engine to use more fuel than usual.
  • Check Engine Light: The check engine light will illuminate on the dashboard to indicate a problem.
  • Rough idle: The engine may have a rough and unstable idle.
  • Smoky exhaust: The exhaust may emit excessive smoke or have a strong odor due to the inefficient combustion caused by the faulty injector circuit.

It is important to note that these symptoms may vary depending on the make and model of the vehicle. If you experience any of these symptoms, it is recommended to have the vehicle diagnosed and repaired by a qualified mechanic.


What causes the P0268 code?

The P0268 fault code on cars indicates a cylinder #3 injector circuit high. This means that the fuel injector circuit in cylinder #3 is experiencing higher than normal voltage levels. This can be caused by a variety of issues, including:

  1. Faulty fuel injector: A malfunctioning fuel injector in cylinder #3 can lead to an increased voltage in the circuit.

  2. Shorted wiring: A short circuit in the wiring of the fuel injector circuit can cause high voltage levels.

  3. Faulty engine control module (ECM): The ECM controls the operation of the fuel injector circuit. A faulty ECM can send incorrect signals, resulting in high voltage in the circuit.

  4. Electrical issues: Issues with the electrical connections, such as loose or corroded terminals, can affect the voltage levels in the fuel injector circuit.

  5. Fuel supply problems: Insufficient fuel supply or a clogged fuel injector can cause the injector circuit to work harder, resulting in high voltage levels.

To diagnose and fix the P0268 fault code, it is recommended to start by inspecting the electrical connectors and wiring for any damage or loose connections. If no issues are found, a professional mechanic may need to test the fuel injector and ECM to determine the exact cause of the high voltage in the cylinder #3 injector circuit.

Possible Solutions

How to fix P0268?

To fix the P0268 fault code on cars, follow these steps:

  1. Inspect the wiring: Check the wiring harness connected to the cylinder #3 fuel injector for any damage, loose connections, or corrosion. Repair or replace any damaged wires or connectors.

  2. Check the fuel injector: Test the fuel injector for proper operation. You can use a multimeter to measure the resistance across the terminals of the injector. Compare the reading to the manufacturer's specifications. If the resistance is out of range, replace the fuel injector.

  3. Test the fuel injector circuit: Use a scan tool to check the fuel injector circuit voltage. The voltage levels should be within the specified range. If the voltage is too high, inspect the fuel injector driver circuit for any faults. Replace or repair any faulty components.

  4. Check for fuel pressure issues: Low fuel pressure can cause injector circuit high faults. Test the fuel pressure using a fuel pressure gauge. If the pressure is low, inspect the fuel pump and fuel filter for any issues. Replace any faulty components.

  5. Inspect the engine control module (ECM): If all the above steps do not resolve the issue, there might be a problem with the ECM. Inspect the ECM for any signs of water damage, corrosion, or burnt components. If necessary, replace the ECM.

  6. Clear the fault code: Once the issue has been identified and resolved, use a scan tool to clear the fault code. This will reset the Check Engine Light. Take the vehicle for a test drive to ensure that the fault code does not reappear.

Note: It is recommended to consult the vehicle's service manual or seek assistance from a professional mechanic for accurate diagnosis and repair of the P0268 fault code.