P0265 Cylinder 2 Injector Circuit Low

Troubleshooting and Fixing Cylinder 2 Injector Circuit Low Issues

If you own a car with a gasoline engine, you know that it needs fuel to run. The fuel is delivered to the engine by injectors that spray precise amounts of gasoline into each cylinder, where it is ignited by a spark plug. If one of these injectors fails or malfunctions, your engine performance will suffer, and you may even get a check engine light on your dashboard. In this article, we will focus on a specific diagnostic trouble code (DTC) related to the injector circuit of cylinder 2, which is a common problem in many cars. We will explain what the code means, what causes it, how to diagnose it, and how to fix it.

Understanding P0265

P0265 is a generic OBD-II code that indicates a low circuit condition in the injector of cylinder 2. This code is set by the engine control module (ECM) when it detects that the voltage or resistance of the circuit is lower than expected. The ECM monitors the injector circuit by sending a voltage signal to the injector and measuring the response, which should be within a certain range of values. If the response is too low, the ECM assumes that the circuit is open, shorted, or grounded, and sets the P0265 code. Other related codes may also be set, such as P0202, P2146, P2149, or P2152, depending on the vehicle make and model.

Causes of P0265

There are several possible causes of a low injector circuit condition in cylinder 2, including:

  • A faulty injector: The injector itself may be defective, clogged, or leaking, and cannot deliver enough fuel to the cylinder.
  • A damaged or corroded connector or wiring: The wires that connect the injector to the ECM may be broken, frayed, or corroded, causing a poor electrical connection or insulation.
  • A blown fuse or relay: The fuse or relay that powers the injector may be blown or faulty, preventing the injector from receiving the correct voltage or current.
  • A malfunctioning ECM: The ECM may be malfunctioning, either due to a software glitch or a hardware failure, and cannot communicate properly with the injector or other components.

Diagnosing P0265

To diagnose the P0265 code, you will need a scan tool that can read live data and freeze frame data from the ECM, as well as a multimeter and a wiring diagram for your specific vehicle. Here are some steps to follow:

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  1. Record any other codes and freeze frame data stored in the ECM, and clear the codes.
  2. Check the fuel pressure and flow, and verify that the other injectors are working correctly.
  3. Inspect the injector and its connector and wiring for any visible damage, such as corrosion or breakage.
  4. Measure the resistance and continuity of the injector circuit using the wiring diagram and the multimeter.
  5. Test the injector by applying voltage and ground to its terminals, and listening for a clicking sound or measuring the fuel flow.
  6. Check the fuse and relay that power the injector, and replace them if necessary.
  7. Test the ECM by checking its power and ground connections, and performing a diagnostic scan using a manufacturer-specific scan tool if available.

Fixing P0265

Once you have diagnosed the cause of the P0265 code, you can proceed to fix the problem. Depending on the cause, you may need to:

  • Replace the faulty injector, if it is beyond repair or cleaning.
  • Repair or replace the damaged or corroded connector or wiring, and apply some dielectric grease to protect against further corrosion.
  • Replace the blown fuse or relay with a new one of the same rating and type.
  • Replace the malfunctioning ECM, if it is under warranty or if all other options have been exhausted.


A low injector circuit condition in cylinder 2 can cause poor engine performance, reduced fuel economy, and emissions, and can lead to more serious engine problems if left untreated. By understanding the P0265 code, its causes, and its diagnostic and repair procedures, you can save time and money by avoiding unnecessary part replacements or visits to the dealership. Always follow the manufacturer’s recommendations and safety precautions when working on your vehicle, and consult a certified mechanic if you are not confident in your skills or tools.


  1. Can I drive my car with a P0265 code?
    It depends on the severity of the condition and the symptoms of your engine. If your engine misfires, stalls, or runs rough, it is not safe to drive. If the code is intermittent or if you don’t notice any difference in your engine performance, you may be able to drive for a short distance, but you should have your car inspected as soon as possible.
  2. How much does it cost to replace an injector?
    The cost of an injector replacement varies depending on the make and model of your car, as well as the location and labor rates of the mechanic. Typically, a single injector can cost between $50 and $300, and the labor can cost between $100 and $500, depending on the complexity of the job.
  3. Can I clean my injectors instead of replacing them?
    Yes, you can try cleaning your injectors using a fuel system cleaner or an ultrasonic cleaning machine. However, this may not be effective if your injectors are severely clogged or damaged, and may require professional cleaning or replacement.
  4. How do I prevent injector problems?
    To prevent injector problems, you should use high-quality fuel, avoid running your car on low fuel levels, change your fuel filter regularly, and follow your manufacturer’s recommended maintenance schedule. You should also avoid using aftermarket parts or modifications that can affect the fuel system or the ECM.
  5. Can a bad injector cause other codes?
    Yes, a bad injector can cause other codes related to fuel delivery or ignition, such as misfire codes, lean or rich condition codes, or injector control circuit codes. It can also cause damage to the catalytic converter or the engine itself, if not repaired in time.