P0261 Fault Code

P0261 OBD-II Trouble Code Short Description

Cylinder #1 Injector Circuit Low

What does trouble code P0261 mean?

The P0261 fault code indicates that there is a problem with the fuel injector circuit in cylinder #1. Specifically, it means that the voltage in the circuit is lower than expected, indicating that the injector is not delivering the right amount of fuel to the engine.

There are several potential causes for this issue, including a faulty fuel injector, a problem with the wiring or connectors in the circuit, or a malfunctioning engine control module (ECM).

To diagnose and fix this problem, a mechanic will need to perform a series of tests to determine the underlying cause. This may involve inspecting the fuel injection system, checking the wiring and connectors for damage or corrosion, and using diagnostic tools to test the ECM.

Once the cause of the issue is identified, the mechanic may need to replace the faulty component or repair the damaged wiring or connections. In some cases, a software update may also be required to correct the issue.

Overall, it's important to address a P0261 fault code promptly to prevent further damage to the engine and ensure that the vehicle runs smoothly.


What are the symptoms of the P0261 code?

The P0261 fault code indicates that there is a problem with the cylinder #1 injector circuit that is causing it to operate at a lower than expected level. Some common symptoms associated with this fault code include:

  • Engine misfires or runs roughly, particularly while idling or accelerating
  • Reduced engine power
  • Decreased fuel efficiency
  • Rough or uneven idling
  • Illumination of the Check Engine Light


What causes the P0261 code?

P0261 is a fault code that indicates a problem with the cylinder #1 injector circuit. The possible causes of this fault code are:

  1. Failed injector
  2. Wiring problems in the injector circuit
  3. Failed or malfunctioning PCM (powertrain control module)
  4. Clogged fuel injector
  5. Failed fuel injector driver circuit in the PCM.

To fix this issue, the cause needs to be identified first and accordingly repaired or replaced. This job is best left to a professional mechanic to perform a thorough diagnostics test of the vehicle's engine.

Possible Solutions

How to fix P0261?

To fix the P0261 fault code, you can try the following steps:

  1. Check the wiring and connectors: Start by inspecting the wiring and connectors of the #1 injector circuit. Look for any damages, corrosion, or loose connections. If you find any issues, repair or replace them.

  2. Check the injector: Inspect the #1 injector for any signs of damage, clogging, or malfunction. Using a multimeter, check the injector's resistance and make sure it is within the manufacturer's specifications.

  3. Check the fuel pressure: Verify that the fuel pressure is within the manufacturer's recommended range by using a fuel pressure gauge.

  4. Check the powertrain control module (PCM): If everything else checks out, there might be an issue with the PCM. Have it inspected by a professional mechanic or replace it if necessary.

Overall, the P0261 fault code indicates a problem with the #1 injector circuit. By following these steps, you can determine and fix the underlying cause of the issue.