P0261 - OBD-II Trouble Code

Auto Systems and Repair

Cylinder #1 Injector Circuit Low

Our emissions expert has put together the following information about the P0261 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

  • OBD II P0261

Fault Code Definition
Code P0261 is triggered when the voltage in the #1 Cylinder Injector Circuit is too low. The Powertrain Control Module (PCM) uses special transistors—called "drivers"—to turn the Fuel Injectors on and off in the Fuel Injection System.

Symptoms

  • Check Engine Light will illuminate
  • In some cases, the engine will misfire and have a rough idle
  • In some cases, the vehicle will get poor fuel economy

Common Problems That Trigger the P0261 Code

  • Defective Fuel Injector
  • Faulty or corroded Fuel Injector, wiring, and/or connections
  • Plugged Fuel Injector
  • Dirt in the Fuel Injector

Common Misdiagnoses

  • Fuel Injector or PCM is replaced when the problem is in the wiring and connections
  • Fuel Injector is replaced when the real problem is a poor ground
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