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P0261

High Severity

Cylinder 1 Injector Circuit Low

Fuel System

What Does P0261 Mean?

Low voltage in cylinder 1 injector driver circuit.

Common Fix

Replace cylinder 1 injector

Estimated Cost (DIY)

$40 - $150

Symptoms

  • ⚠️Cylinder 1 misfire
  • ⚠️Rough idle
  • ⚠️Loss of power

Common Causes

Short in injector wiringlikely
Failed injector coilpossible
ECM driver issueunlikely

How to Diagnose P0261

  1. 1Check injector connector
  2. 2Measure injector resistance
  3. 3Check wiring for shorts to ground
  4. 4Replace injector if coil shorted

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Frequently Asked Questions

What is injector circuit low?
It means the ECM sees low voltage/resistance in the injector circuit, often from a shorted injector coil.
Can I test injector resistance?
Yes β€” unplug the injector and measure with a multimeter. Compare to specs (typically 11-18 ohms).

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