OBD-II Generic Error Code P0271: Injector Circuit High Cyl 4 - How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0271
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0271 indicates a high voltage issue in the fuel injector circuit for cylinder 4. This can cause misfires, rough idling, and reduced fuel economy. Common causes include a faulty injector, wiring problems, or an engine control module (ECM) issue.
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Tools You'll Need

How to Fix Error Code P0271

  1. Safety First: Disconnect the Battery

    Always disconnect the battery before working on fuel system components.

  2. Locate the Cylinder 4 Injector

  3. Visually Inspect the Injector and Wiring

  4. Test Injector Resistance Using a Multimeter

  5. Check the Control Circuit Voltage

    Be careful not to short the probes; avoid touching both terminals at once.

  6. Perform a Noid Light Test

  7. Swap Injectors to Confirm Fault

    Use caution when handling fuel; relieve fuel pressure if necessary.

  8. Replace or Repair as Needed

Parts You May Need

Fuel injector (cylinder 4)
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Injector wiring harness connector
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Fuel injector (cylinder 4)
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Injector wiring harness connector
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Fuel injector (cylinder 4)
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Injector wiring harness connector
Check Price on Amazon
Fuel injector (cylinder 4)
Check Price on Amazon
Injector wiring harness connector
Check Price on Amazon
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When to Call a Professional

If you are uncomfortable working with fuel injectors or if testing points to an ECM failure (requires reprogramming), take your vehicle to a professional mechanic.

Frequently Asked Questions

What does error code P0271 mean?
P0271 indicates a high voltage condition in the fuel injector circuit for cylinder 4, meaning the injector or its control circuit is malfunctioning.
Can I drive with a P0271 code?
It's not recommended. Driving with this code can cause misfires, poor fuel economy, and potential damage to the catalytic converter.
How much does it cost to fix P0271?
Cost varies. A new injector ranges from $50-$200, plus labor ($100-$200). Wiring repairs are cheaper, while ECM replacement can be $500-$1000.
Is P0271 the same as P0269?
No. P0269 is for cylinder 3 injector circuit high. P0271 is specific to cylinder 4. Different cylinders have different codes.
What tools do I need to diagnose P0271?
An OBD2 scanner, a multimeter, and basic hand tools. A noid light can help but is optional.

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