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Engine-Codes – Generic – P1201

P1201 Code - Fuel System Failure Caused No. 1 Cylinder Misfire

Quick Answer

The diagnostic trouble code P1201 indicates a fuel system failure that has led to a misfire in the No. Common causes include Clogged fuel injector in the No, 1 cylinder, Faulty fuel pressure regulator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1201 indicates Fuel System Failure Caused No. 1 Cylinder Misfire.
Common causes
Common causes include Clogged fuel injector in the No, 1 cylinder, Faulty fuel pressure regulator.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P1201 Description

The diagnostic trouble code P1201 indicates a fuel system failure that has led to a misfire in the No. 1 cylinder of the engine. This code is typically found in vehicles with a multi-cylinder engine, where each cylinder is responsible for generating power through combustion. The fuel system failure can disrupt the proper fuel delivery to the No. 1 cylinder, causing it to misfire. This can result in poor engine performance, reduced fuel efficiency, and potential damage to other components of the vehicle.

OBDII Code P1201 - Fuel System Failure Caused No. 1 Cylinder Misfire
P1201 Code - Fuel System Failure Caused No. 1 Cylinder Misfire

Common Causes of P1201

  1. Clogged fuel injector in the No. 1 cylinder
  2. Faulty fuel pressure regulator
  3. Fuel pump malfunction
  4. Dirty or contaminated fuel filter
  5. Ignition system issues affecting the No. 1 cylinder

Symptoms of P1201

  1. Rough idling or engine vibrations
  2. Loss of power or acceleration
  3. Increased fuel consumption
  4. Engine misfires or hesitation
  5. Check Engine light illuminated on the dashboard

How to Fix P1201

  1. Diagnose the specific cause of the fuel system failure and cylinder misfire using a scan tool.
  2. Inspect and potentially replace the clogged fuel injector in the No. 1 cylinder.
  3. Test and replace the fuel pressure regulator if it is faulty.
  4. Check and potentially replace the fuel pump if it is not delivering fuel properly.
  5. Replace the fuel filter if it is dirty or contaminated, affecting fuel flow to the No. 1 cylinder.

Cost to Fix P1201

The typical repair costs for addressing a fuel system failure causing a No. 1 cylinder misfire can range from $200 to $800, depending on the specific cause and the parts needed for replacement. Labor costs can vary, but on average, you can expect to pay between $80 and $150 per hour for the repair. It's advisable to consult with a certified mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model.

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Code P1201 Information for Specific Makes

  • P1201 Acura — Fuel System Failure Caused No. 1 Cylinder Misfire
  • P1201 Audi — Fuel Injector Circuit Cylinder 1 Electrical Malfunction
  • P1201 Buick — Transmission Range Redundant Command Message Counter Incorrect
  • P1201 Cadillac — Transmission Range Redundant Command Message Counter Incorrect
  • P1201 Chevrolet — Transmission Range Redundant Command Message Counter Incorrect
  • P1201 GMC — Transmission Range Redundant Command Message Counter Incorrect
  • P1201 Honda — Fuel System Failure Caused No. 1 Cylinder Misfire
  • P1201 Isuzu — Injector Circuit Open / Shorted Cylinder #1
  • P1201 Jaguar — Fuel Injector Circuit Cylinder 1 Electrical Malfunction
  • P1201 Volkswagen — Fuel Injector Circuit Cylinder 1 Electrical Malfunction
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1201 Code

1. What are common symptoms of OBDII code P1201 related to fuel system failure causing a No. 1 cylinder misfire?

The common symptoms include rough idling, engine misfires, loss of power, and potentially poor fuel efficiency.

2. What are the possible causes of OBDII code P1201 indicating a No. 1 cylinder misfire due to fuel system failure?

Potential causes may include a faulty fuel injector, clogged fuel filter, fuel pump issues, vacuum leaks, or problems with the fuel pressure regulator.

3. How can I diagnose the root cause of OBDII code P1201 associated with fuel system failure leading to a No. 1 cylinder misfire?

Diagnosing this issue typically involves conducting a thorough inspection of the fuel system components, checking fuel pressure, examining the fuel injector operation, and scanning for any vacuum leaks.

4. Can a DIY enthusiast repair OBDII code P1201 caused by fuel system failure and No. 1 cylinder misfire?

While some basic checks like inspecting for loose connections or replacing a fuel filter can be done by DIYers, diagnosing and repairing complex issues like a faulty fuel injector may require professional help.

5. Is it safe to continue driving with OBDII code P1201 related to fuel system failure and a No. 1 cylinder misfire?

Continuing to drive with this issue can potentially cause further damage to the engine and catalytic converter, so it is recommended to address the problem promptly.

6. Are there any specific maintenance tips to prevent OBDII code P1201 from occurring due to fuel system issues?

Regularly servicing the fuel system, using high-quality fuel, and promptly addressing any signs of engine trouble can help prevent the occurrence of this error code.

7. Can a malfunctioning oxygen sensor trigger OBDII code P1201 indicating a No. 1 cylinder misfire caused by fuel system problems?

Yes, a faulty oxygen sensor can disrupt the air-fuel mixture, potentially leading to misfires in the No. 1 cylinder and triggering the P1201 code related to fuel system issues.

8. How important is it to address OBDII code P1201 promptly when it relates to fuel system failure and No. 1 cylinder misfire?

Promptly addressing this code is crucial to prevent further damage to the engine, ensure optimal performance, and maintain fuel efficiency.

9. Will resetting the OBDII system clear the P1201 code associated with fuel system issues and a No. 1 cylinder misfire?

Resetting the system may temporarily clear the code, but if the underlying issue causing the misfire is not resolved, the code is likely to reappear after driving the vehicle.

10. Can a dirty or clogged fuel injector lead to the occurrence of OBDII code P1201 indicating fuel system failure causing a No. 1 cylinder misfire?

Yes, a dirty or clogged fuel injector can disrupt the proper fuel delivery to the No. 1 cylinder, resulting in misfires and triggering the P1201 error code related to fuel system issues.

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