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Engine-Codes – Generic – P02C6

P02C6 Code - Cylinder 12 - Fuel Trim at Max Limit

Quick Answer

The diagnostic trouble code P02C6 indicates that there is an issue with Cylinder 12's fuel trim being at the maximum limit. Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel injector. 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
P02C6 indicates Cylinder 12 - Fuel Trim at Max Limit.
Common causes
Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel injector.
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 Sep 17, 2024
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Code P02C6 Description

The diagnostic trouble code P02C6 indicates that there is an issue with Cylinder 12's fuel trim being at the maximum limit. The fuel trim is a term used to describe the adjustment of fuel delivery by the engine control module (ECM) to maintain the proper air-fuel ratio. When the fuel trim is at the maximum limit, it means that the ECM is unable to make any further adjustments to compensate for a lean or rich condition in Cylinder 12.

OBDII Code P02C6 - Cylinder 12 - Fuel Trim at Max Limit
P02C6 Code - Cylinder 12 - Fuel Trim at Max Limit

Common Causes of P02C6

  1. Vacuum leak
  2. Faulty oxygen sensor
  3. Clogged fuel injector
  4. Malfunctioning mass airflow sensor
  5. Issue with the fuel pressure regulator

Symptoms of P02C6

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation or stumbling during acceleration
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P02C6

  1. Perform a thorough inspection of the vacuum lines and intake system to check for any leaks. Repair or replace any damaged components.
  2. Test the oxygen sensor to ensure it is functioning correctly. Replace if necessary.
  3. Clean or replace the fuel injector in Cylinder 12 to address any clogs.
  4. Inspect and test the mass airflow sensor for proper operation. Replace if needed.
  5. Check the fuel pressure regulator for any issues and replace if faulty.

Cost to Fix P02C6

The cost of repairing a Cylinder 12 fuel trim at the maximum limit issue can vary depending on the exact cause of the problem and the cost of parts and labor in your area. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to get quotes from local auto repair shops for a more accurate estimate.

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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.

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