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Engine-Codes – Generic – P2347

P2347 Code - Cylinder 12 Above Knock Threshold

Quick Answer

The diagnostic trouble code P2347 indicates that Cylinder 12 in the engine is operating above the knock threshold. Common causes include Incorrect ignition timing, Faulty knock sensor, Carbon buildup in the combustion chamber. 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
P2347 indicates Cylinder 12 Above Knock Threshold.
Common causes
Common causes include Incorrect ignition timing, Faulty knock sensor, Carbon buildup in the combustion chamber.
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 P2347 Description

The diagnostic trouble code P2347 indicates that Cylinder 12 in the engine is operating above the knock threshold. Knock, also known as detonation, is the premature ignition of the air-fuel mixture in the combustion chamber. When a cylinder operates above the knock threshold, it can lead to engine damage, reduced performance, and decreased fuel efficiency. This issue can be caused by a variety of factors, including incorrect ignition timing, a faulty knock sensor, carbon buildup in the combustion chamber, or a malfunctioning fuel injector.

OBDII Code P2347 - Cylinder 12 Above Knock Threshold
P2347 Code - Cylinder 12 Above Knock Threshold

Common Causes of P2347

  1. Incorrect ignition timing
  2. Faulty knock sensor
  3. Carbon buildup in the combustion chamber
  4. Malfunctioning fuel injector

Symptoms of P2347

  1. Knocking or pinging noises from the engine
  2. Reduced power and acceleration
  3. Rough idling or misfiring
  4. Decreased fuel efficiency

How to Fix P2347

  1. Diagnose the root cause of the issue using a scan tool to check for any other related trouble codes.
  2. Inspect the ignition timing and adjust if necessary.
  3. Test the knock sensor for proper operation and replace if faulty.
  4. Clean the combustion chamber to remove any carbon buildup.
  5. Check the fuel injectors for proper function and replace any that are malfunctioning.

Cost to Fix P2347

The typical repair costs for addressing a Cylinder 12 above knock threshold issue can range from $200 to $800, depending on the specific cause of the problem and the parts and labor required for the repair. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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Code P2347 Information for Specific Makes

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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