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Engine-Codes – Generic – P2339

P2339 Code - Cylinder 4 Above Knock Threshold

Quick Answer

The P2339 code indicates that there is a problem with cylinder 4 in the engine exceeding the knock threshold. Common causes include Faulty ignition timing, Worn or damaged spark plug, Malfunctioning 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
P2339 indicates Cylinder 4 Above Knock Threshold.
Common causes
Common causes include Faulty ignition timing, Worn or damaged spark plug, Malfunctioning 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 Aug 18, 2024
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Code P2339 Description

The P2339 code indicates that there is a problem with cylinder 4 in the engine exceeding the knock threshold. Knocking or pinging in an engine can cause damage to the internal components and decrease performance. Knocking occurs when the air-fuel mixture ignites spontaneously in the combustion chamber, rather than being ignited by the spark plug at the correct time. This can lead to vibrations, loss of power, and potential engine damage if not addressed promptly. The code may be triggered by issues such as incorrect ignition timing, a faulty spark plug, a malfunctioning fuel injector, or a problem with the engine control module.

OBDII Code P2339 - Cylinder 4 Above Knock Threshold
P2339 Code - Cylinder 4 Above Knock Threshold

Common Causes of P2339

  1. Faulty ignition timing
  2. Worn or damaged spark plug
  3. Malfunctioning fuel injector
  4. Engine control module (ECM) issue
  5. Incorrect air-fuel mixture

Symptoms of P2339

  1. Engine knocking or pinging noises
  2. Reduced engine performance or power
  3. Rough idling or misfires
  4. Decreased fuel efficiency
  5. Check Engine Light illuminated on the dashboard

How to Fix P2339

  1. Inspect and replace spark plugs in cylinder 4
  2. Check ignition timing and adjust if necessary
  3. Test and potentially replace fuel injector for cylinder 4
  4. Scan and diagnose engine control module for any faults
  5. Clear the error code and test drive the vehicle to ensure the issue has been resolved

Cost to Fix P2339

The cost of repairing a P2339 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, the parts required for this repair, such as spark plugs or fuel injectors, can range from $50 to $200. Labor costs can add an additional $100 to $300, depending on the complexity of the repair and the shop's hourly rates. Therefore, the total cost for addressing a P2339 code could be anywhere from $150 to $500. It is recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate for your particular vehicle.

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Code P2339 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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