AutoCodes – Ford – P2339 Ford

P2339 Ford Code - Cylinder 4 Above Knock Threshold

Quick Answer

The Knock Sensor (KS) senses engine knocking (also known as detonation or pinging) using a piezoelectric element. Common causes include Faulty knock sensor, Knock sensor circuit poor electrical connection, Knock sensor harness is open or shorted. 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 Ford indicates Cylinder 4 Above Knock Threshold.
Common causes: Common causes include Faulty knock sensor, Knock sensor circuit poor electrical connection, Knock sensor harness is open or shorted.
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.

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Code Popularity 3,575

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2339 Ford Description

The Knock Sensor (KS) senses engine knocking (also known as detonation or pinging) using a piezoelectric element. The sensor is attached to the cylinder block, cylinder head or intake manifold. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the Engine Control Module (ECM). The ECM uses this signal to retard the ignition timing and protect the engine from this damaging pre-ignition.

OBDII Code P2339 Ford - Cylinder 4 Above Knock Threshold - AutoCodes.com — P2339 Ford Code - Cylinder 4 Above Knock Threshold

What does this mean?

What are the Possible Causes of the DTC P2339 Ford?

Faulty knock sensor
Knock sensor circuit poor electrical connection
Knock sensor harness is open or shorted
Faulty Engine Control Module (ECM)

How to Fix the DTC P2339 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2339 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2339 Ford code?

Need more information on how to fix the P2339 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2339 Ford code diagnosed by a professional: Find a repair shop in your area

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 P2339 Ford Code

1. What are the common symptoms of OBDII code P2339 in a Ford related to Cylinder 4 Above Knock Threshold?

- Common symptoms may include engine knocking noises, reduced engine performance, and illuminated Check Engine Light.

2. What can cause the OBDII code P2339 in a Ford, indicating Cylinder 4 Above Knock Threshold?

- Potential causes may include a faulty knock sensor, issues with the cylinder 4 ignition system, or engine mechanical problems.

3. How serious is the OBDII code P2339 in a Ford and what are the risks of driving with this issue?

- Ignoring this code may lead to engine damage or poor fuel efficiency. It is recommended to address the issue promptly to prevent further problems.

4. What are some DIY repair tips for fixing the OBDII code P2339 in a Ford related to Cylinder 4 Above Knock Threshold?

- DIY repair tips may include checking and replacing the knock sensor, inspecting the ignition system components, and ensuring proper engine maintenance.

5. Is it possible to reset the OBDII code P2339 in a Ford without fixing the underlying issue?

- While clearing the code temporarily may turn off the Check Engine Light, it is crucial to diagnose and repair the root cause to prevent ongoing issues.

6. How can a professional mechanic diagnose the OBDII code P2339 in a Ford accurately?

- A mechanic may use specialized diagnostic tools to monitor sensor readings, conduct tests on the ignition system, and inspect the engine components thoroughly.

7. Can a faulty spark plug or ignition coil trigger the OBDII code P2339 in a Ford?

- Yes, a malfunctioning spark plug or ignition coil in cylinder 4 can cause abnormal combustion, leading to the code P2339 being triggered.

8. Will driving with the OBDII code P2339 in a Ford cause permanent damage to the engine?

- Continued driving with this issue can potentially cause long-term damage to the engine, especially if the root cause is not addressed promptly.

9. How long does it typically take to repair the OBDII code P2339 in a Ford at a repair shop?

- The repair time can vary depending on the exact cause, but it may take a few hours to a day for a professional mechanic to diagnose and fix the issue.

10. Are there any recalls or technical service bulletins related to the OBDII code P2339 in Ford vehicles?

- It is advisable to check with Ford or authorized service centers for any relevant recalls or technical service bulletins related to this specific OBDII code.