P2347 Fault Code

Cylinder 12 Above Knock Threshold

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2347 fault code indicates that the engine control module (ECM) has detected that the knock sensor for cylinder 12 has registered values that exceed the predetermined knock threshold. This could suggest that the engine is experiencing abnormal combustion or excessive vibration that the ECM interprets as knocking.

What are the symptoms of the P2347 code?

When this fault code is present, symptoms may include:

• Illuminated check engine light on the dashboard.
• Engine performance issues such as rough idling, stalling, or reduced acceleration.
• Unusual noises from the engine resembling knocking or pinging.

What causes the P2347 code?

This issue may stem from several factors including:

• A faulty knock sensor that is providing inaccurate readings.
• The presence of detonation or pre-ignition caused by incorrect fuel quality, incorrect ignition timing, or an overly lean fuel mixture.
• Mechanical issues such as worn engine components or improper engine tuning.

How to fix P2347?

To resolve the P2347 code, it is recommended to:

• Inspect and, if necessary, replace the knock sensor for cylinder 12.
• Check the fuel for quality and consistency, and ensure that the correct octane level is being used.
• Verify ignition timing and make adjustments if inconsistencies are found.
• Inspect the engine for any mechanical issues that could affect performance and correct them as needed.
• Clear the fault code and perform a test drive to ensure the issue is resolved.