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OBD Code P2347

Cylinder 12 Above Knock/Combustion Vibration Sensor Threshold

CodeP2347
DescriptionCylinder 12 Above Knock/Combustion Vibration Sensor Threshold
SystemIgnition

What Does P2347 Mean?

Cylinder 12 Above Knock/Combustion Vibration Sensor Threshold. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the ignition.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P2347

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Inspect spark plugs for wear, carbon fouling, oil deposits, or incorrect gap. Replace as needed.
  2. Test ignition coil(s) with a multimeter for proper primary and secondary resistance.
  3. Check ignition coil connector and wiring for damage, corrosion, or poor connections.
  4. Inspect the distributor cap and rotor (if equipped) for cracks or carbon tracking.
  5. Verify the crankshaft position sensor is providing a proper signal to the ignition module.
  6. Clear codes and test drive under various load conditions.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P2347 serious?

The severity depends on the underlying cause. Some triggers for P2347 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P2347 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P2347?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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