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Engine-Codes – Generic – P0681

P0681 Code - Cylinder 11 Glow Plug Circuit Fault

Quick Answer

The diagnostic trouble code P0681 indicates a fault in the cylinder 11 glow plug circuit. Common causes include Failed glow plug in cylinder 11, Wiring harness damage or corrosion, Faulty glow plug relay. 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
P0681 indicates Cylinder 11 Glow Plug Circuit Fault.
Common causes
Common causes include Failed glow plug in cylinder 11, Wiring harness damage or corrosion, Faulty glow plug relay.
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 07, 2024
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Code P0681 Description

The diagnostic trouble code P0681 indicates a fault in the cylinder 11 glow plug circuit. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber before ignition. When this code appears, it means that there is an issue in the circuit responsible for delivering power to the glow plug in cylinder 11. This can lead to difficulties starting the engine, decreased fuel efficiency, rough idling, and potentially even engine misfires.

OBDII Code P0681 - Cylinder 11 Glow Plug Circuit Fault
P0681 Code - Cylinder 11 Glow Plug Circuit Fault

Common Causes of P0681

  1. Failed glow plug in cylinder 11.
  2. Wiring harness damage or corrosion.
  3. Faulty glow plug relay.
  4. ECM malfunction.
  5. Poor electrical connection in the circuit.

Symptoms of P0681

  1. Difficulty starting the engine, especially in cold weather.
  2. Reduced fuel efficiency.
  3. Rough idling or engine vibrations.
  4. Engine misfires.
  5. Illumination of the check engine light.

How to Fix P0681

  1. Use a diagnostic tool to confirm the P0681 code and pinpoint the exact cause.
  2. Inspect the glow plug in cylinder 11 for damage or wear and replace if necessary.
  3. Check the wiring harness for any signs of damage, corrosion, or loose connections and repair as needed.
  4. Test the glow plug relay and replace if it is not functioning correctly.
  5. If the issue persists, inspect the ECM for faults and address any malfunctions.

Cost to Fix P0681

The typical repair costs for addressing a cylinder 11 glow plug circuit fault can range from $150 to $400, including parts and labor. However, it is essential to note that the final cost can vary based on factors such as the vehicle make and model, the location of the repair shop, and the specific diagnosis time and labor rates. It is advisable to consult with a trusted mechanic or repair shop to get an accurate estimate for this particular issue.

When is the Code Detected?

The Engine Control Module (ECM) has detected a fault in the cylinder #11 glow plug circuit

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Code P0681 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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