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P1320 Volkswagen Code - Knock Sensor 2 Circuit Short To Ground

Quick Answer

The P1320 diagnostic trouble code (DTC) for Volkswagen vehicles indicates a problem with the knock sensor 2 circuit short to ground. Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or damage to sensor connectors. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1320 Volkswagen indicates Knock Sensor 2 Circuit Short To Ground.
Common causes
Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or damage to sensor connectors.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 02, 2025
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Code P1320 Volkswagen Description

The P1320 diagnostic trouble code (DTC) for Volkswagen vehicles indicates a problem with the knock sensor 2 circuit short to ground. The knock sensor is a crucial component in the engine management system that detects abnormal combustion in the engine. Knock sensors are designed to detect engine knocking or pinging, which can lead to engine damage if not addressed promptly. When the knock sensor 2 circuit is shorted to ground, it means that there is an abnormal connection between the sensor and the ground, which can interfere with the sensor's ability to accurately detect engine knock.
OBDII Code P1320 Volkswagen - Knock Sensor 2 Circuit Short To Ground
P1320 Volkswagen Code - Knock Sensor 2 Circuit Short To Ground

Common Causes of P1320 Volkswagen

  1. Faulty knock sensor
  2. Wiring issues or shorts in the knock sensor circuit
  3. Corrosion or damage to sensor connectors
  4. Engine overheating causing damage to the sensor
  5. Engine oil contamination affecting sensor function

Symptoms of P1320 Volkswagen

  1. Engine knocking or pinging noises
  2. Reduced engine performance
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Engine misfires

How to Fix P1320 Volkswagen

  1. Diagnose the issue by using a scan tool to confirm the P1320 code and inspecting the knock sensor and related wiring for any visible damage.
  2. Replace the knock sensor if it is found to be faulty or damaged. Ensure that the new sensor is compatible with the vehicle's make and model.
  3. Check and repair any wiring or connector issues in the knock sensor circuit. Repair any shorts or breaks in the wiring.
  4. Clear the DTC and reset the ECM to allow it to relearn the new sensor.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P1320 Volkswagen

The typical cost to repair a knock sensor 2 circuit short to ground issue on a Volkswagen vehicle can range from $200 to $500, including parts and labor. However, prices may vary depending on the specific model of the vehicle, the location of the repair shop, and the labor rates. It is advisable to consult with a certified mechanic or dealership for a more accurate estimate based on your vehicle's specific requirements.

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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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