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Engine-Codes – GMC – P0331 2018 GMC Sierra

P0331 2018 GMC Sierra Code - Knock Sensor Performance Bank 2

Quick Answer

The P0331 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Knock Sensor Performance on Bank 2. Common causes include Faulty knock sensor on Bank 2, Wiring or connector issues related to the knock sensor, Engine mechanical problems causing abnormal combustion. 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
P0331 2018 GMC Sierra indicates Knock Sensor Performance Bank 2.
Common causes
Common causes include Faulty knock sensor on Bank 2, Wiring or connector issues related to the knock sensor, Engine mechanical problems causing abnormal combustion.
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 17, 2024
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Code P0331 2018 GMC Sierra Description

The P0331 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Knock Sensor Performance on Bank 2. The knock sensor is a crucial component in the engine management system that detects abnormal combustion, often referred to as engine knock or detonation. When the knock sensor detects these abnormal vibrations, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage.

OBDII Code P0331 2018 GMC Sierra - Knock Sensor Performance Bank 2
P0331 2018 GMC Sierra Code - Knock Sensor Performance Bank 2

Common Causes of P0331 2018 GMC Sierra

  1. Faulty knock sensor on Bank 2
  2. Wiring or connector issues related to the knock sensor
  3. Engine mechanical problems causing abnormal combustion
  4. ECM software or hardware issues
  5. Poor quality fuel or incorrect fuel octane rating

Symptoms of P0331 2018 GMC Sierra

  1. Engine knocking or pinging noises
  2. Decreased engine performance or power
  3. Poor fuel economy
  4. Illuminated check engine light
  5. Engine misfires

How to Fix P0331 2018 GMC Sierra

  1. Diagnose the specific cause of the P0331 code by using a scan tool to monitor the knock sensor's performance on Bank 2.
  2. Inspect the wiring and connectors related to the knock sensor for any damage or corrosion, and repair or replace as necessary.
  3. Test the knock sensor itself for proper operation and replace if found to be faulty.
  4. Check for any engine mechanical issues that could be causing abnormal combustion, such as carbon buildup or timing chain problems, and address them accordingly.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0331 2018 GMC Sierra

The typical repair costs for addressing a P0331 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a knock sensor can cost between $150 and $250, including parts and labor. However, if additional repairs or diagnostic work are needed, the total cost could be higher. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P0331 2018 GMC Sierra

The P0331 code means that the Knock Sensor is not working properly. Problems with the knock sensor will not cause engine performance problems. Replacing the knock sensor usually takes care of the problem.

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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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