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Engine-Codes – GMC – P0333 2015 GMC Sierra

P0333 2015 GMC Sierra Code - Knock Sensor Circuit High Voltage Bank 2

Quick Answer

The P0333 diagnostic trouble code (DTC) indicates a problem with the Knock Sensor Circuit High Voltage Bank 2 in a 2015 GMC Sierra. Common causes include Faulty knock sensor on bank 2, Wiring issues or poor electrical connections in the knock sensor circuit, Engine detonation or pre-ignition due to incorrect fuel octane. 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
P0333 2015 GMC Sierra indicates Knock Sensor Circuit High Voltage Bank 2.
Common causes
Common causes include Faulty knock sensor on bank 2, Wiring issues or poor electrical connections in the knock sensor circuit, Engine detonation or pre-ignition due to incorrect fuel octane.
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 12, 2024
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Code P0333 2015 GMC Sierra Description

The P0333 diagnostic trouble code (DTC) indicates a problem with the Knock Sensor Circuit High Voltage Bank 2 in a 2015 GMC Sierra. The knock sensor is a crucial component in the engine management system that detects abnormal combustion noise, often referred to as "knocking" or "pinging." This code specifically points to an issue with the knock sensor circuit on bank 2, which is typically the side of the engine where cylinder 2 is located.

OBDII Code P0333 2015 GMC Sierra - Knock Sensor Circuit High Voltage Bank 2
P0333 2015 GMC Sierra Code - Knock Sensor Circuit High Voltage Bank 2

Common Causes of P0333 2015 GMC Sierra

  1. Faulty knock sensor on bank 2.
  2. Wiring issues or poor electrical connections in the knock sensor circuit.
  3. Engine detonation or pre-ignition due to incorrect fuel octane.
  4. Engine overheating leading to abnormal combustion.
  5. ECM software malfunction or calibration error.

Symptoms of P0333 2015 GMC Sierra

  1. Engine knocking or pinging noise during acceleration.
  2. Decreased engine performance or power output.
  3. Illumination of the Check Engine Light (CEL) on the dashboard.
  4. Poor fuel economy or increased fuel consumption.
  5. Rough idle or hesitation during acceleration.

How to Fix P0333 2015 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the presence of the P0333 code and pinpoint the specific cause.
  2. Inspect the knock sensor on bank 2 for any physical damage or signs of wear. Replace the sensor if necessary.
  3. Check the wiring harness and connectors for any corrosion, damage, or loose connections. Repair or replace as needed.
  4. Clear the DTC from the ECM memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying engine issues causing abnormal combustion.

Cost to Fix P0333 2015 GMC Sierra

The typical repair costs for addressing a P0333 code in a 2015 GMC Sierra can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates to obtain a more accurate estimate for this repair. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive pricing.

What does this mean?

Tech Notes for P0333 2015 GMC Sierra

The P0333 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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