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P0327 2015 GMC Sierra Code - Knock Sensor Circuit Low Voltage Bank 1

Quick Answer

The P0327 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a low voltage condition in the knock sensor circuit for bank 1. Common causes include Faulty knock sensor, Damaged or corroded wiring in the knock sensor circuit, Loose or poor connections in the knock sensor circuit. 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
P0327 2015 GMC Sierra indicates Knock Sensor Circuit Low Voltage Bank 1.
Common causes
Common causes include Faulty knock sensor, Damaged or corroded wiring in the knock sensor circuit, Loose or poor connections in the knock sensor circuit.
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 P0327 2015 GMC Sierra Description

The P0327 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a low voltage condition in the knock sensor circuit for bank 1. The knock sensor is a crucial component in the vehicle's engine management system as it detects abnormal combustion in the cylinders. When the knock sensor detects knocking or pinging in the engine, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage.

OBDII Code P0327 2015 GMC Sierra - Knock Sensor Circuit Low Voltage Bank 1
P0327 2015 GMC Sierra Code - Knock Sensor Circuit Low Voltage Bank 1

Common Causes of P0327 2015 GMC Sierra

  1. Faulty knock sensor
  2. Damaged or corroded wiring in the knock sensor circuit
  3. Loose or poor connections in the knock sensor circuit
  4. Engine overheating leading to knock sensor damage
  5. Issues with the ECM or engine control module

Symptoms of P0327 2015 GMC Sierra

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

How to Fix P0327 2015 GMC Sierra

  1. Diagnose the issue by using a scan tool to read the DTC and checking the knock sensor and wiring for any visible damage or corrosion.
  2. Replace the knock sensor if it is found to be faulty. This may involve removing other components to access the sensor.
  3. Inspect and repair any damaged or corroded wiring in the knock sensor circuit.
  4. Clear the DTC with a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to check for underlying issues with the ECM or engine components.

Cost to Fix P0327 2015 GMC Sierra

The cost of repairing a P0327 DTC for a knock sensor circuit low voltage in a 2015 GMC Sierra can vary depending on the extent of the issue and the specific parts needed for the repair. On average, the cost of replacing a knock sensor and repairing associated wiring can range from $200 to $500, including parts and labor. Additional costs may apply if further diagnostics or repairs are needed. It's advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs and location. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and shop rates.

What does this mean?

Tech Notes for P0327 2015 GMC Sierra

The P0327 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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