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P0328 GMC Code - Knock Sensor Circuit High Voltage Bank 1

Quick Answer

The P0328 GMC code indicates that there is a high voltage condition detected in the knock sensor circuit of Bank 1. Common causes include Faulty knock sensor, Wiring issues in the knock sensor circuit, Engine overheating. 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
P0328 GMC indicates Knock Sensor Circuit High Voltage Bank 1.
Common causes
Common causes include Faulty knock sensor, Wiring issues in the knock sensor circuit, Engine overheating.
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 Aug 25, 2024
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Code P0328 GMC Description

The P0328 GMC code indicates that there is a high voltage condition detected in the knock sensor circuit of Bank 1. The knock sensor plays a crucial role in detecting abnormal combustion in the engine, commonly referred to as knocking or pinging. This abnormal combustion can lead to engine damage if not addressed promptly. When the knock sensor detects high voltage, it may retard the ignition timing to prevent knocking, which can result in reduced engine performance, decreased fuel efficiency, and potential engine damage over time.

OBDII Code P0328 GMC - Knock Sensor Circuit High Voltage Bank 1
P0328 GMC Code - Knock Sensor Circuit High Voltage Bank 1

Common Causes of P0328 GMC

  1. Faulty knock sensor
  2. Wiring issues in the knock sensor circuit
  3. Engine overheating
  4. Carbon buildup in the combustion chamber
  5. Faulty ECM (Engine Control Module)

Symptoms of P0328 GMC

  1. Engine knocking or pinging noises
  2. Decreased engine performance or acceleration
  3. Poor fuel efficiency
  4. Illumination of the Check Engine Light
  5. Engine misfires

How to Fix P0328 GMC

  1. Diagnose the knock sensor circuit using a multimeter to check for high voltage readings.
  2. Inspect the wiring harness and connectors for any damage or corrosion.
  3. Test the knock sensor for proper functionality and replace if necessary.
  4. Clear the diagnostic trouble codes and test drive the vehicle to verify the repair.
  5. If the issue persists, further diagnosis may be needed to identify any underlying engine problems.

Cost to Fix P0328 GMC

The typical repair costs for addressing a P0328 GMC code may range from $150 to $400, including parts and labor. However, the specific cost can vary based on the location, vehicle make and model, and the extent of the issue. It's recommended to consult with a trusted auto repair shop for a more accurate estimate based on your specific circumstances.

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Information for Specific GMC Models

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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