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P0647 2017 GMC Sierra Code - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage

Quick Answer

The P0647 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Air Conditioning Compressor Clutch Relay Control Circuit High Voltage. Common causes include Faulty air conditioning compressor clutch relay, Wiring issues in the air conditioning compressor clutch relay circuit, Corrosion or poor connections in the circuit. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0647 2017 GMC Sierra indicates Air Conditioning Compressor Clutch Relay Control Circuit High Voltage.
Common causes
Common causes include Faulty air conditioning compressor clutch relay, Wiring issues in the air conditioning compressor clutch relay circuit, Corrosion or poor connections in the circuit.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P0647 2017 GMC Sierra Description

The P0647 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Air Conditioning Compressor Clutch Relay Control Circuit High Voltage. This means that the powertrain control module (PCM) has detected a higher than normal voltage signal in the circuit responsible for controlling the air conditioning compressor clutch relay. The air conditioning compressor clutch relay is a crucial component that engages and disengages the air conditioning compressor, allowing the system to function properly. When the voltage in the circuit is too high, it can lead to issues with the operation of the air conditioning system, potentially causing the compressor to not engage or disengage as needed.

OBDII Code P0647 2017 GMC Sierra - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
P0647 2017 GMC Sierra Code - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage

Common Causes of P0647 2017 GMC Sierra

  1. Faulty air conditioning compressor clutch relay.
  2. Wiring issues in the air conditioning compressor clutch relay circuit.
  3. Corrosion or poor connections in the circuit.
  4. Issues with the PCM or other related control modules.

Symptoms of P0647 2017 GMC Sierra

  1. Lack of cool air coming from the air conditioning system.
  2. Air conditioning system not engaging or disengaging properly.
  3. Unusual noises coming from the air conditioning compressor.
  4. Check Engine Light illuminated on the dashboard.

How to Fix P0647 2017 GMC Sierra

  1. Begin by inspecting the wiring and connections in the air conditioning compressor clutch relay circuit for any damage or corrosion. Repair or replace any damaged wiring or connectors.
  2. Test the air conditioning compressor clutch relay to ensure it is functioning properly. Replace the relay if necessary.
  3. Check the PCM and other related control modules for any faults or issues. Perform any necessary repairs or reprogramming.
  4. Clear the DTC from the PCM memory using a diagnostic scan tool.
  5. Test the air conditioning system to ensure proper operation and verify that the code does not return.

Cost to Fix P0647 2017 GMC Sierra

The typical repair costs for addressing a P0647 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new air conditioning compressor clutch relay can range from $50 to $150. Labor costs at auto repair shops typically range from $80 to $150 per hour. The total cost of the repair can therefore range from $150 to $500 or more, depending on the extent of the issue and the specific repairs needed. It is advisable to check with local auto repair shops for a more accurate estimate based on your location and vehicle.

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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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