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Engine-Codes – GMC – P0647 2014 GMC Sierra

P0647 2014 GMC Sierra Code - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage

Quick Answer

The P0647 diagnostic trouble code (DTC) for a 2014 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 control circuit, Corrosion or poor connections in the relay control 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 2014 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 control circuit, Corrosion or poor connections in the relay control 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 15, 2024
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Code P0647 2014 GMC Sierra Description

The P0647 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Air Conditioning Compressor Clutch Relay Control Circuit High Voltage. This code is specifically related to the control circuit for the air conditioning compressor clutch relay, which is responsible for engaging and disengaging the compressor clutch in the air conditioning system.

OBDII Code P0647 2014 GMC Sierra - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
P0647 2014 GMC Sierra Code - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage

Common Causes of P0647 2014 GMC Sierra

  1. Faulty air conditioning compressor clutch relay
  2. Wiring issues in the control circuit
  3. Corrosion or poor connections in the relay control circuit
  4. PCM (Powertrain Control Module) malfunction
  5. Electrical issues such as a short circuit or open circuit in the system

Symptoms of P0647 2014 GMC Sierra

  1. Inoperative air conditioning system
  2. Reduced cooling capacity
  3. Air conditioning compressor not engaging
  4. Illumination of the check engine light

How to Fix P0647 2014 GMC Sierra

  1. Begin by diagnosing the root cause of the high voltage condition in the air conditioning compressor clutch relay control circuit using a multimeter and wiring diagram.
  2. Inspect the air conditioning compressor clutch relay for any signs of damage or malfunction and replace if necessary.
  3. Check the wiring in the control circuit for any corrosion, damage, or poor connections, repairing or replacing as needed.
  4. Test the PCM to ensure it is functioning correctly and reprogram if necessary.
  5. Clear the DTC and test the air conditioning system to verify that the issue has been resolved.

Cost to Fix P0647 2014 GMC Sierra

The typical repair costs for addressing a P0647 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty air conditioning compressor clutch relay can range from $50 to $150, while addressing wiring issues or PCM problems may increase the total repair cost. Labor rates at auto repair shops can vary, but on average, expect to pay between $80 and $150 per hour for diagnosis and repair. It's recommended to contact local auto repair shops for a more accurate estimate based on your location and vehicle specifics.

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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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