P0647 GMC Code - Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
Quick Answer
When the Air Conditioning (A/C) switch is pressed, the Heating, Ventilation, and Air Conditioning (HVAC) control module sends an A/C request message to the Engine Control Module (ECM) via serial data. Common causes include Faulty Air Conditioning (A/C) Compressor Clutch Relay, Air Conditioning Compressor Clutch Relay harness is open or shorted, Air Conditioning Compressor Clutch Relay circuit poor electrical connection. 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 GMC indicates Air Conditioning Compressor Clutch Relay Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Air Conditioning (A/C) Compressor Clutch Relay, Air Conditioning Compressor Clutch Relay harness is open or shorted, Air Conditioning Compressor Clutch Relay circuit poor electrical connection.
- 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.
Code P0647 GMC Description
What are the Possible Causes of the DTC P0647 GMC?
- Faulty Air Conditioning (A/C) Compressor Clutch Relay
- Air Conditioning Compressor Clutch Relay harness is open or shorted
- Air Conditioning Compressor Clutch Relay circuit poor electrical connection
- Faulty Air Conditioning Compressor Clutch
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0647 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0647 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific GMC Models
- P0647 2014 GMC Sierra — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2015 GMC Sierra — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2016 GMC Sierra — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2017 GMC Sierra — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2018 GMC Sierra — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
Frequently Asked Questions about P0647 GMC Code
1. What are common symptoms of OBDII code P0647 related to the air conditioning compressor clutch relay control circuit high voltage?
- Common symptoms include the air conditioning system not working, the compressor clutch not engaging, and possible illumination of the check engine light.
2. What are some potential causes of OBDII code P0647 in a GMC vehicle?
- Possible causes include a faulty air conditioning compressor clutch relay, damaged wiring or connectors in the circuit, or a problem with the powertrain control module (PCM).
3. How can I diagnose the issue causing OBDII code P0647 in my GMC related to the air conditioning compressor clutch relay control circuit high voltage?
- Diagnose the issue by checking the relay operation, inspecting the wiring for any damage or corrosion, and testing the voltage at the relay and PCM connections.
4. Can I continue driving my GMC with OBDII code P0647 triggered?
- It is not recommended to drive with the code triggered as it may lead to further damage to the air conditioning system or other related components.
5. How can I repair OBDII code P0647 related to the air conditioning compressor clutch relay control circuit high voltage in my GMC?
- Repair the issue by replacing the faulty relay, repairing any damaged wiring or connectors, and clearing the trouble codes with a diagnostic scanner.
6. Is it possible to reset OBDII code P0647 in a GMC without fixing the underlying issue?
- While it is possible to clear the code temporarily, it is important to address the root cause of the problem to prevent it from reoccurring.
7. Are there any specific tools or equipment I need to repair OBDII code P0647 in my GMC?
- You may need a multimeter to test voltages, a diagnostic scanner to clear the trouble codes, and basic hand tools for accessing and replacing components.
8. How long does it typically take to repair OBDII code P0647 related to the air conditioning compressor clutch relay control circuit high voltage?
- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.
9. Can extreme weather conditions impact the likelihood of OBDII code P0647 being triggered in a GMC?
- Extreme heat or cold can potentially impact the performance of the air conditioning system and the components associated with the compressor clutch relay, increasing the likelihood of the code being triggered.
10. Is it common for OBDII code P0647 in a GMC to be a recurring issue even after repair?
- If the root cause of the issue is not properly addressed during repair, there is a possibility that the code may reoccur. It is important to ensure all components are thoroughly inspected and any underlying issues are resolved.
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