P0647 Chevrolet 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 Chevrolet 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 Chevrolet Description
What are the Possible Causes of the DTC P0647 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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.
Need more information about the P0647 Chevrolet code?
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Need Help with the Code?
Get the P0647 Chevrolet code diagnosed by a professional: Find a repair shop in your area
Information for Specific Chevrolet Models
- P0647 2014 Chevrolet Silverado — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2015 Chevrolet Silverado — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2016 Chevrolet Silverado — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2017 Chevrolet Silverado — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
- P0647 2018 Chevrolet Silverado — Air Conditioning Compressor Clutch Relay Control Circuit High Voltage
Frequently Asked Questions about P0647 Chevrolet Code
1. What does the OBDII code P0647 mean on a Chevrolet?
P0647 indicates a high voltage issue in the Air Conditioning (A/C) Compressor Clutch Relay Control Circuit, which may affect the A/C system's operation.
2. What are the common symptoms of code P0647 in a Chevrolet?
Symptoms include the A/C not working, the A/C compressor failing to engage, and possibly an illuminated check engine light.
3. What causes the P0647 code to appear on a Chevrolet?
Common causes include a faulty A/C compressor clutch relay, damaged wiring or connectors in the A/C control circuit, a failed A/C control module, or a short to power in the circuit.
4. Can I still drive my Chevrolet with code P0647?
Yes, you can drive the vehicle, but the A/C system may not function properly, and ignoring the issue could lead to further electrical or A/C system damage.
5. How do you diagnose the P0647 code on a Chevrolet?
Diagnosis typically involves inspecting the A/C compressor clutch relay, checking the circuit wiring and connectors for damage, and using a multimeter to test for proper voltage and continuity.
6. What repairs can fix the P0647 code on a Chevrolet?
Repairs may include replacing the A/C compressor clutch relay, repairing or replacing damaged wiring or connectors, or replacing a faulty A/C control module.
7. Could a blown fuse trigger the P0647 code on a Chevrolet?
Yes, a blown fuse related to the A/C system could disrupt the circuit and potentially trigger the P0647 code.
8. How much does it typically cost to repair the P0647 code on a Chevrolet?
Repair costs vary but may range from $50 to $300, depending on whether the issue is a simple relay replacement or involves more extensive wiring repairs.
9. Can a faulty A/C compressor cause the P0647 code on a Chevrolet?
While not common, a faulty A/C compressor could potentially contribute to issues in the relay control circuit and trigger the P0647 code.
10. How can I prevent the P0647 code from reoccurring on my Chevrolet?
Regularly inspect and maintain your vehicle’s electrical connections, ensure the A/C system is serviced as needed, and promptly address any signs of electrical issues.
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