P0647 OBD-II: A/C Clutch Relay Control Circuit High
P0647 Severity
Will P0647 go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P0647?
The engine control module (PCM) uses a relay to control voltage to the A/C Compressor Clutch. The A/C clutch engages, allowing the Air Conditioning system to operate. When the PCM is unable to control the relay, code P0647 will set.
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OBD II Fault Code
- OBD II P0647
OBD-II Code A/C may not operate is defined as a A/C Clutch Relay Control Circuit High
The engine control module (PCM) uses a relay to control voltage to the A/C Compressor Clutch. The A/C clutch engages, allowing the Air Conditioning system to operate. When the PCM is unable to control the relay, code P0647 will set.
A/C may not operate Symptoms
- A/C may not operate
Common Problems That Trigger the P0647 Code
- A/C compressor failure
- A/C compressor relay failure
- Powertrain Control Module (PCM) failure
- Wiring issue
Common Repairs Needed for the P0647 Code
Ask our experts about P0647.
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