What is the P0647 fault number? What is the description of High failure Air Conditioning (A/C), Clutch Relay Protection How do you fix the P0647 fault code What are the symptoms and causes for the P0647 fault code
What is the P0647 Fault code? What does it signify?
If the powertrain controller module (PCM), and other supporting control modules detect a voltage signal from the A/C clutch relay circuit exceedingly high than manufacturer’s specifications, P0647 is set.
The following control modules will also detect the fault and trigger the code:
- – Alternative fuel control module
- – Body Control Module
- – Antilock brake control module
- – Instrument cluster control module
- – Fuel injection control module
- – Turbo control module
- Anti-theft Module
- – Cruise control module
- – Traction control Module
- Distance warning control module
- Climate control module
The compressor clutch of the A/C compressor is responsible for pressingurizing the A/C system. Relay is part of the compressor clutch. This relay is controlled by the PCM and activates or disables the A/C compressor. This circuit can be quite complex, depending on the vehicle model and the application. It may have more than one control module attached to the relay. The PCM and other control modules will detect excessive voltage in the compressor clutch relay circuit control circuit. A malfunction code P0647 will trigger the check engine light. The fault may have to be repeated 8 times for some vehicles in order for the check engine lamp to light.
The P0647 fault code can affect vehicles of all makes and models, including but not limited to Proton, Duramax Chrysler Dodge Jeep Saab Hyundai and Dodge.
What causes the P0647 Fault code?
This code is usually caused by a defective A/C compressor control relay. Most applications integrate the A/C relay control system into the PCM.
Below are some reasons to set fault code P0647:
- – A/C compressor clutch relay defective
- – Defective A/C compressor clutch
- – Defective air conditioner compressor
- – The relay’s wiring and/or connectors have been damaged, burnt, disconnected, corroded or shorted.
- – Ground wire causing weak electrical signal
- – An issue with the wiring of the CAN (Controller Area Network bus harness)
- – Blown Fuses
- – PCM defect or related control module
What are the symptoms for P0647 Malfunction Codes?
You may experience the following symptoms if your vehicle has the code P0647:
- – Illumination for the check engine light
- – Direct or flashing the A/C fault lights
- – Air conditioner not working properly or at all
- – Other fault codes can be set
How do I fix the P0647 fault code?
There are several repairs that can resolve the P0647 fault code.
- – Repairing broken wires, connectors, or open or short circuit issues associated with the A/C clutch control circuit
- – Replacing A/C clutch relay
- – Replacing blownfuses
- – Cleaning corrosion on connectors
- – Repairing poor electricity connections
- – Replacing the A/C compressor clutch
- How to replace an air conditioner compressor with a fault
- – Repair of damaged wiring or components on the CAN bus
- Troubleshooting PCMs or other control modules
All cables should be thoroughly inspected. Repair or replace any cables that have corroded or burnt. Some models have a lot of relays and fuse because of their complexity. You should inspect them all.
To verify the integrity and safety of cables, modules and other components, conduct continuity testing. Verify all ground wires. Unless otherwise specified, the normal resistance for connections should not exceed 0. If there is no continuity, it could be caused by a problem in the system. Repair it or replace it. If none of that works, check the A/C clutch relay for damage and replace it if necessary.
How serious is the P0647 Fault code?
This code is determined by how care you give to the air conditioner. Some drivers prefer to open their windows and not use the air conditioner. Air conditioning is essential for others. This code is not intended to cause safety issues that could be dangerous for you or your passengers. However, it should always be repaired and diagnosed promptly.
