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P0947 is a diagnostic trouble code (DTC) for "Hydraulic Pump Relay Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0947 code is a generic powertrain code related to the transmission, including pressure faults and sensor failures. In this case, the transmission control module has detected a low voltage signal coming from the hydraulic pump relay circuit.
A vehicle utilizes the pump to generate hydraulic pressure. Channels direct the transmission fluid in an automatic transmission to the valve body. The shift solenoid valves and pressure control solenoid valves are both located in the valve body. The transmission control module manages and activates electronically controlled valves, which are utilized for gear shifting. In particular, the shift solenoid manages the clutch, brakes, and bands in the transmission while the pressure control solenoid valve (one or more) manages the hydraulic pressure inside the vehicle’s transmission.
A code P0947 will be stored when the transmission control valve receives a voltage signal lower than manufacturer-specific allowed variations from one of the valves.
Several problems may cause a P0947 code including:
Symptoms of a P0947 code may include:
A mechanic may use several methods to diagnose a P0947 trouble code, including:
With any transmission-related fault code, it is recommended to check transmission fluid levels and quality, test drive the vehicle, and rescan to see if the code reappears prior to performing more complicated diagnosis and repairs.
Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0947 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0947 trouble code and include:
Fill transmission fluid to manufacturer-recommended levels
Change or perform a transmission fluid flush, if necessary
Replace damaged or defective harness from transmission control module to transmission
Replace damaged or defective hydraulic pump
Replace damaged or defective transmission control module
Replace damaged or defective ECM
Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear
The pressure control solenoid valve is often located inside the transmission, which can be a difficult repair. It is recommended to utilize a professional for diagnosis and repair for a P0947 code.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.