• Transmission may not shift properly
• Check Engine Light illuminated
• Potential limp mode activation
• Faulty hydraulic pump relay
• Open or shorted wiring in the hydraulic pump relay circuit
• Faulty transmission control module (TCM)
Transmission Control Module (TCM): A computer that controls the transmission's operation.
Hydraulic Pump Relay: A relay that supplies power to the hydraulic pump in the transmission.
• P0948
• P0949
Hydraulic Pump Relay/Control Circuit Low
This code means that the computer in the car is having trouble controlling a part that helps move the car's gears. It's like when a switch in a toy doesn't work right and the toy can't move properly.
The P0947 code indicates that the transmission control module (TCM) has detected a low voltage or an open circuit in the hydraulic pump relay or control circuit.
The hydraulic pump relay is responsible for supplying power to the hydraulic pump used in some automatic transmissions. When the TCM detects a low voltage or an open circuit in this relay or its control circuit, it triggers the P0947 code. This can affect the transmission's ability to shift gears properly.
• Use an OBD-II scanner to confirm the P0947 code.
• Inspect the wiring and connectors for the hydraulic pump relay.
• Test the hydraulic pump relay for proper operation.
• Replace the faulty hydraulic pump relay.
• Repair or replace damaged wiring or connectors.
• Replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $500
Moderate
• Ford Focus
• Chevrolet Malibu
• Honda Accord
• Regularly inspect and maintain transmission components.
• Ensure electrical connections are clean and secure.
• Follow the vehicle's maintenance schedule.
Transmission Control Issue
• Avoid driving the vehicle until the issue is diagnosed.
• Consult a professional mechanic for accurate diagnosis.
• Regularly check for any transmission fluid leaks.
Check with your vehicle manufacturer for warranty coverage on transmission components.
The P0947 code has been associated with transmission control issues in vehicles with electronic control systems.
Moderate – Addressing this issue promptly can prevent further transmission damage.
Driving with transmission issues can be unsafe and may cause further damage to the vehicle.
• Vehicle at operating temperature
• Transmission in Drive or Reverse
The hydraulic pump relay is typically located in the engine bay fuse box or near the transmission.
Q: Can I drive with a P0947 code?
A: It's not recommended to drive with this code as it can lead to transmission damage.
Q: How do I clear a P0947 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is fixed first.
