P0945 Fault Code

Hydraulic Pump Relay Circuit / Open

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0945 fault code indicates an issue with the hydraulic pump relay circuit. This may involve an open circuit which prevents the hydraulic pump from functioning properly, leading to potential performance issues in the vehicle's hydraulic systems, such as the steering or transmission systems.

What are the symptoms of the P0945 code?

Symptoms of a P0945 fault code may include:

• Increased difficulty in steering due to a lack of hydraulic assist.
• Delayed or unresponsive gear changes in automatic transmissions.
• Warning lights on the dashboard, particularly those related to power steering or transmission systems.
• Unusual noises from the hydraulic pump indicating it is not receiving adequate power.

What causes the P0945 code?

Common causes of the P0945 code include:

• A faulty hydraulic pump relay that is not providing power to the pump.
• Open or damaged wiring in the circuit that connects the relay to the pump.
• Poor connections or corrosion at terminals affecting electrical flow.
• Issues with the vehicle's control module that manages the hydraulic pump operation.

How to fix P0945?

To address a P0945 fault code, consider the following steps:

• Inspect the hydraulic pump relay for functionality and replace it if it is faulty.
• Check the wiring and connectors in the relay circuit for signs of damage or corrosion, and repair as necessary.
• Use a multimeter to test the circuit's continuity and ensure proper electrical flow.
• If the problem persists, diagnose the vehicle’s control module to identify any underlying issues affecting the relay operation.