Hydraulic Pump Supply Voltage Circuit/Open

Common symptoms

What you'll notice

• Inspect all wiring and connections related to the hydraulic pump supply voltage circuit for any loose or damaged components.
• Test the voltage output of the hydraulic pump to ensure it is within the recommended range.
• If the voltage is low, check and clean the battery terminals and connectors, as low battery voltage can affect the hydraulic pump circuit.
• If all else fails, replace the hydraulic pump itself.

Common causes

Most likely first

1. Faulty hydraulic pump
2. Loose or damaged wiring in the hydraulic pump supply circuit
3. Malfunctioning hydraulic pump relay
4. Defective hydraulic pump control module
5. Electrical issue in the hydraulic pump supply circuit (e.g., blown fuse)

How to diagnose & fix

Work through it in order

1. Decreased hydraulic pressure
2. Unusual noises or knocking sounds from the hydraulic system
3. Hydraulic leaks or fluid loss
4. Inconsistent or erratic functioning of the hydraulic system