Hydraulic Pump Motor Circuit
This code indicates an issue with the hydraulic pump motor circuit in the anti-lock brake system (ABS).
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer is saying there's a problem with the electrical connection to the ABS hydraulic pump. It might not be turning on or getting the right power.
What the computer is actually seeing
The ABS control module monitors the hydraulic pump motor for operation. It looks for correct voltage (typically around 12V) and expected current draw during normal operation. If the pump is not functioning or the circuit is open/shorted, the module sets the code.
What a healthy reading looks like
The expected voltage at the hydraulic pump's connector should be around 12V when the ABS is active. Current draw can vary but usually should be between 3-10A when running.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors leading to the hydraulic pump for any visible damage or corrosion. If any damage is found, repair or replace the wiring/connectors. DECISION POINT: Is the wiring and connectors in good condition? (Yes/No)
- 22. Check the fuse for the ABS pump circuit. If blown, replace and test. DECISION POINT: Did the fuse blow again? (Yes/No)
- 33. With a multimeter, check for power at the hydraulic pump connector when the ignition is on and the ABS is activated. You should see around 12V. DECISION POINT: Is there 12V at the connector? (Yes/No)
- 44. If there is no power, check the ABS control module outputusing a scan tool. If the control module is providing voltage, the issue lies with the pump. If no voltage is being sent, consider replacing the ABS control module. DECISION POINT: Is the ABS control module sending power? (Yes/No)
- 55. If the pump is receiving power but not functioning, replace the hydraulic pump motor.
Common causes
- Corroded or damaged wiring in the hydraulic pump circuit
- Faulty hydraulic pump motor
- Defective ABS control module
- Blown fuse related to the ABS system
- Bad connectors or loose electrical connections
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but the ABS will likely be non-functional, affecting stopping in slippery conditions.
Will this code come back after I fix it?
If you properly repair the circuit or replace faulty components, the code should not return.
Why did this code appear after a brake job?
If the hydraulic pump was disconnected or the circuit was disturbed during the brake job, this could trigger the code.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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