Hydraulic Pump Motor Control Circuit Malfunction
The control circuit for the hydraulic pump motor has a malfunction.
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)
Inside the ABS module, there's a hydraulic pump that helps with brake pressure. When this code shows up, it means the pump isn't getting the right signals or power, so it can't help with braking when needed.
What the computer is actually seeing
The computer expects to see a voltage or resistance within a certain range that indicates the hydraulic pump is functioning correctly. If it sees low voltage (below 10 volts) or an open circuit, it sets this code.
What a healthy reading looks like
Voltage to the pump motor should be around 12-14 volts when activated and resistance should be under 5 ohms when checking the pump motor circuit.
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. Check the brake fluid level; top off if low and retest the system. Decision: If code returns, proceed to step 2. If not, issue resolved.
- 22. Inspect wiring and connectors going to the hydraulic pump motor for any damage, corrosion or loose connections. Decision: If damage is found, repair it and retest. If not damaged, proceed to step 3.
- 33. Measure voltage at the hydraulic pump connector while activating the pump. You should see 12-14 volts. Decision: If voltage is present, the pump motor is likely faulty; if not, proceed to step 4.
- 44. Test the resistance of the hydraulic pump motor; it should be under 5 ohms. Decision: If resistance is within spec, replace the ABS module; if resistance is high or open, replace the hydraulic pump motor.
Common causes
- Damaged wiring or connectors in the hydraulic pump circuit
- Faulty hydraulic pump motor
- Defective ABS module
- Low brake fluid level affecting pump operation
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable, as it may affect your braking performance.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will return.
Why does this code sometimes pair with other codes?
Codes can be related if multiple systems share components, like wiring or the same control module.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →