Hydraulic Pump Motor Circuit Malfunction
The hydraulic pump motor circuit 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)
There’s a problem with the hydraulic pump motor that helps control your brakes. If it fails, you'll lose braking assistance, which is a safety issue.
What the computer is actually seeing
The computer monitors the voltage and current signals on the hydraulic pump motor circuit. If it detects an out-of-spec voltage (below 9V or above 16V when active) or an electrical failure in the circuit, it triggers code C1252.
What a healthy reading looks like
Ideal voltage for the hydraulic pump motor circuit is typically between 9V and 16V during operation.
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 wiring and connectors for damage or corrosion. Repair as necessary. Decision: Are the connections secure and clean? Yes: Proceed. No: Repair connections.
Common causes
- Damaged wiring in the hydraulic pump motor circuit
- Faulty hydraulic pump motor
- Corroded connectors
- Low brake fluid level
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, you risk losing brake assistance, which can be dangerous.
Will this issue come back after a reset?
If not properly fixed, the code will likely return.
Why does this code show with other codes?
Codes can often be related; for example, if the pump fails, other brake system codes may also trigger.
Working a real vehicle right now?
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