Brake Pressure (Hydraulic System) Sensor Voltage Out of Range
The brake pressure sensor voltage is higher or lower than expected values.
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)
Your brake pressure sensor sends a signal to the computer about how much pressure is in the brake system. If that signal is too high (like over 5 volts) or too low (under 0.5 volts), the computer gets the wrong idea about the brake pressure and flags this code.
What the computer is actually seeing
The engine control module (ECM) is monitoring the input from the brake pressure sensor. It expects a voltage signal that varies between 0.5 volts to 4.5 volts based on brake pedal application. When it detects a voltage outside of this range, it triggers SPN 1725.
What a healthy reading looks like
Brake pressure sensor should output between 0.5 to 4.5 volts under normal conditions.
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.
- 1Check brake fluid level; it should be at the recommended level as specified in the service manual.
- 2Inspect the wiring harness and connectors between the brake pressure sensor and ECM for damage or loose connections.
- 3Using a multimeter, measure the voltage at the brake pressure sensor connector with the key on and engine off. You should see a voltage between 0.5 and 4.5 volts. If not, suspect wiring issues.
- 4If voltage is within range, monitor the voltage while applying brakes. The voltage should increase smoothly. If it jumps or drops erratically, the brake pressure sensor may be faulty.
Common causes
- Wiring issue (frayed, broken, or shorted wire to the sensor)
- Faulty brake pressure sensor
- Poor connector contact at the sensor or ECM
- Corrosion in connectors or sensor ground issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving with this code can impair the brake system's performance, so fix it soon.
Will the code come back after clearing?
If the underlying issue isn't fixed (like a faulty sensor or bad wiring), it will likely return.
Why does this code pair with SPN 1710?
SPN 1710 relates to brake switch inputs; issues with brake pressure often affect switch signals.
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