Brake Pressure Sensor Circuit Low Input
The brake pressure sensor is sending a low signal to the computer.
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What it means (plain English)
The brake pressure sensor measures how much pressure is in the brake system. If it reports a low pressure when it shouldn't, the computer thinks there's a problem. This could mean the brakes might not work properly, which is dangerous.
What the computer is actually seeing
The computer expects a higher voltage signal (typically around 0.5 to 4.5 volts) from the brake pressure sensor when the brakes are engaged, reflecting the pressure applied to the brake system.
What a healthy reading looks like
The brake pressure should read between 1 to 5 volts when the pedal is pressed, depending on system design.
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 brake fluid level in the reservoir – should be at or above minimum mark. If low, top off fluid and retest.
- 22. Check wiring and connectors for damage or corrosion – repair as needed. Clear code and test drive.
- 33. Use a scan tool to monitor brake pressure sensor voltage while applying brake – should be within 1-5 volts. If voltage is below 0.5 volts, proceed to next step.
- 44. Disconnect the brake pressure sensor and check the voltage at the connector – if there's voltage but not at sensor, replace the sensor. If no voltage, check wiring between the sensor and the module.
Common causes
- Damaged or corroded wiring to the brake pressure sensor
- Faulty brake pressure sensor
- Brake fluid leaks affecting pressure readings
- Poor connector contact or moisture ingress in connector
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with code C1443?
No, the brake system may not function correctly, risking safety.
Will this code come back after fixing?
If the underlying issue is resolved, the code should not return.
Why does this code show up with other codes?
Codes like C1441 or C1442 indicate related brake system issues that can affect the pressure sensor.
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