OBD Guide
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C1424

Master Cylinder Pressure Sensor Output Malfunction

C1424 is an OBD-II diagnostic trouble code meaning: Master Cylinder Pressure Sensor Output Malfunction. Common causes: malfunction or failure of the master cylinder pressure sensor, open or short circuit in the sensor power supply circuit. Estimated repair cost: $44–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$44–167 (est.)

Symptoms

  • The ABS, ESP or Brake light on the panel lights up
  • Disabling the stabilization system (ESP)
  • Hard or unstable brake pedal
  • Incorrect operation of ABS during emergency braking
  • Storing a fault code in the ECU memory

Causes

  • Malfunction or failure of the master cylinder pressure sensor
  • Open or short circuit in the sensor power supply circuit
  • Air or moisture getting into the brake line
  • ABS/ESP unit malfunction
  • Brake fluid leak in the sensor area

How to Fix

  1. Connect a diagnostic scanner and read all ABS/ESP fault codes
  2. Check the supply voltage and integrity of the pressure sensor wiring
  3. Inspect the brake master cylinder for brake fluid leaks.
  4. Replace the pressure sensor if it is confirmed to be faulty
  5. Bleed the brake system to remove air
  6. Reset codes and test drive to check functionality

Related codes

C1425C1426C1210C1220

FAQ

What does the C1424 code mean?

C1424 is an OBD-II diagnostic trouble code that indicates: Master Cylinder Pressure Sensor Output Malfunction

What causes a C1424 error code?

The most common causes of C1424 include: Malfunction or failure of the master cylinder pressure sensor; Open or short circuit in the sensor power supply circuit; Air or moisture getting into the brake line; ABS/ESP unit malfunction.

How do I fix a C1424 diagnostic trouble code?

To fix C1424: Connect a diagnostic scanner and read all ABS/ESP fault codes. Check the supply voltage and integrity of the pressure sensor wiring. Inspect the brake master cylinder for brake fluid leaks.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1424?

Limited driving only, diagnose soon

How much does it cost to fix C1424?

The estimated repair cost for C1424 is $44–167. Actual cost depends on your vehicle, location, and labor rates.

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