OBD Guide
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C1325

Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault

C1325 is an OBD-II diagnostic trouble code meaning: Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault. Common causes: open or short circuit in the sensor circuit (wire harness), malfunction of the piston displacement sensor itself. Estimated repair cost: $17–89.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • ABS/ESP malfunction indicator is on
  • Reduced braking performance
  • Activating the emergency brake system
  • Uneven brake application

Causes

  • Open or short circuit in the sensor circuit (wire harness)
  • Malfunction of the piston displacement sensor itself
  • Problems with the master cylinder
  • Low brake fluid level
  • Contact corrosion or connector damage
  • Malfunction of the ABS/ESP control unit

How to Fix

  1. Check the brake fluid level
  2. Inspect the wiring harness and sensor connectors for damage.
  3. Check sensor resistance and circuit continuity
  4. Clean the connector contacts or replace damaged wiring elements
  5. If necessary, replace the piston displacement sensor
  6. Carry out diagnostics of the ABS/ESP control unit
  7. Reset the error and check the system

Related codes

C1324C1326C1327C1235

FAQ

What does the C1325 code mean?

C1325 is an OBD-II diagnostic trouble code that indicates: Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault

What causes a C1325 error code?

The most common causes of C1325 include: Open or short circuit in the sensor circuit (wire harness); Malfunction of the piston displacement sensor itself; Problems with the master cylinder; Low brake fluid level.

How do I fix a C1325 diagnostic trouble code?

To fix C1325: Check the brake fluid level. Inspect the wiring harness and sensor connectors for damage.. Check sensor resistance and circuit continuity. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1325?

Limited driving only, diagnose soon

How much does it cost to fix C1325?

The estimated repair cost for C1325 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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