OBD Guide
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C12B1

ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible

C12B1 is an OBD-II diagnostic trouble code meaning: ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible. Common causes: abs master cylinder pressure sensor malfunction, malfunction of the brake pedal position sensor. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect ABS operation
  • The ABS indicator on the instrument panel is on
  • Deterioration in braking performance

Causes

  • ABS master cylinder pressure sensor malfunction
  • Malfunction of the brake pedal position sensor
  • Problems with wiring or connections
  • ABS control unit malfunction

How to Fix

  1. Check ABS master cylinder pressure sensor
  2. Check the brake pedal position sensor
  3. Check wiring and connections
  4. If necessary, replace faulty components
  5. Reset the error and check the system operation

Related codes

C12A0C12B0C12C0

FAQ

What does the C12B1 code mean?

C12B1 is an OBD-II diagnostic trouble code that indicates: ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible

What causes a C12B1 error code?

The most common causes of C12B1 include: ABS master cylinder pressure sensor malfunction; Malfunction of the brake pedal position sensor; Problems with wiring or connections; ABS control unit malfunction.

How do I fix a C12B1 diagnostic trouble code?

To fix C12B1: Check ABS master cylinder pressure sensor. Check the brake pedal position sensor. Check wiring and connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C12B1?

Limited driving only, diagnose soon

How much does it cost to fix C12B1?

The estimated repair cost for C12B1 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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