OBD Guide
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C12B3

ABS Master Cylinder Pressure Sensor Circuit Short To Battery

C12B3 is an OBD-II diagnostic trouble code meaning: ABS Master Cylinder Pressure Sensor Circuit Short To Battery. Common causes: damage to the pressure sensor wiring harness, master cylinder pressure sensor malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • ABS light is on
  • The ABS system does not work or does not work correctly
  • Possible problems with braking on slippery surfaces

Causes

  • Damage to the pressure sensor wiring harness
  • Master cylinder pressure sensor malfunction
  • Short circuit in the circuit
  • Problems with the ABS control unit

How to Fix

  1. Check wiring harness for damage
  2. Measure the resistance of the master cylinder pressure sensor
  3. Check circuit for short circuit
  4. Replace pressure sensor if necessary
  5. Repair or replace wiring harness

Related codes

C12B4C12B1C12B2

FAQ

What does the C12B3 code mean?

C12B3 is an OBD-II diagnostic trouble code that indicates: ABS Master Cylinder Pressure Sensor Circuit Short To Battery

What causes a C12B3 error code?

The most common causes of C12B3 include: Damage to the pressure sensor wiring harness; Master cylinder pressure sensor malfunction; Short circuit in the circuit; Problems with the ABS control unit.

How do I fix a C12B3 diagnostic trouble code?

To fix C12B3: Check wiring harness for damage. Measure the resistance of the master cylinder pressure sensor. Check circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C12B3?

Do not drive — repair immediately

How much does it cost to fix C12B3?

The estimated repair cost for C12B3 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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