OBD Guide
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C128D

ABS Boost Pressure Sensor Raw Offset Error

C128D is an OBD-II diagnostic trouble code meaning: ABS Boost Pressure Sensor Raw Offset Error. Common causes: pressure sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • The ABS indicator on the dashboard is on
  • Reduced braking performance
  • ABS activation during normal braking
  • Loss of brake booster

Causes

  • Pressure sensor malfunction
  • Open or short circuit in wiring harness
  • Sensor power problems
  • ABS control unit malfunction
  • Sensor is dirty or damaged

How to Fix

  1. Check the sensor wiring harness for damage.
  2. Check the power supply and ground of the sensor
  3. Clean the sensor from dirt
  4. Check sensor resistance
  5. Replace pressure sensor if necessary
  6. Test the ABS system after repair

Related codes

C128EC128FC1290

FAQ

What does the C128D code mean?

C128D is an OBD-II diagnostic trouble code that indicates: ABS Boost Pressure Sensor Raw Offset Error

What causes a C128D error code?

The most common causes of C128D include: Pressure sensor malfunction; Open or short circuit in wiring harness; Sensor power problems; ABS control unit malfunction.

How do I fix a C128D diagnostic trouble code?

To fix C128D: Check the sensor wiring harness for damage.. Check the power supply and ground of the sensor. Clean the sensor from dirt. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C128D?

Limited driving only, diagnose soon

How much does it cost to fix C128D?

The estimated repair cost for C128D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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