OBD Guide
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C129A

Brake Pedal Position Sensor 3 Circuit Low Input

C129A is an OBD-II diagnostic trouble code meaning: Brake Pedal Position Sensor 3 Circuit Low Input. Common causes: malfunction of the brake pedal position sensor, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • ABS/ESP fault lamp is on
  • Loss of ABS braking function
  • Incorrect operation of cruise control

Causes

  • Malfunction of the brake pedal position sensor
  • Open or short circuit in wiring harness
  • Poor contact in the sensor connector
  • Problems with power supply or sensor ground

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Check the contacts in the sensor connector for oxidation or damage.
  3. Measure the resistance and voltage at the sensor
  4. If necessary, replace the brake pedal position sensor

Related codes

C1298C1299C129B

FAQ

What does the C129A code mean?

C129A is an OBD-II diagnostic trouble code that indicates: Brake Pedal Position Sensor 3 Circuit Low Input

What causes a C129A error code?

The most common causes of C129A include: Malfunction of the brake pedal position sensor; Open or short circuit in wiring harness; Poor contact in the sensor connector; Problems with power supply or sensor ground.

How do I fix a C129A diagnostic trouble code?

To fix C129A: Check the integrity of the sensor wiring harness. Check the contacts in the sensor connector for oxidation or damage.. Measure the resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C129A?

Do not drive — repair immediately

How much does it cost to fix C129A?

The estimated repair cost for C129A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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