OBD Guide
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C122B

Brake Booster Pedal Force Switch Circuit Performace

C122B is an OBD-II diagnostic trouble code meaning: Brake Booster Pedal Force Switch Circuit Performace. Common causes: open or shorted wiring harness, pedal force sensor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Check Engine light comes on
  • Incorrect operation of the brake system
  • Increased braking distance
  • Problems with ABS/ESP systems

Causes

  • Open or shorted wiring harness
  • Pedal force sensor malfunction
  • Poor contact in connectors
  • Problems with the brake ECU

How to Fix

  1. Check wiring harness for damage
  2. Check sensor connections and connectors
  3. Test the pedal force sensor
  4. If necessary, replace the sensor or wiring harness
  5. Reset the error and check the system

Related codes

C122AC122CC0051

FAQ

What does the C122B code mean?

C122B is an OBD-II diagnostic trouble code that indicates: Brake Booster Pedal Force Switch Circuit Performace

What causes a C122B error code?

The most common causes of C122B include: Open or shorted wiring harness; Pedal force sensor malfunction; Poor contact in connectors; Problems with the brake ECU.

How do I fix a C122B diagnostic trouble code?

To fix C122B: Check wiring harness for damage. Check sensor connections and connectors. Test the pedal force sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C122B?

Do not drive — repair immediately

How much does it cost to fix C122B?

The estimated repair cost for C122B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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