OBD Guide
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C122C

Brake Booster Pedal Force Switch Circuit Supply Voltage

C122C is an OBD-II diagnostic trouble code meaning: Brake Booster Pedal Force Switch Circuit Supply Voltage. Common causes: open or short circuit in wiring harness, brake pedal force switch malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Check Engine Light Is On
  • Incorrect operation of the braking system
  • Problems with ABS or ESP

Causes

  • Open or short circuit in wiring harness
  • Brake pedal force switch malfunction
  • Problems with the brake system control unit
  • Corroded contacts or poor connection

How to Fix

  1. Check wiring harness for damage
  2. Check the voltage at the brake pedal switch
  3. Replace the brake pedal force switch if necessary
  4. Check connections and contacts for corrosion

Related codes

C122DC122EC122F

FAQ

What does the C122C code mean?

C122C is an OBD-II diagnostic trouble code that indicates: Brake Booster Pedal Force Switch Circuit Supply Voltage

What causes a C122C error code?

The most common causes of C122C include: Open or short circuit in wiring harness; Brake pedal force switch malfunction; Problems with the brake system control unit; Corroded contacts or poor connection.

How do I fix a C122C diagnostic trouble code?

To fix C122C: Check wiring harness for damage. Check the voltage at the brake pedal switch. Replace the brake pedal force switch if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C122C?

Limited driving only, diagnose soon

How much does it cost to fix C122C?

The estimated repair cost for C122C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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