OBD Guide
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C1426

Stop Light Switch Off Stuck Malfunction

C1426 is an OBD-II diagnostic trouble code meaning: Stop Light Switch Off Stuck Malfunction. Common causes: faulty brake light switch, wiring harness damage. Estimated repair cost: $22–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–56 (est.)

Symptoms

  • Brake lights do not turn on when you press the brake pedal
  • Incorrect operation of cruise control
  • Check Engine light comes on

Causes

  • Faulty brake light switch
  • Wiring harness damage
  • Short circuit in the circuit
  • Problems with switch contacts

How to Fix

  1. Check the operation of the brake lights
  2. Inspect the brake light switch for damage.
  3. Check the circuit and wiring harness for damage
  4. Replace the brake light switch if necessary

Related codes

C1425C1427

FAQ

What does the C1426 code mean?

C1426 is an OBD-II diagnostic trouble code that indicates: Stop Light Switch Off Stuck Malfunction

What causes a C1426 error code?

The most common causes of C1426 include: Faulty brake light switch; Wiring harness damage; Short circuit in the circuit; Problems with switch contacts.

How do I fix a C1426 diagnostic trouble code?

To fix C1426: Check the operation of the brake lights. Inspect the brake light switch for damage.. Check the circuit and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1426?

Limited driving only, diagnose soon

How much does it cost to fix C1426?

The estimated repair cost for C1426 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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