OBD Guide
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C1294

Brake Lamp Switch Circuit Always Active

C1294 is an OBD-II diagnostic trouble code meaning: Brake Lamp Switch Circuit Always Active. Common causes: faulty brake light switch, short circuit in the circuit. Estimated repair cost: $22–56.

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

Symptoms

  • Check Engine Light Is On
  • Incorrect operation of ABS or ESP
  • Disabling cruise control
  • Constantly lit brake lights

Causes

  • Faulty brake light switch
  • Short circuit in the circuit
  • Wiring harness damage
  • Circuit Grounding Problems
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the condition of the brake light switch
  2. Check the circuit for short circuit
  3. Inspect the wiring harness for damage
  4. Check circuit grounding
  5. If necessary, replace the brake light switch or repair the wiring harness

Related codes

C1295C1296P0571

FAQ

What does the C1294 code mean?

C1294 is an OBD-II diagnostic trouble code that indicates: Brake Lamp Switch Circuit Always Active

What causes a C1294 error code?

The most common causes of C1294 include: Faulty brake light switch; Short circuit in the circuit; Wiring harness damage; Circuit Grounding Problems.

How do I fix a C1294 diagnostic trouble code?

To fix C1294: Check the condition of the brake light switch. Check the circuit for short circuit. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1294?

Limited driving only, diagnose soon

How much does it cost to fix C1294?

The estimated repair cost for C1294 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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