OBD Guide
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C1224

Lamp Brake Warning Output Circuit Open

C1224 is an OBD-II diagnostic trouble code meaning: Lamp Brake Warning Output Circuit Open. Common causes: open or short circuit in wiring harness, warning light fault. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–167 (est.)

Symptoms

  • The brake system warning light does not light up when the ignition is turned on.
  • The lamp is constantly on, even if the system is working properly
  • Lamp blinks for no obvious reason

Causes

  • Open or short circuit in wiring harness
  • Warning light fault
  • Problems with the ABS module or control unit
  • Poor contact in connectors

How to Fix

  1. Check the integrity of the lamp control circuit wiring harness
  2. Check the serviceability of the warning lamp
  3. Check connections and contacts in the circuit
  4. Scan the ABS system for additional errors
  5. Replace faulty circuit components

Related codes

C1214C1215C1225

FAQ

What does the C1224 code mean?

C1224 is an OBD-II diagnostic trouble code that indicates: Lamp Brake Warning Output Circuit Open

What causes a C1224 error code?

The most common causes of C1224 include: Open or short circuit in wiring harness; Warning light fault; Problems with the ABS module or control unit; Poor contact in connectors.

How do I fix a C1224 diagnostic trouble code?

To fix C1224: Check the integrity of the lamp control circuit wiring harness. Check the serviceability of the warning lamp. Check connections and contacts in the circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1224?

Do not drive — repair immediately

How much does it cost to fix C1224?

The estimated repair cost for C1224 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat