OBD Guide
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C1380

Stop Light Control Relay Malfunction

C1380 is an OBD-II diagnostic trouble code meaning: Stop Light Control Relay Malfunction. Common causes: brake light relay malfunction, open or short circuit in wiring harness. Estimated repair cost: $22–56.

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

Symptoms

  • Brake lights don't turn on
  • Brake lights do not work correctly (for example, they are constantly on)
  • The warning light on the dashboard comes on

Causes

  • Brake light relay malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Problems with the control unit

How to Fix

  1. Check brake light relay (replace if necessary)
  2. Inspect the wiring harness for damage
  3. Check contacts in connectors
  4. Test the control unit

Related codes

C1381C1382

FAQ

What does the C1380 code mean?

C1380 is an OBD-II diagnostic trouble code that indicates: Stop Light Control Relay Malfunction

What causes a C1380 error code?

The most common causes of C1380 include: Brake light relay malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Problems with the control unit.

How do I fix a C1380 diagnostic trouble code?

To fix C1380: Check brake light relay (replace if necessary). Inspect the wiring harness for damage. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1380?

Limited driving only, diagnose soon

How much does it cost to fix C1380?

The estimated repair cost for C1380 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat