OBD Guide
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B1C37

Master Lock Switch

B1C37 is an OBD-II diagnostic trouble code meaning: Master Lock Switch. Common causes: malfunction of the main lock switch, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Central locks don't work
  • Problems with locking/unlocking doors
  • Flashing hazard lights

Causes

  • Malfunction of the main lock switch
  • Open or short circuit in wiring harness
  • Problems with the door control module

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the operation of the main lock switch
  3. Replace faulty switch or control module

Related codes

B1C36B1C38

FAQ

What does the B1C37 code mean?

B1C37 is an OBD-II diagnostic trouble code that indicates: Master Lock Switch

What causes a B1C37 error code?

The most common causes of B1C37 include: Malfunction of the main lock switch; Open or short circuit in wiring harness; Problems with the door control module.

How do I fix a B1C37 diagnostic trouble code?

To fix B1C37: Check the integrity of the wiring harness. Check the operation of the main lock switch. Replace faulty switch or control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C37?

Limited driving only, diagnose soon

How much does it cost to fix B1C37?

The estimated repair cost for B1C37 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat