OBD Guide
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B16B1

Left Stop Lamp Control Circuit High

B16B1 is an OBD-II diagnostic trouble code meaning: Left Stop Lamp Control Circuit High. Common causes: short circuit to positive in the brake light circuit, brake light relay malfunction. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Left brake light flashing or constantly on
  • Dashboard warning
  • Left brake light not working

Causes

  • Short circuit to positive in the brake light circuit
  • Brake light relay malfunction
  • Problems with the lighting control module
  • Wiring harness damage
  • Contact corrosion

How to Fix

  1. Check brake light circuit fuse
  2. Inspect the wiring harness for damage
  3. Check brake light relay
  4. Diagnose the lighting control module
  5. Check contacts and connectors

Related codes

B16B2B16B0

FAQ

What does the B16B1 code mean?

B16B1 is an OBD-II diagnostic trouble code that indicates: Left Stop Lamp Control Circuit High

What causes a B16B1 error code?

The most common causes of B16B1 include: Short circuit to positive in the brake light circuit; Brake light relay malfunction; Problems with the lighting control module; Wiring harness damage.

How do I fix a B16B1 diagnostic trouble code?

To fix B16B1: Check brake light circuit fuse. Inspect the wiring harness for damage. Check brake light relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B16B1?

Limited driving only, diagnose soon

How much does it cost to fix B16B1?

The estimated repair cost for B16B1 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat