OBD Guide
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B2071

Stop Light Control Relay Malfunction

B2071 is an OBD-II diagnostic trouble code meaning: Stop Light Control Relay Malfunction. Common causes: faulty brake light relay, open or short circuit in wiring harness. Estimated repair cost: $22–56.

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

Symptoms

  • Brake lights don't work
  • Brake lights flashing
  • The warning light on the dashboard comes on

Causes

  • Faulty brake light relay
  • Open or short circuit in wiring harness
  • Problems with the control unit
  • Contact corrosion

How to Fix

  1. Check the brake light relay for damage
  2. Check the integrity of the wiring harness
  3. Clean relay contacts and connectors
  4. Replace relay if necessary
  5. Check the operation of the brake lights after repair

Related codes

B2070B2072

FAQ

What does the B2071 code mean?

B2071 is an OBD-II diagnostic trouble code that indicates: Stop Light Control Relay Malfunction

What causes a B2071 error code?

The most common causes of B2071 include: Faulty brake light relay; Open or short circuit in wiring harness; Problems with the control unit; Contact corrosion.

How do I fix a B2071 diagnostic trouble code?

To fix B2071: Check the brake light relay for damage. Check the integrity of the wiring harness. Clean relay contacts and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2071?

Limited driving only, diagnose soon

How much does it cost to fix B2071?

The estimated repair cost for B2071 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat