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Engine-Codes – Lexus – B2071 Lexus

B2071 Lexus Code - Stop Light Control Relay Malfunction

Quick Answer

The B2071 diagnostic trouble code (DTC) for Lexus vehicles refers to a Stop Light Control Relay Malfunction. Common causes include Faulty stop light control relay, Corroded or damaged wiring connections, Loose or damaged wiring harness. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B2071 Lexus indicates Stop Light Control Relay Malfunction.
Common causes
Common causes include Faulty stop light control relay, Corroded or damaged wiring connections, Loose or damaged wiring harness.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code B2071 Lexus Description

The B2071 diagnostic trouble code (DTC) for Lexus vehicles refers to a Stop Light Control Relay Malfunction. This code indicates that there is an issue with the relay responsible for controlling the stop lights on the vehicle. The stop light control relay plays a crucial role in activating the stop lights when the brake pedal is pressed, signaling to other drivers that the vehicle is slowing down or coming to a stop.

OBDII Code B2071 Lexus - Stop Light Control Relay Malfunction
B2071 Lexus Code - Stop Light Control Relay Malfunction

Common Causes of B2071 Lexus

  1. Faulty stop light control relay.
  2. Corroded or damaged wiring connections.
  3. Loose or damaged wiring harness.
  4. Electrical short circuit in the stop light circuit.
  5. Internal component failure within the stop light control relay.

Symptoms of B2071 Lexus

  1. Stop lights not illuminating when the brake pedal is pressed.
  2. Stop lights remaining on constantly, even when the brake pedal is not pressed.
  3. Inconsistent operation of the stop lights.
  4. Dashboard warning light indicating a brake system malfunction.

How to Fix B2071 Lexus

  1. Begin by locating the stop light control relay, typically found in the fuse box or relay panel under the hood or inside the vehicle.
  2. Inspect the wiring connections and harness for any signs of damage, corrosion, or looseness. Repair or replace as needed.
  3. Test the stop light control relay using a multimeter to determine if it is functioning properly. Replace the relay if it fails the test.
  4. Clear the DTC from the vehicle's computer using an OBD-II scanner to reset the system.
  5. Test the vehicle to ensure that the stop lights are functioning correctly after the repair.

Cost to Fix B2071 Lexus

The cost of repairing a Stop Light Control Relay Malfunction can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair for this code may range from $100 to $300, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to get a more accurate estimate. Additionally, the cost may be higher if the issue requires more extensive repairs or replacement of components.

Need more information about the B2071 Lexus code?

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2071 Lexus Code

1. What are the common symptoms of OBDII code B2071 in a Lexus related to Stop Light Control Relay Malfunction?

The common symptoms include non-functional brake lights, intermittent brake light operation, and dashboard warning lights related to the brake system.

2. What could cause the OBDII code B2071 related to Stop Light Control Relay Malfunction in a Lexus?

Possible causes include a faulty stop light control relay, damaged wiring or connectors in the brake light circuit, or a problem with the brake light switch.

3. How can I diagnose the OBDII code B2071 in my Lexus for Stop Light Control Relay Malfunction?

You can use a diagnostic scanner to retrieve the specific code, inspect the brake light circuit for any visible damage, and test the stop light control relay for proper functionality.

4. Can I still drive my Lexus with the OBDII code B2071 related to Stop Light Control Relay Malfunction?

It is not recommended to drive the vehicle with faulty brake lights, as it can pose a safety risk to you and other drivers on the road.

5. What are the repair options for fixing OBDII code B2071 in a Lexus due to Stop Light Control Relay Malfunction?

Repair options include replacing the faulty stop light control relay, repairing any damaged wiring or connectors, and ensuring the brake light switch is functioning correctly.

6. Is it possible to reset the OBDII code B2071 related to Stop Light Control Relay Malfunction in my Lexus?

Resetting the code may temporarily turn off the warning light, but it will reappear if the underlying issue causing the malfunction is not addressed.

7. How much does it typically cost to repair OBDII code B2071 in a Lexus for Stop Light Control Relay Malfunction?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix OBDII code B2071 related to Stop Light Control Relay Malfunction in a Lexus?

If you have experience working on automotive electrical systems, you may be able to diagnose and repair the issue yourself. However, it is recommended to seek professional help if you are unsure.

9. Will OBDII code B2071 in a Lexus affect the vehicle's overall performance?

While the code itself may not affect performance, the underlying issue with the brake lights can impact safety and visibility on the road.

10. How often does the OBDII code B2071 related to Stop Light Control Relay Malfunction occur in Lexus vehicles?

The occurrence of this code can vary, but it is not an uncommon issue in Lexus vehicles with faulty stop light control relays or brake light circuit problems.

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