AutoCodes – Toyota – B2071 Toyota

B2071 Toyota Code - Stop Light Control Relay Malfunction

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when the master cylinder solenoid (Skid Control ECU) detects that the brake light relay is malfunctioning and transmits this to the seat belt control ECU via CAN communication. Common causes include Faulty Vehicle Stability Control System, Faulty Seat Belt Control ECU. 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 Toyota indicates Stop Light Control Relay Malfunction.
Common causes: Common causes include Faulty Vehicle Stability Control System, Faulty Seat Belt Control ECU.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 575

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B2071 Toyota Description

OBDII Code B2071 Toyota - Stop Light Control Relay Malfunction - AutoCodes.com — B2071 Toyota Code - Stop Light Control Relay Malfunction

What does this mean?

What are the Possible Causes of the DTC B2071 Toyota?

Faulty Vehicle Stability Control System
Faulty Seat Belt Control ECU

How to Fix the DTC B2071 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2071 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B2071 Toyota code?

Need more information on how to fix the B2071 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2071 Toyota code diagnosed by a professional: Find a repair shop in your area

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 Toyota Code

What does OBDII code B2071 mean for a Toyota vehicle?

OBDII code B2071 indicates a malfunction in the stop light control relay, which is responsible for operating the brake lights.

What are the common symptoms associated with the B2071 code?

Common symptoms include non-functioning brake lights, dashboard warning lights, and potential issues with the cruise control system.

What could cause the B2071 code to trigger?

Possible causes include a faulty stop light control relay, wiring issues, blown fuses, or problems with the brake light switch.

How can I diagnose the B2071 code?

To diagnose the B2071 code, check the stop light relay and associated wiring for damage, test the brake light switch, and inspect fuses for continuity.

What should I do if my brake lights are not working and the B2071 code is present?

Start by checking the brake light relay and switch, replace any blown fuses, and ensure the wiring is intact. If issues persist, consider consulting a professional mechanic.

Can I drive my vehicle with the B2071 code?

While you can drive the vehicle, it is not safe to do so if the brake lights are not functioning, as this can create a hazard on the road.

Is it necessary to reset the OBDII code after repairs?

Yes, after repairing the issue related to the B2071 code, it is recommended to clear the code using an OBDII scanner to reset the system.

How much does it typically cost to fix a B2071 code issue?

Repair costs can vary widely but may range from $50 to $200 depending on whether it involves replacing the relay, switch, or other components.

Can I fix the B2071 code issue myself?

If you have basic automotive repair skills, you may be able to troubleshoot and replace the stop light relay or switch. However, if you're unsure, it's best to seek professional help.

What should I check if my brake lights are working intermittently and the B2071 code is present?

Intermittent brake light issues may indicate a failing relay or a poor connection in the wiring. Inspect the relay, connectors, and the brake light switch for any signs of wear or damage.