AutoCodes – Generic – B2143

B2143 Code - Outside Rearview Mirror Reached Limit Of Travel

Quick Answer

Outside rearview mirror switch supplies inputs to Memory Mirror Module (MMM) to drive outside rearview mirrors horizontal and vertical motors. Common causes include Faulty Outside Rearview Mirror Switch, Outside Rearview Mirror Switch harness is open or shorted, Outside Rearview Mirror Switch circuit poor electrical connection. 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: B2143 indicates Outside Rearview Mirror Reached Limit Of Travel.
Common causes: Common causes include Faulty Outside Rearview Mirror Switch, Outside Rearview Mirror Switch harness is open or shorted, Outside Rearview Mirror Switch circuit poor electrical connection.
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.

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Code Popularity 9,934

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 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2143 Description

Outside rearview mirror switch supplies inputs to Memory Mirror Module (MMM) to drive outside rearview mirrors horizontal and vertical motors. Outside rearview mirror switch must be in either L or R position in order to operate outside rearview mirror. When outside rearview mirror switch is actuated, the battery voltage input signal and the ground input signal is sent to MMM. When MMM recognizes input combination, it moves the appropriate mirror to the requested direction. If MMM does not recognize input combination as a valid input, it ignores combination and does not move outside rearview mirror.

OBDII Code B2143 - Outside Rearview Mirror Reached Limit Of Travel - AutoCodes.com — B2143 Code - Outside Rearview Mirror Reached Limit Of Travel

What does this mean?

What are the Possible Causes of the DTC B2143?

Faulty Outside Rearview Mirror Switch
Outside Rearview Mirror Switch harness is open or shorted
Outside Rearview Mirror Switch circuit poor electrical connection
Faulty Memory Mirror Module (MMM)

How to Fix the DTC B2143?

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 B2143 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 B2143 code?

Need more information on how to fix the B2143 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2143 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2143 Buick — Outside Rearview Mirror Reached Limit Of Travel
B2143 Cadillac — Outside Rearview Mirror Reached Limit Of Travel
B2143 Chevrolet — Outside Rearview Mirror Reached Limit Of Travel
B2143 GMC — Outside Rearview Mirror Reached Limit Of Travel

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 B2143 Code

1. What are the common symptoms of OBDII code B2143, "Outside Rearview Mirror Reached Limit Of Travel"?

- The common symptoms include the outside rearview mirror not adjusting properly or reaching its physical limit of movement.

2. What can cause the OBDII code B2143 to trigger?

- The code B2143 can be triggered by a faulty mirror adjustment motor, damaged mirror housing, or issues with the mirror control switch.

3. How can I diagnose the OBDII code B2143 related to the outside rearview mirror?

- Diagnosis involves checking the mirror adjustment motor, inspecting the mirror housing for damage, and testing the mirror control switch for functionality.

4. Can I still drive my vehicle with the OBDII code B2143 present?

- While the code may not affect the drivability of the vehicle, it is recommended to address the issue promptly to ensure proper operation of the outside rearview mirror.

5. What is the typical repair for OBDII code B2143 indicating the mirror reached its limit of travel?

- The repair may involve replacing the mirror adjustment motor, repairing or replacing the mirror housing, or addressing any issues with the mirror control switch.

6. Are there any DIY tips for addressing OBDII code B2143 at home?

- DIY tips may include checking for any visible damage to the mirror housing, ensuring proper electrical connections to the mirror adjustment motor, and testing the mirror control switch.

7. Can weather conditions or external factors trigger the OBDII code B2143?

- Extreme weather conditions or physical impact to the outside rearview mirror can potentially trigger the code B2143 by affecting the mirror's movement.

8. How important is it to fix the OBDII code B2143 promptly?

- It is advisable to address the code promptly to ensure proper functionality of the outside rearview mirror, which is crucial for safe driving and visibility.

9. Is resetting the OBDII code B2143 enough, or should I seek professional repair?

- Resetting the code may clear the warning temporarily, but for a long-term solution, it is recommended to have a professional diagnose and repair the underlying issue.

10. Can the OBDII code B2143 impact other vehicle systems or safety features?

- While the code specifically relates to the outside rearview mirror, it is essential to address it to prevent potential safety concerns related to compromised visibility while driving.