AutoCodes – Generic – B2142

B2142 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: B2142 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 4,654

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 B2142 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 B2142 - Outside Rearview Mirror Reached Limit Of Travel - AutoCodes.com — B2142 Code - Outside Rearview Mirror Reached Limit Of Travel

What does this mean?

What are the Possible Causes of the DTC B2142?

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 B2142?

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 B2142 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 B2142 code?

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Need Help with the Code?

Get the B2142 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2142 Buick — Outside Rearview Mirror Reached Limit Of Travel
B2142 Cadillac — Outside Rearview Mirror Reached Limit Of Travel
B2142 Chevrolet — Outside Rearview Mirror Reached Limit Of Travel
B2142 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 B2142 Code

1. What are the common symptoms of OBDII code B2142?

The common symptoms of code B2142 include the outside rearview mirror reaching its mechanical limit of travel and being unable to adjust properly.

2. What are the possible causes of OBDII code B2142?

The code B2142 is typically caused by a faulty outside rearview mirror motor, damaged mirror assembly, or wiring issues related to the mirror adjustment system.

3. How can I diagnose OBDII code B2142 at home?

You can diagnose code B2142 by visually inspecting the exterior rearview mirror for any physical damage, testing the mirror adjustment controls, and checking the wiring connections for any signs of wear or corrosion.

4. Can I still drive my vehicle with OBDII code B2142?

It is generally safe to drive your vehicle with code B2142, but it is important to address the issue promptly to ensure proper functionality of the exterior rearview mirror.

5. Is it possible to repair OBDII code B2142 without professional help?

If you have experience working on automotive electrical systems, you may be able to repair code B2142 by replacing the faulty mirror motor, repairing damaged wiring, or adjusting the mirror assembly yourself.

6. What are the repair options for OBDII code B2142?

Repair options for code B2142 include replacing the outside rearview mirror motor, repairing or replacing damaged wiring, and adjusting the mirror assembly to ensure proper functionality.

7. How much does it typically cost to fix OBDII code B2142?

The cost of fixing code B2142 can vary depending on the extent of the damage and the specific repair needed. Replacing a mirror motor or repairing wiring may cost between $100 to $300, including parts and labor.

8. Can weather conditions affect the occurrence of OBDII code B2142?

Extreme weather conditions, such as exposure to high heat or moisture, can potentially damage the outside rearview mirror components and lead to the occurrence of code B2142.

9. Is it necessary to reset the OBDII system after repairing code B2142?

It is recommended to reset the OBDII system after repairing code B2142 to clear the fault code and ensure that the issue has been successfully resolved.

10. What should I do if OBDII code B2142 keeps coming back after repairs?

If code B2142 keeps coming back after repairs, it is advisable to recheck the mirror assembly, wiring connections, and motor for any overlooked issues or consider seeking professional assistance for a thorough diagnosis.