AutoCodes – GMC – B2142 GMC

B2142 GMC 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 GMC 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 562

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

What does this mean?

What are the Possible Causes of the DTC B2142 GMC?

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 GMC?

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 GMC 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.

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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 GMC Code

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

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

2. What causes OBDII code B2142 GMC to be triggered?

Code B2142 GMC is triggered when the control module detects that the outside rearview mirror has reached its limit of travel during the calibration process.

3. How can I diagnose the cause of OBDII code B2142 GMC?

Diagnosing code B2142 GMC involves checking the wiring and connections to the outside rearview mirror, ensuring there are no obstructions hindering its movement, and verifying the mirror's motor functionality.

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

While it is generally safe to drive with this code, it is recommended to address the issue promptly to ensure proper functionality of the outside rearview mirror.

5. How can I repair OBDII code B2142 GMC?

Repairing code B2142 GMC may involve resetting the mirror calibration, checking and repairing any damaged wiring or connections, and ensuring the mirror can move freely without obstructions.

6. Are there any DIY tips for fixing OBDII code B2142 GMC?

Some DIY tips for addressing code B2142 GMC include checking the mirror adjustment settings in the vehicle's settings menu and manually adjusting the mirror to see if it responds.

7. Will resetting the vehicle's computer clear OBDII code B2142 GMC?

Resetting the vehicle's computer may temporarily clear the code, but if the underlying issue with the outside rearview mirror's travel limit is not addressed, the code is likely to return.

8. Can extreme weather conditions affect OBDII code B2142 GMC?

Extreme weather conditions, such as extreme cold or heat, can potentially affect the movement of the outside rearview mirror and trigger code B2142 GMC.

9. Is OBDII code B2142 GMC a common issue in GMC vehicles?

Code B2142 GMC related to the outside rearview mirror reaching its limit of travel is a relatively common issue in GMC vehicles equipped with advanced mirror adjustment features.

10. How long does it take to repair OBDII code B2142 GMC?

The time it takes to repair code B2142 GMC can vary depending on the underlying cause, but it typically does not require extensive labor and can often be resolved relatively quickly by addressing the mirror's calibration and functionality.