AutoCodes – Cadillac – B2142 Cadillac

B2142 Cadillac 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 Cadillac 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 513

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

What does this mean?

What are the Possible Causes of the DTC B2142 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code B2142 mean on a Cadillac?

B2142 indicates that the outside rearview mirror has reached its limit of travel, meaning the mirror motor cannot move the mirror any further in one or more directions.

2. What are the common symptoms of code B2142 on a Cadillac?

Symptoms include the mirror not responding to adjustment commands, limited mirror movement, or a clicking noise when trying to adjust the mirror.

3. What causes the B2142 code on a Cadillac?

Common causes include a malfunctioning mirror motor, a stuck or misaligned mirror, debris obstructing movement, or a fault in the mirror control module.

4. Can I still drive my Cadillac if the B2142 code is present?

Yes, you can still drive the vehicle, but the outside rearview mirror may not adjust properly, potentially impacting visibility and safety.

5. How do I diagnose the B2142 code on a Cadillac?

Diagnosis involves checking for physical obstructions, inspecting the mirror motor for faults, and testing the mirror control module for proper functionality using diagnostic tools.

6. How can I fix the B2142 code on my Cadillac?

Repairs may include cleaning or removing obstructions, realigning the mirror, replacing the mirror motor, or addressing wiring or module issues.

7. Is the B2142 code specific to Cadillac vehicles?

While B2142 may appear on other vehicles, the exact meaning and repair steps can vary depending on the manufacturer. On a Cadillac, it specifically refers to the outside rearview mirror travel limit.

8. How much does it cost to fix the B2142 code on a Cadillac?

The cost varies depending on the issue. Replacing a mirror motor may cost between $150 and $300, while control module repairs could be more expensive.

9. Can I clear the B2142 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return if the underlying issue is not resolved.

10. How can I prevent the B2142 code from recurring on my Cadillac?

To prevent recurrence, ensure the mirror is not physically obstructed, avoid forcing the mirror during manual adjustment, and keep the mirror area clean and free of debris.