AutoCodes – Generic – B143E

B143E Code - Microphone 2 Circuit Low

Quick Answer

The diagnostic trouble code B143E indicates a problem with the Microphone 2 circuit, which is primarily monitored by the Hands Free Module. Common causes include Faulty Inside Rear View Mirror, Inside Rear View Mirror harness is open or shorted, Inside Rear View Mirror 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: B143E indicates Microphone 2 Circuit Low.
Common causes: Common causes include Faulty Inside Rear View Mirror, Inside Rear View Mirror harness is open or shorted, Inside Rear View Mirror 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 43

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Nov 05, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B143E Description

The diagnostic trouble code B143E indicates a problem with the Microphone 2 circuit, which is primarily monitored by the Hands Free Module. This code is triggered when the Hands Free Module detects that the microphone is not functioning within the specified parameters set by the manufacturer. In many vehicles, particularly those equipped with advanced infotainment systems, the microphone is integrated into the Inside Rear View Mirror. This integration allows for hands-free communication, voice commands, and other functionalities that enhance driver safety and convenience. When the microphone circuit is low, it can lead to poor audio quality during calls, difficulty in voice recognition, and may even disable certain features of the vehicle's infotainment system. Ignoring this code can lead to long-term issues, such as complete failure of the hands-free system, which can be particularly problematic for drivers who rely on voice commands for navigation and communication. Additionally, a malfunctioning microphone can affect other systems that depend on audio input, potentially leading to further diagnostics and repairs down the line. Overall, addressing the B143E code promptly ensures that the vehicle's communication systems function optimally, maintaining both safety and convenience for the driver and passengers.

OBDII Code B143E - Microphone 2 Circuit Low - AutoCodes.com — B143E Code - Microphone 2 Circuit Low

What does this mean?

What are the Possible Causes of the DTC B143E?

Faulty Inside Rear View Mirror
Inside Rear View Mirror harness is open or shorted
Inside Rear View Mirror circuit poor electrical connection
Faulty Hands Free Module

How to Fix the DTC B143E?

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 B143E 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 B143E code?

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Information for Specific Makes

B143E Chrysler — Microphone 2 Circuit Low
B143E Dodge — Microphone 2 Circuit Low
B143E Jeep — Microphone 2 Circuit Low
B143E RAM — Microphone 2 Circuit Low

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.