AutoCodes – Generic – B143F

B143F Code - Microphone 2 Circuit High

Quick Answer

The diagnostic code B143F indicates a problem with the Microphone 2 Circuit, specifically that the Hands Free Module has detected that the microphone is not functioning within factory specifications. 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: B143F indicates Microphone 2 Circuit High.
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 39

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 Nov 05, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code B143F Description

The diagnostic code B143F indicates a problem with the Microphone 2 Circuit, specifically that the Hands Free Module has detected that the microphone is not functioning within factory specifications. This code is often associated with vehicles equipped with hands-free communication systems, which rely on microphones to capture audio for phone calls, voice commands, and other interactive features. In many models, the microphone may be integrated into the Inside Rear View Mirror, making it a critical component for both safety and convenience. When the Hands Free Module identifies an issue, it can lead to a range of performance problems, including diminished audio quality during calls, failure to recognize voice commands, or complete inoperability of the hands-free system.

OBDII Code B143F - Microphone 2 Circuit High - AutoCodes.com — B143F Code - Microphone 2 Circuit High

What does this mean?

What are the Possible Causes of the DTC B143F?

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 B143F?

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 B143F 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 B143F code?

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Need Help with the Code?

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Information for Specific Makes

B143F Chrysler — Microphone 2 Circuit High
B143F Dodge — Microphone 2 Circuit High
B143F Jeep — Microphone 2 Circuit High
B143F RAM — Microphone 2 Circuit High

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.