AutoCodes – Chevrolet – U0186 Chevrolet

U0186 Chevrolet Code - Lost Communication With Speaker Amplifier Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Speaker Amplifier Module, Speaker Amplifier Module harness is open or shorted, Speaker Amplifier Module 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: U0186 Chevrolet indicates Lost Communication With Speaker Amplifier Module.
Common causes: Common causes include Faulty Speaker Amplifier Module, Speaker Amplifier Module harness is open or shorted, Speaker Amplifier Module 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 4,084

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 Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0186 Chevrolet Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Speaker Amplifier Module has not been received.

OBDII Code U0186 Chevrolet - Lost Communication With Speaker Amplifier Module - AutoCodes.com — U0186 Chevrolet Code - Lost Communication With Speaker Amplifier Module

What does this mean?

What are the Possible Causes of the DTC U0186 Chevrolet?

Faulty Speaker Amplifier Module
Speaker Amplifier Module harness is open or shorted
Speaker Amplifier Module circuit poor electrical connection

How to Fix the DTC U0186 Chevrolet?

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 U0186 Chevrolet 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 U0186 Chevrolet code?

Need more information on how to fix the U0186 Chevrolet code? Get Access to Factory Service Manuals

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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 U0186 Chevrolet Code

1. What does OBDII code U0186 mean on a Chevrolet?

Code U0186 indicates the vehicleâ€™s communication system has lost contact with the Speaker Amplifier Module.

2. What are the common symptoms of code U0186 in a Chevrolet?

Symptoms may include no sound from the speakers, malfunctioning audio controls, or intermittent audio system operation.

3. What causes the U0186 code to appear on a Chevrolet?

The most common causes include a faulty Speaker Amplifier Module, damaged or corroded wiring, poor electrical connections, or a malfunctioning communication bus.

4. Can a blown fuse cause the U0186 code on a Chevrolet?

Yes, a blown fuse related to the audio system or communication circuit can trigger the U0186 code.

5. How is the U0186 code diagnosed in a Chevrolet?

A mechanic will typically inspect the wiring and connectors for damage, verify power and ground to the amplifier module, and use a scan tool to check for communication on the data bus.

6. Can I still drive my Chevrolet with a U0186 code?

Yes, the vehicle is usually drivable, but the audio system may not function properly, which could reduce convenience and entertainment.

7. How do I fix the U0186 code on my Chevrolet?

Repairs may include replacing or repairing damaged wiring, cleaning corroded connectors, or replacing the faulty Speaker Amplifier Module.

8. Is the U0186 code specific to Chevrolet, or does it apply to other brands?

The U0186 code is not Chevrolet-specific and can apply to other makes and models with similar communication issues.

9. Can a software update fix the U0186 code in a Chevrolet?

In some cases, a software update to the vehicle's control modules may resolve communication issues and clear the U0186 code.

10. What tools are needed to troubleshoot the U0186 code on a Chevrolet?

Youâ€™ll typically need a scan tool capable of reading manufacturer-specific codes, a multimeter for testing electrical circuits, and wiring diagrams for the audio system.