AutoCodes – GMC – U1836 2017 GMC Sierra

U1836 2017 GMC Sierra Code - Lost Communication with Amplifier on Low Speed CAN Bus

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Amplifier, Amplifier harness is open or shorted, Amplifier 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: U1836 2017 GMC Sierra indicates Lost Communication with Amplifier on Low Speed CAN Bus.
Common causes: Common causes include Faulty Amplifier, Amplifier harness is open or shorted, Amplifier 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 213

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 Jul 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1836 2017 GMC Sierra Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Codes (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of health message, detect its absence; those devices in turn set a DTC associated with the loss of state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC.

OBDII Code U1836 2017 GMC Sierra - Lost Communication with Amplifier on Low Speed CAN Bus - AutoCodes.com — U1836 2017 GMC Sierra Code - Lost Communication with Amplifier on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U1836 2017 GMC Sierra?

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

How to Fix the DTC U1836 2017 GMC Sierra?

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 U1836 2017 GMC Sierra 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 U1836 2017 GMC Sierra code?

Need more information on how to fix the U1836 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1836 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 U1836 2017 GMC Sierra Code

1. What does the OBDII code U1836 mean on a 2017 GMC Sierra?

The U1836 code indicates a loss of communication with the amplifier on the low-speed CAN (Controller Area Network) bus.

2. What are the common symptoms of the U1836 code in a 2017 GMC Sierra?

Symptoms may include no audio output from the speakers, intermittent sound issues, or a "no communication" message from the amplifier.

3. What causes the U1836 code to appear?

Common causes include a faulty amplifier, damaged wiring or connectors in the low-speed CAN bus, or issues with the vehicle's communication system.

4. Can the U1836 code affect other vehicle systems?

Yes, since it pertains to the vehicle's communication network, it may impact other modules that rely on the low-speed CAN bus.

5. How is the U1836 code diagnosed?

A technician will use a scan tool to check for related codes, inspect the amplifier, and test the CAN bus wiring and connectors for faults.

6. Can I drive my 2017 GMC Sierra with the U1836 code?

Yes, but you may experience audio issues, and ignoring the code could lead to further communication problems if left unresolved.

7. What is the most common fix for the U1836 code?

The most common fix is repairing or replacing a faulty amplifier or addressing damaged wiring or connectors in the CAN bus.

8. How can I prevent the U1836 code from recurring?

Ensure all electrical connections to the amplifier are secure and free of corrosion, and avoid exposing the system to excessive moisture or vibration.

9. Will clearing the U1836 code fix the problem?

Clearing the code may temporarily remove it, but if the underlying issue isnâ€™t resolved, the code will likely return.

10. Is the U1836 code covered under warranty for a 2017 GMC Sierra?

It depends on the warranty terms and coverage. Communication system or amplifier issues may fall under specific warranty conditions, especially if the vehicle is within the warranty period.