AutoCodes – GMC – U1836 2015 GMC Sierra

U1836 2015 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 2015 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 218

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1836 2015 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 2015 GMC Sierra - Lost Communication with Amplifier on Low Speed CAN Bus - AutoCodes.com — U1836 2015 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 2015 GMC Sierra?

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

How to Fix the DTC U1836 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the U1836 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1836 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code U1836 in a 2015 GMC Sierra related to "Lost Communication with Amplifier on Low Speed CAN Bus"?

- Common symptoms include loss of sound from the audio system, malfunctioning radio controls, and erratic behavior of the amplifier.

2. What are some possible causes of OBDII code U1836 in a 2015 GMC Sierra?

- Possible causes include damaged wiring or connectors in the CAN bus communication system, a faulty amplifier module, or a communication issue between modules.

3. How can I diagnose the issue causing OBDII code U1836 in my 2015 GMC Sierra?

- Diagnose the issue by checking the wiring and connectors for damage, testing the amplifier module for proper function, and using a diagnostic scanner to read the trouble codes and pinpoint the problem.

4. Can I still drive my 2015 GMC Sierra with OBDII code U1836 present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent further damage to the audio system components.

5. How can I repair OBDII code U1836 in my 2015 GMC Sierra?

- Repair options include repairing or replacing damaged wiring and connectors, replacing the faulty amplifier module, and reprogramming or updating the vehicle's software as needed.

6. Are there any DIY tips for fixing OBDII code U1836 in a 2015 GMC Sierra?

- DIY tips include checking for loose connections, ensuring proper grounding of components, and following a service manual or wiring diagram for troubleshooting steps.

7. Can a software update fix OBDII code U1836 in my 2015 GMC Sierra?

- In some cases, a software update provided by the manufacturer may resolve communication issues causing this trouble code.

8. How much does it typically cost to repair OBDII code U1836 in a 2015 GMC Sierra at a dealership or repair shop?

- Costs can vary depending on the exact cause of the issue, but repairs for this code may range from $100 to $500 or more, including parts and labor.

9. Will resetting the trouble codes make OBDII code U1836 disappear permanently from my 2015 GMC Sierra?

- Resetting the trouble codes may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

10. Is OBDII code U1836 in a 2015 GMC Sierra a common problem?

- While not extremely common, issues related to "Lost Communication with Amplifier on Low Speed CAN Bus" can occur in certain vehicle models, including the 2015 GMC Sierra.