AutoCodes – Chevrolet – U1816 Chevrolet

U1816 Chevrolet Code - Lost Communication With Drive Motor Control Module B On Bus B

Quick Answer

Devices connected to the powertrain high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Drive Motor Control Module B, Drive Motor Control Module B harness is open or shorted, Drive Motor Control Module B 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: U1816 Chevrolet indicates Lost Communication With Drive Motor Control Module B On Bus B.
Common causes: Common causes include Faulty Drive Motor Control Module B, Drive Motor Control Module B harness is open or shorted, Drive Motor Control Module B 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 455

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 Jun 07, 2020

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 U1816 Chevrolet Description

Devices connected to the powertrain 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 devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1816 Chevrolet - Lost Communication With Drive Motor Control Module B On Bus B - AutoCodes.com — U1816 Chevrolet Code - Lost Communication With Drive Motor Control Module B On Bus B

What does this mean?

What are the Possible Causes of the DTC U1816 Chevrolet?

Faulty Drive Motor Control Module B
Drive Motor Control Module B harness is open or shorted
Drive Motor Control Module B circuit poor electrical connection

How to Fix the DTC U1816 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 U1816 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 U1816 Chevrolet code?

Need more information on how to fix the U1816 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1816 Chevrolet 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 U1816 Chevrolet Code

1. What are the common symptoms of OBDII code U1816 in a Chevrolet vehicle?

- Common symptoms include loss of communication with the drive motor control module, issues with the electric drive system, and possible illumination of the check engine light.

2. What are the possible causes of the U1816 code in a Chevrolet?

- The code U1816 typically indicates a communication problem between modules, which can be caused by wiring issues, a faulty drive motor control module, or a problem with the vehicle's network communication system.

3. How can I diagnose the U1816 code in my Chevrolet?

- Diagnosing the U1816 code usually involves using a professional OBDII scanner to retrieve the trouble codes, checking the wiring and connectors related to the drive motor control module, and testing the module itself for proper functionality.

4. Can I drive my Chevrolet with the U1816 code present?

- It is not recommended to drive your vehicle with the U1816 code present, as it can lead to performance issues with the electric drive system and may cause further damage if left unresolved.

5. How can I repair the U1816 code in my Chevrolet?

- Repairing the U1816 code often involves inspecting and repairing any damaged wiring or connectors, replacing the drive motor control module if necessary, and clearing the trouble codes with a diagnostic tool.

6. Are there any DIY tips for fixing the U1816 code in a Chevrolet?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done DIY, resolving the U1816 code usually requires professional diagnostic equipment and expertise.

7. Will the U1816 code affect the overall performance of my Chevrolet?

- Yes, the U1816 code can affect the overall performance of your Chevrolet, particularly the functionality of the electric drive system and communication between various modules in the vehicle.

8. How much does it cost to repair the U1816 code in a Chevrolet?

- The cost of repairing the U1816 code can vary depending on the specific cause of the issue, but it may involve costs for parts replacement, labor, and diagnostic services.

9. Is the U1816 code a common issue in Chevrolet vehicles?

- The U1816 code related to lost communication with the drive motor control module is not extremely common, but it can occur in Chevrolet vehicles equipped with electric drive systems.

10. Can a faulty drive motor control module cause the U1816 code in a Chevrolet?

- Yes, a faulty drive motor control module is one of the potential causes of the U1816 code in a Chevrolet, as it can disrupt communication on the bus network and trigger the code.