AutoCodes – Buick – U1816 Buick

U1816 Buick 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 Buick 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.

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Code Popularity 397

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

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 Buick?

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 Buick 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.

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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 U1816 Buick Code

1. What are the common symptoms of OBDII code U1816 Buick?

- Common symptoms include the check engine light illuminating, poor vehicle performance, and potential difficulty shifting gears.

2. What does the OBDII code U1816 Buick mean?

- The code U1816 indicates a communication problem between the vehicle's onboard computer and the Drive Motor Control Module B on Bus B.

3. What are possible causes of the U1816 Buick code?

- Possible causes include a faulty Drive Motor Control Module B, wiring issues, loose connections, or a problem with the vehicle's network communication system.

4. How can I diagnose the U1816 Buick code?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific details of the error and checking the connections and wiring related to the Drive Motor Control Module B.

5. Can I still drive my vehicle with the U1816 code?

- It is not recommended to drive the vehicle with the U1816 code present, as it can lead to further damage or safety issues due to potential control module communication problems.

6. How can I repair the U1816 Buick code?

- Repairing the U1816 code may involve fixing any wiring or connection issues, replacing the Drive Motor Control Module B if necessary, and clearing the code with a diagnostic tool.

7. Is it safe to clear the U1816 code and continue driving?

- Clearing the code may temporarily reset the check engine light, but it is crucial to address the underlying issue causing the communication problem to prevent further complications.

8. Can a DIY enthusiast fix the U1816 code issue?

- While some basic checks like inspecting connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to the U1816 code may require professional assistance.

9. How much does it cost to repair the U1816 Buick code?

- The cost of repairing the U1816 code can vary depending on the underlying issue, parts needed, and labor costs. It is recommended to get a diagnosis from a mechanic for an accurate estimate.

10. How can I prevent the U1816 code from recurring in the future?

- Regular vehicle maintenance, checking for loose connections, and addressing any warning signs promptly can help prevent the U1816 code from recurring in the future.