AutoCodes – Buick – U0146 Buick

U0146 Buick Code - Lost Communication With Serial Data Gateway 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 Serial Data Gateway Module, Serial Data Gateway Module harness is open or shorted, Serial Data Gateway 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: U0146 Buick indicates Lost Communication With Serial Data Gateway Module.
Common causes: Common causes include Faulty Serial Data Gateway Module, Serial Data Gateway Module harness is open or shorted, Serial Data Gateway 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.

Save to My Repairs My Repairs

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

Code Popularity 1,094

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 01, 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 U0146 Buick 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 Serial Data Gateway Module has not been received.

Pictures shown may vary from actual

OBDII Code U0146 Buick - Lost Communication With Serial Data Gateway Module - AutoCodes.com — U0146 Buick Code - Lost Communication With Serial Data Gateway Module

What does this mean?

What are the Possible Causes of the DTC U0146 Buick?

Faulty Serial Data Gateway Module
Serial Data Gateway Module harness is open or shorted
Serial Data Gateway Module circuit poor electrical connection

How to Fix the DTC U0146 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 U0146 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.

Need more information about the U0146 Buick code?

Need more information on how to fix the U0146 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0146 Buick 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 U0146 Buick Code

1. What are the common symptoms of OBDII code U0146 in a Buick related to lost communication with the serial data gateway module?

- Common symptoms include issues with various electronic systems, such as the radio, navigation, and climate control, as well as potential communication problems with the engine control module.

2. What are some possible causes of OBDII code U0146 in a Buick?

- Possible causes can include a faulty serial data gateway module, damaged wiring or connectors, software issues, or a malfunctioning control module.

3. How can I diagnose the source of the problem for OBDII code U0146 in my Buick?

- Diagnosing the issue typically involves using a professional OBDII scanner to retrieve the specific fault codes and conducting a thorough inspection of the serial data gateway module, wiring, and connectors.

4. Can I continue driving my Buick with OBDII code U0146 present?

- It is not recommended to continue driving your vehicle with this code present, as it can lead to potential safety hazards and further damage to electronic components.

5. How can I repair OBDII code U0146 in my Buick?

- Repairing this code often involves addressing the root cause of the communication issue, which may require replacing the serial data gateway module, repairing damaged wiring, or reprogramming control modules.

6. Is it possible to reset OBDII code U0146 in a Buick without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of your vehicle's systems.

7. Are there any preventative measures I can take to avoid encountering OBDII code U0146 in my Buick?

- Regular maintenance checks and inspections of your vehicle's electrical components, including wiring and connectors, can help prevent issues that may lead to the U0146 code.

8. Can extreme weather conditions contribute to triggering OBDII code U0146 in a Buick?

- Yes, extreme weather conditions such as temperature fluctuations or moisture can potentially affect the electrical connections and components, leading to communication errors and triggering the U0146 code.

9. How long does it typically take to repair OBDII code U0146 in a Buick?

- The repair time can vary depending on the specific cause of the issue, but it may take anywhere from a few hours to a day to diagnose and address the problem effectively.

10. Is it necessary to visit a dealership or can an independent mechanic handle the repair for OBDII code U0146 in a Buick?

- An independent mechanic with experience in handling electronic system issues can typically diagnose and repair OBDII code U0146 in a Buick, but dealership service centers may also provide specialized expertise and support for this type of problem.