AutoCodes – Buick – U1901 Buick

U1901 Buick Code - Lost Communication With Infotainment Multifunction Switch Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Infotainment Multifunction Switch Module, Infotainment Multifunction Switch Module harness is open or shorted, Infotainment Multifunction Switch 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: U1901 Buick indicates Lost Communication With Infotainment Multifunction Switch Module.
Common causes: Common causes include Faulty Infotainment Multifunction Switch Module, Infotainment Multifunction Switch Module harness is open or shorted, Infotainment Multifunction Switch 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 549

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 09, 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 U1901 Buick Description

Devices connected to the 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 a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U1901 Buick - Lost Communication With Infotainment Multifunction Switch Module - AutoCodes.com — U1901 Buick Code - Lost Communication With Infotainment Multifunction Switch Module

What does this mean?

What are the Possible Causes of the DTC U1901 Buick?

Faulty Infotainment Multifunction Switch Module
Infotainment Multifunction Switch Module harness is open or shorted
Infotainment Multifunction Switch Module circuit poor electrical connection

How to Fix the DTC U1901 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 U1901 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 U1901 Buick code?

Need more information on how to fix the U1901 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1901 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 U1901 Buick Code

1. What does the OBDII code U1901 mean on a Buick?

U1901 indicates a loss of communication with the Infotainment Multifunction Switch Module, typically related to the vehicleâ€™s communication network.

2. What are common symptoms of code U1901 in a Buick?

Symptoms may include a malfunctioning infotainment system, unresponsive steering wheel controls, or warning lights on the dashboard.

3. What causes the U1901 code on a Buick?

Common causes include a faulty Infotainment Multifunction Switch Module, wiring issues, loose or corroded connectors, or problems with the vehicleâ€™s communication network.

4. Can a dead battery cause the U1901 code to appear?

Yes, a weak or dead battery can disrupt the communication network, potentially triggering the U1901 code.

5. How can I troubleshoot the U1901 code in a Buick?

Start by inspecting the wiring and connectors to the module for damage or corrosion. Check for proper voltage and ground at the module and scan for other related codes.

6. Can I drive my Buick with the U1901 code active?

While the car may still be drivable, communication issues can affect infotainment and other related systems, potentially leading to distractions or reduced functionality.

7. How do I fix the U1901 code on my Buick?

Fixes may include repairing or replacing damaged wiring, cleaning corroded connectors, updating module software, or replacing the Infotainment Multifunction Switch Module if faulty.

8. Will clearing the U1901 code solve the problem?

Simply clearing the code may not resolve the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.

9. Can a software update resolve the U1901 code?

In some cases, a software update for the Infotainment Multifunction Switch Module or related systems can fix communication issues.

10. Should I take my Buick to a mechanic for the U1901 code?

If basic troubleshooting doesnâ€™t resolve the issue or if you lack diagnostic tools, itâ€™s best to consult a certified mechanic for proper diagnosis and repair.