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U1901 Buick Code - Lost Communication With Infotainment Multifunction Switch Module

Quick Answer

The U1901 Buick code indicates that there is a communication problem between the vehicle's control module and the Infotainment Multifunction Switch Module. Common causes include Faulty wiring or connections related to the Infotainment Multifunction Switch Module, Defective Infotainment Multifunction Switch Module, Software glitches or malfunctions in the control module. 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 wiring or connections related to the Infotainment Multifunction Switch Module, Defective Infotainment Multifunction Switch Module, Software glitches or malfunctions in the control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U1901 Buick Description

The U1901 Buick code indicates that there is a communication problem between the vehicle's control module and the Infotainment Multifunction Switch Module. This module is responsible for controlling various functions related to the infotainment system, such as audio controls, Bluetooth connectivity, and possibly other features like cruise control or steering wheel controls. When communication is lost with this module, it can lead to a variety of issues with the vehicle's infotainment system and potentially affect other systems as well.

OBDII Code U1901 Buick - Lost Communication With Infotainment Multifunction Switch Module
U1901 Buick Code - Lost Communication With Infotainment Multifunction Switch Module

Common Causes of U1901 Buick

  1. Faulty wiring or connections related to the Infotainment Multifunction Switch Module
  2. Defective Infotainment Multifunction Switch Module
  3. Software glitches or malfunctions in the control module
  4. Water damage or corrosion affecting the module
  5. Electrical interference or signal disruption

Symptoms of U1901 Buick

  1. Loss of control over the audio system
  2. Inability to use steering wheel controls for various functions
  3. Malfunctioning Bluetooth connectivity
  4. Possible issues with cruise control functionality
  5. Illumination of the check engine light

How to Fix U1901 Buick

  1. Begin by conducting a thorough diagnostic scan to confirm the U1901 code and identify the specific cause of the communication loss.
  2. Inspect the wiring and connections related to the Infotainment Multifunction Switch Module for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the Infotainment Multifunction Switch Module for functionality and replace if found to be defective.
  4. Check for any software updates or reprogramming that may be required to resolve communication issues between modules.
  5. Clear the diagnostic trouble codes, reset the vehicle's systems, and perform a final test to ensure proper communication and functionality.

Cost to Fix U1901 Buick

The typical repair costs for addressing a U1901 Buick code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of parts for this repair could range from $200 to $500, with labor costs adding an additional $100 to $200. However, it's important to note that these are rough estimates and actual costs may vary based on factors such as the vehicle's make and model, the location of the repair shop, and the expertise of the technician. It's recommended to obtain quotes from multiple repair shops to compare prices and ensure a fair deal.

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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 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 vehicle’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 vehicle’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 doesn’t resolve the issue or if you lack diagnostic tools, it’s best to consult a certified mechanic for proper diagnosis and repair.

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