AutoCodes – Buick – U1900 Buick

U1900 Buick Code - Lost Communication With Speech To Text Interface Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Speech To Text Interface Module, Speech To Text Interface Module harness is open or shorted, Speech To Text Interface 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: U1900 Buick indicates Lost Communication With Speech To Text Interface Module.
Common causes: Common causes include Faulty Speech To Text Interface Module, Speech To Text Interface Module harness is open or shorted, Speech To Text Interface 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.

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Code Popularity 763

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
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Code U1900 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 U1900 Buick - Lost Communication With Speech To Text Interface Module - AutoCodes.com — U1900 Buick Code - Lost Communication With Speech To Text Interface Module

What does this mean?

What are the Possible Causes of the DTC U1900 Buick?

Faulty Speech To Text Interface Module
Speech To Text Interface Module harness is open or shorted
Speech To Text Interface Module circuit poor electrical connection

How to Fix the DTC U1900 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 U1900 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 U1900 Buick Code

1. What does the OBDII code U1900 mean on a Buick?

U1900 indicates a communication error on the Controller Area Network (CAN) bus, specifically involving the Speech-To-Text Interface Module.

2. What are common symptoms of the U1900 code on a Buick?

Symptoms may include malfunctioning voice recognition features, unresponsive infotainment systems, or error messages on the dashboard.

3. What causes the U1900 code to appear on a Buick?

The code is often caused by a faulty Speech-To-Text Interface Module, damaged CAN bus wiring, poor electrical connections, or a software issue.

4. Can I drive my Buick with the U1900 code present?

Yes, but some features like voice commands or infotainment functions may not work properly. Itâ€™s best to address the issue to avoid further complications.

5. How do I diagnose the U1900 code on my Buick?

Use an advanced OBDII scanner capable of reading manufacturer-specific codes to check for communication faults. Inspect wiring, connectors, and the Speech-To-Text Interface Module for damage.

6. Can a blown fuse cause the U1900 code on a Buick?

Yes, a blown fuse related to the infotainment or communication system can disrupt the CAN bus and trigger the U1900 code.

7. How do I fix the U1900 code on a Buick?

Repairs may include checking and repairing wiring or connectors, replacing the Speech-To-Text Interface Module, or updating the vehicle's software.

8. Is the U1900 code specific to Buicks with advanced technology?

Yes, this code typically appears in models equipped with voice recognition and speech-to-text functionality.

9. Can a weak battery cause the U1900 code on a Buick?

Yes, a weak or failing battery can lead to communication errors on the CAN bus, including the U1900 code.

10. Do I need a dealership to fix the U1900 code on my Buick?

Not necessarily. A qualified technician with the right diagnostic tools can diagnose and repair the issue, but a dealership may have specific software updates if needed.