AutoCodes – GMC – U1900 GMC

U1900 GMC 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 GMC 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 1,163

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

What does this mean?

What are the Possible Causes of the DTC U1900 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code U1900 in a GMC vehicle?

- Common symptoms include issues with speech recognition features, malfunctioning voice commands, and the inability to use hands-free calling or voice control functions.

2. What causes the U1900 code indicating lost communication with the Speech To Text Interface Module in a GMC?

- The U1900 code is typically triggered by a faulty Speech To Text Interface Module, wiring issues, loose connections, or a communication breakdown between the module and other vehicle systems.

3. How can I diagnose the U1900 trouble code related to the Speech To Text Interface Module in my GMC?

- To diagnose the U1900 code, you can use an OBDII scanner to retrieve the code, check for any additional related codes, inspect the wiring and connections to the module, and conduct a thorough system test.

4. What are some repair tips for resolving the U1900 code in a GMC due to lost communication with the Speech To Text Interface Module?

- Repair tips include checking and securing all connections to the module, inspecting and repairing any damaged wiring, replacing the Speech To Text Interface Module if necessary, and clearing the trouble codes after repairs are completed.

5. Can I drive my GMC with the U1900 code indicating lost communication with the Speech To Text Interface Module?

- While it may be possible to drive the vehicle with the U1900 code, it is advisable to address the issue promptly to prevent further communication malfunctions and potential safety risks associated with impaired voice control features.

6. Is the U1900 code related to the Speech To Text Interface Module a common issue in GMC vehicles?

- The U1900 code related to lost communication with the Speech To Text Interface Module is not as common as some other OBDII codes, but it can still occur in GMC vehicles equipped with this specific module.

7. Do I need specialized tools to repair the U1900 trouble code in my GMC related to the Speech To Text Interface Module?

- While specialized tools may not be required, having an OBDII scanner, basic hand tools for inspecting connections, and possibly a multimeter for testing electrical components can be helpful in diagnosing and repairing the U1900 code.

8. Can a DIY enthusiast fix the U1900 trouble code indicating lost communication with the Speech To Text Interface Module in a GMC?

- Depending on the DIY enthusiast's skill level and access to resources, it may be possible to diagnose and repair the U1900 code. However, if unsure, it is recommended to seek professional assistance to ensure proper resolution.

9. What are the potential risks of ignoring the U1900 trouble code related to the Speech To Text Interface Module in my GMC?

- Ignoring the U1900 code can lead to continued issues with voice control functions, potential strain on other vehicle systems, and the risk of losing important communication features while driving.

10. Are there any software updates or recalls related to the U1900 code in GMC vehicles with Speech To Text Interface Modules?

- It is advisable to check with GMC dealerships or official sources for any software updates or recalls related to the U1900 code and the Speech To Text Interface Module in your specific vehicle model.