AutoCodes – Chevrolet – U1900 Chevrolet

U1900 Chevrolet 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 Chevrolet 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 1,309

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

What does this mean?

What are the Possible Causes of the DTC U1900 Chevrolet?

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 Chevrolet?

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 Chevrolet 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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Need more information on how to fix the U1900 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1900 Chevrolet 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 U1900 Chevrolet Code

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

U1900 indicates a loss of communication with the Speech to Text Interface Module on the vehicle's data network.

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

Symptoms may include the speech-to-text feature not working, warning lights on the dashboard, and possible issues with other communication-dependent systems.

3. What causes the U1900 code to appear?

Common causes include a faulty Speech to Text Interface Module, damaged wiring or connectors, or a failure in the CAN (Controller Area Network) bus communication system.

4. Can a weak battery cause the U1900 code on a Chevrolet?

Yes, a weak or failing battery can disrupt communication on the CAN network, potentially triggering the U1900 code.

5. How can I diagnose the U1900 code on my Chevrolet?

Start by inspecting the wiring and connectors for damage, test the battery voltage, and use a scan tool to check for additional communication-related codes.

6. Is it safe to drive with the U1900 code on a Chevrolet?

While the vehicle may still drive, unresolved communication issues can affect system performance or lead to unexpected malfunctions.

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

Repairs may include replacing the Speech to Text Interface Module, repairing damaged wiring, or addressing CAN bus communication faults.

8. Can a software update fix the U1900 code on a Chevrolet?

In some cases, a software update for the vehicle's modules may resolve the issue, especially if the problem is related to outdated or corrupted software.

9. How much does it cost to repair the U1900 code on a Chevrolet?

The cost varies depending on the issue, ranging from low-cost wiring repairs to more expensive module replacements, which can cost $200-$600 or more.

10. Can a loose connector cause the U1900 code on a Chevrolet?

Yes, a loose or corroded connector in the communication system can disrupt signals and trigger the U1900 code.

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