AutoCodes – Cadillac – U1900 Cadillac

U1900 Cadillac 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 Cadillac 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 729

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

What does this mean?

What are the Possible Causes of the DTC U1900 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U1900 in a Cadillac related to the Speech To Text Interface Module?

- Common symptoms include loss of speech recognition functionality, malfunctioning voice commands, and issues with hands-free calling features.

2. What are the possible causes of the U1900 code indicating lost communication with the Speech To Text Interface Module in a Cadillac?

- Causes may include a faulty Speech To Text Interface Module, damaged wiring or connectors, software glitches, or communication network issues.

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

- Diagnosis involves checking the wiring and connectors for any damage, testing the Speech To Text Interface Module, and using a diagnostic scanner to pinpoint communication faults.

4. Can a U1900 code related to the Speech To Text Interface Module be repaired without professional help?

- While basic checks like inspecting connectors can be done by DIY enthusiasts, resolving complex issues with the module or network may require professional diagnosis and repair.

5. Is it safe to continue driving with the U1900 trouble code in a Cadillac affecting the Speech To Text Interface Module?

- It is generally safe to drive, but you may experience a loss of hands-free communication features until the issue is resolved.

6. How much does it typically cost to repair a U1900 code linked to the Speech To Text Interface Module in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $100 for basic fixes to several hundred dollars for module replacement or network repairs.

7. Can resetting the OBDII system clear the U1900 code related to the Speech To Text Interface Module in a Cadillac?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear upon further use.

8. Are there any preventive maintenance tips to avoid encountering the U1900 trouble code in a Cadillac?

- Regularly checking the condition of wiring and connectors, updating software as recommended by the manufacturer, and avoiding water damage to electronic components can help prevent such issues.

9. Will a U1900 diagnostic trouble code affecting the Speech To Text Interface Module in a Cadillac cause other vehicle systems to malfunction?

- While the U1900 code primarily relates to the Speech To Text Interface Module, it can sometimes lead to communication issues affecting other vehicle modules, impacting overall functionality.

10. How long does it typically take to repair a U1900 trouble code in a Cadillac associated with the Speech To Text Interface Module?

- The repair time can vary based on the complexity of the issue. Simple fixes may take an hour or two, while more intricate problems might require a day or more for diagnosis and repair.