AutoCodes – Buick – U0191 Buick

U0191 Buick Code - Lost Communication With Television

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Television, Television harness is open or shorted, Television 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: U0191 Buick indicates Lost Communication With Television.
Common causes: Common causes include Faulty Television, Television harness is open or shorted, Television 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 512

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 Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0191 Buick Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules 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 module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Television has not been received.

OBDII Code U0191 Buick - Lost Communication With Television - AutoCodes.com — U0191 Buick Code - Lost Communication With Television

What does this mean?

What are the Possible Causes of the DTC U0191 Buick?

Faulty Television
Television harness is open or shorted
Television circuit poor electrical connection

How to Fix the DTC U0191 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 U0191 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 U0191 Buick Code

1. What does the OBDII code U0191 mean on a Buick?

U0191 indicates a loss of communication with the Telematics Control Module (TCM), which manages systems like OnStar or emergency communication features.

2. What are the common symptoms of code U0191 in a Buick?

Symptoms include non-functional OnStar services, inability to connect to telematics systems, dashboard warning lights, and possible reduced functionality of other connected systems.

3. What causes the U0191 code to appear?

Common causes include a faulty Telematics Control Module, damaged or corroded wiring, poor electrical connections, or a malfunctioning CAN (Controller Area Network) bus system.

4. Can a dead battery trigger the U0191 code on my Buick?

Yes, a dead or weak battery may disrupt communication between modules, potentially causing the U0191 code to appear.

5. How do you diagnose the U0191 code in a Buick?

Diagnosis involves inspecting the TCM for proper operation, checking wiring and connectors for damage or corrosion, and verifying CAN bus communication with a diagnostic scanner.

6. Can the U0191 code cause drivability issues in a Buick?

Generally, U0191 does not directly affect drivability but may disable telematics and other connected systems.

7. How can I fix the U0191 code on my Buick?

Repairs may include replacing or reprogramming the Telematics Control Module, repairing damaged wiring or connectors, or resetting the system with a scan tool.

8. Is it safe to drive with the U0191 code active on my Buick?

While the vehicle is usually safe to drive, the loss of telematics functions like OnStar could compromise emergency communication capabilities.

9. Can software updates resolve the U0191 code on a Buick?

Yes, in some cases, updating the vehicle's software or reflashing the TCM may resolve communication issues.

10. What tools are needed to diagnose and fix the U0191 code?

Youâ€™ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for testing wiring, and possibly access to Buick service manuals for wiring diagrams.