AutoCodes – Cadillac – U0198 Cadillac

U0198 Cadillac Code - Lost Communication With Telematic Control Module

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 Telematic Control Module, Telematic Control Module harness is open or shorted, Telematic Control 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: U0198 Cadillac indicates Lost Communication With Telematic Control Module.
Common causes: Common causes include Faulty Telematic Control Module, Telematic Control Module harness is open or shorted, Telematic Control 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 2,556

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 U0198 Cadillac 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 Telematic Control Module has not been received.

OBDII Code U0198 Cadillac - Lost Communication With Telematic Control Module - AutoCodes.com — U0198 Cadillac Code - Lost Communication With Telematic Control Module

What does this mean?

What are the Possible Causes of the DTC U0198 Cadillac?

Faulty Telematic Control Module
Telematic Control Module harness is open or shorted
Telematic Control Module circuit poor electrical connection

How to Fix the DTC U0198 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 U0198 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 U0198 Cadillac Code

1. What are the common symptoms of OBDII code U0198 in a Cadillac related to lost communication with the telematic control module?

The common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, loss of telematics services in the vehicle, and potential issues with features like GPS navigation or remote start.

2. What can cause the OBDII code U0198 in a Cadillac indicating lost communication with the telematic control module?

The code U0198 can be triggered by a faulty telematic control module, damaged wiring or connectors leading to the module, a software glitch, or a communication network error within the vehicle.

3. How can I diagnose the OBDII code U0198 in my Cadillac if I suspect a problem with the telematic control module?

To diagnose the issue, you can perform a visual inspection of the wiring and connectors, check for any related recalls or service bulletins from Cadillac, use a diagnostic scan tool to retrieve trouble codes, and perform specific tests recommended by the manufacturer.

4. Is it safe to continue driving my Cadillac with the U0198 code related to lost communication with the telematic control module?

While the vehicle may still be operable with the code present, it is recommended to address the issue promptly to avoid potential safety risks and ensure proper functioning of telematics features in your Cadillac.

5. Are there any DIY repair tips for resolving the U0198 code in a Cadillac experiencing communication problems with the telematic control module?

DIY repair tips include checking and securing the wiring connections leading to the telematic control module, resetting the module by disconnecting the battery for a few minutes, and ensuring that software updates are current.

6. Can a professional mechanic help fix the U0198 code in my Cadillac related to the telematic control module communication issue?

Yes, a professional mechanic with experience in diagnosing and repairing electronic control modules can assist in resolving the U0198 trouble code by performing advanced diagnostic tests, checking for software updates, and replacing faulty components if necessary.

7. Will resetting the OBDII code U0198 in my Cadillac temporarily resolve the issue of lost communication with the telematic control module?

Resetting the code may temporarily clear the MIL, but if the underlying issue causing the lost communication is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. How do I know if the telematic control module in my Cadillac needs to be replaced when dealing with the U0198 trouble code?

If all other potential causes have been ruled out, and the telematic control module is confirmed to be faulty or unresponsive to diagnostic tests, then replacement may be necessary to resolve the U0198 code and restore communication.

9. Can extreme weather conditions or environmental factors contribute to triggering the U0198 code in a Cadillac with telematic control module communication issues?

Extreme weather conditions or environmental factors like water exposure, corrosion, or physical damage to the vehicle's wiring can potentially lead to communication problems with the telematic control module, triggering the U0198 code.

10. How can I prevent future occurrences of the U0198 code in my Cadillac related to lost communication with the telematic control module?

Regularly inspecting and maintaining the vehicle's wiring, connectors, and electronic components, following manufacturer-recommended service schedules, and addressing any warning signs promptly can help prevent future instances of the U0198 trouble code.