AutoCodes – Generic – U0198

U0198 Code - Lost Communication With Telematic Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. 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 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 23,772

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 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Telematic Control Module has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0198?

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?

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 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.

Need more information about the U0198 code?

Need more information on how to fix the U0198 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0198 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0198 Buick — Lost Communication With Telematic Control Module
U0198 Cadillac — Lost Communication With Telematic Control Module
U0198 Chevrolet — Lost Communication With Telematic Control Module
U0198 Ford — Lost Communication With Telematic Control Module
U0198 GMC — Lost Communication With Telematic Control Module
U0198 Lincoln — Lost Communication With Telematic Control Module
U0198 Mercury — Lost Communication With Telematic Control Module

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 Code

1. What are the common symptoms of OBDII code U0198?

The common symptoms of U0198 "Lost Communication With Telematic Control Module" may include issues with the vehicle's telematics system, loss of communication with the module, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U0198?

The possible causes of U0198 include a faulty telematic control module, damaged wiring or connectors related to the module, software issues, or a weak battery.

3. How does the telematic control module impact the vehicle's operation?

The telematic control module plays a crucial role in providing various services like emergency assistance, remote diagnostics, and vehicle tracking. Loss of communication with this module may affect these functions.

4. Can U0198 be cleared/reset, or does it require a repair?

U0198 can be cleared/reset using an OBDII scanner, but if the underlying issue persists, the code is likely to reappear. It is essential to diagnose and repair the root cause to prevent future occurrences.

5. What steps can be taken to diagnose the U0198 code?

Diagnosing U0198 involves checking the wiring and connectors related to the telematic control module, inspecting the module itself for any visible damage, and performing a software update if necessary.

6. How can one repair OBDII code U0198?

Repairing U0198 may involve replacing the faulty telematic control module, repairing damaged wiring or connectors, updating software, or addressing any underlying issues causing the communication loss.

7. Is it safe to continue driving with the U0198 code present?

While the vehicle may still be operational with U0198 present, it is advisable to address the issue promptly to restore full functionality of the telematics system and ensure all vehicle systems are communicating properly.

8. Can a DIY enthusiast fix the U0198 code, or should it be handled by a professional?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address U0198 by checking wiring connections and replacing the module. However, complex diagnostics and repairs may require professional assistance.

9. Will fixing the U0198 code affect the vehicle's warranty?

If the vehicle is still under warranty, it is recommended to have the issue diagnosed and repaired by an authorized service center to avoid voiding the warranty. Be sure to check with the manufacturer for specific details.

10. Are there any preventative measures to avoid encountering the U0198 code in the future?

Regular maintenance, keeping the vehicle's electrical system in good condition, and addressing any warning lights promptly can help prevent issues like U0198 from occurring.