Lost Communication With Telematic Control Module
The U0198 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Telematic Control Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $600 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Connected vehicle services unavailable
- Remote start from app not working
- Vehicle location tracking disabled
- OnStar or similar service not responding
- Emergency SOS button inoperative
Probable Causes (Ranked by Likelihood)
- Failed telematics control unit Very High
- Cellular antenna disconnected or damaged High
- Telematics subscription expired or deactivated Moderate
- Software update failure in telematics module Moderate
Step-by-Step Diagnostic Procedure
-
Verify the telematics subscription is active with the service provider
-
Check the cellular antenna connection (usually on the roof)
-
Inspect the telematics module connector for corrosion
-
Verify power and ground at the telematics module
-
Check for software update availability through the dealer
Frequently Asked Questions
Can I drive with code U0198?
Yes, safe to drive. Connected services like remote start, vehicle tracking, and emergency calling will be unavailable but driving is not affected.
What causes U0198?
Often a failed telematics module or disconnected cellular antenna. Check your subscription status first since an expired plan can trigger this code.
Is U0198 expensive to fix?
Typically $100 to $600. Verify the subscription is active before spending money on repairs. Module replacement with service activation is on the higher end.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.