OBD-II code · Network
U0198 Lost Communication with Telematic Control Module
The vehicle has lost the telematics module (eCall / Connected Services / TCU). Emergency call, remote services and over-the-air features are unavailable until the module is back online.
Is it safe to drive with U0198?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyTCU unpowered or backup battery dead
- Less likelyMobile antenna disconnected
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Telematics Module, Can Bus Wiring
Related codes
- U0195Lost Communication with Satellite Radio Receiver Module
- U0196Lost Communication with Rear Seat Entertainment Control Module
- U0197Lost Communication with Hands-Free Phone Control Module
- U0199Lost Communication with Door Control Module
- U019ALost Communication With Tachograph Module
- U019BLost Communication With Battery Charger Control Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.