OBD code U0198

The vehicle has lost communication with the telematics, emergency call, connectivity or remote services module.

Estimated severity

Medium

Common symptoms

Connected services unavailable
No remote vehicle status or location
Emergency call or SOS warning
Telematics data missing in fleet platforms
Other modules report communication loss with the telematics unit

Likely causes

Telematics module without power or ground
Internal module fault
CAN or LIN communication fault depending on architecture
Antenna or connectivity problem in some vehicles
Fault after battery replacement, accessory installation or body repair

Recommended checks

1. Check whether the vehicle can communicate with the telematics module using a scanner.
2. Verify fuses, power supply and ground for the module.
3. Inspect recent work: battery, radio, dashboard, tracker or accessory installation.
4. Check network wiring and connectors to the telematics unit.
5. Confirm whether the fault affects only connected services or also other modules.

What does code U0198 mean?

U0198 indicates that the vehicle network cannot communicate with the telematics module. It may not affect driving directly, but it can disable eCall, connected services, remote diagnostics, location, fleet-data reporting or manufacturer apps. This is especially relevant for operators who depend on telematics data.

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