U0197 on Volvo: How to Diagnose & Fix
Lost Communication With Telephone Control Module
1 Volvo model · 1 documented issue
U0197 on Volvo by model: symptoms, diagnosis and fix
Owners of SPA-platform Volvos including the 2023-2025 XC90 continue to report TCAM-related failures where the vehicle loses cellular service, Volvo Cars app communication, GPS position, remote start/lock functions, and sometimes emergency-call features. In many cases the issue appears as an intermittent 'SOS service required' or connectivity warning, often after software glitches or low-voltage events. The problem is well documented in owner forums and dealer service visits, with some vehicles requiring module reset, software reload, or TCAM replacement.
Common Symptoms
- SOS service required message
- No LTE or internet connection
- Volvo Cars app cannot communicate with vehicle
- Remote lock/unlock or remote start unavailable
- GPS location incorrect or unavailable
- Intermittent eCall/telematics warnings
How to Fix
Diagnose battery state and low-voltage history first, then scan the telematics network and verify antenna/module communication. Dealers often perform a TCAM reset, software reload, or replace the TCAM if faults return. If the vehicle also has repeated 12V battery warnings, address battery condition and charging-system behavior because undervoltage can trigger or worsen telematics faults.
Sources for this issue (1)
U0197 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0197 mean on a Volvo?
U0197 stands for "Lost Communication With Telephone Control Module." A generic network code that sets when a module loses the expected data messages from the Telephone Control Module, which manages hands-free/Bluetooth phone functions. Set after the module fails to respond for a calibrated period. On Volvo it is documented across 1 model: XC90.
What are the most common causes of U0197?
The most common causes of U0197 are: Loss of power or ground to the telephone control module, Open, shorted, or corroded bus wiring, Loose or corroded connector, Blown fuse, Failed telephone control module. The specific cause varies by vehicle.
How much does it cost to fix U0197 on a Volvo?
Repair costs vary widely with the root cause and Volvo model; each issue on this page carries its own estimate where one is published.
Looking for U0197 on a different make?
View U0197 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.