Subaru Starlink in your 2020 Forester provides connected services including remote start, stolen vehicle tracking, emergency assistance, and infotainment features. When Starlink stops connecting or displays service unavailable messages, identifying whether the problem is account-based, hardware-related, or connectivity-dependent guides effective troubleshooting.
Starlink System Components
The Starlink system includes a telematics control unit (DCM - Data Communication Module) with cellular connectivity, GPS receiver, and integration with the vehicle's systems. The infotainment head unit displays Starlink app content. Cellular network coverage is required for most connected features, while GPS provides location services.
Subscription and Account Issues
Most Starlink connected services require active subscriptions. Trial periods expire, payment methods fail, or account information becomes outdated. Verify your subscription status at SubaruStarlink.com or through the MySubaru app. Some features included free for a period may now require paid subscription renewal.
Cellular Connectivity Problems
The DCM relies on cellular networks for data transmission. Poor cellular coverage in your area, network congestion, or carrier issues can prevent connection. The system may work in some locations but not others based on coverage. AT&T network transitions have affected some older Starlink-equipped vehicles.
Module Hardware Failures
The DCM module can fail, losing cellular connectivity or GPS reception. Antenna connections may corrode or loosen. Power supply issues to the module prevent operation. Hardware failures typically cause complete loss of all connected features simultaneously.
Code U0422 Interpretation
Code U0422 indicates lost communication with the telematics control module. This suggests the DCM has stopped communicating on the vehicle network, whether from power supply issues, module failure, or network communication problems. Further diagnosis determines if the module itself has failed.
Software and App Updates
Starlink functionality depends on both vehicle software and smartphone app versions. Outdated apps may not communicate properly with current server systems. Vehicle software updates sometimes address Starlink connectivity issues. Check for available updates through the dealer or over-the-air if your vehicle supports it.