The Vehicle Communications Interface Module (VCIM) is the OnStar telematics module in GM vehicles. It contains the cellular modem, GPS receiver, and Bluetooth radio that connect the vehicle to OnStar’s service network and to paired phones. The VCIM is identified by RPO UE1 (OnStar equipped) on the SPID label.
The VCIM handles:
- The OnStar Blue Button service connection
- Automatic crash response and stolen vehicle assistance
- Hands-free Bluetooth calling on vehicles where the VCIM (not the HMI/CSM) owns Bluetooth
- The in-vehicle WiFi hotspot
- GPS for OnStar’s turn-by-turn navigation feature
VCIMs are VIN-locked to the vehicle they shipped with. A used VCIM pulled from another vehicle cannot simply be installed — it must be “regreened” (cleared of the original VIN) and reprogrammed before OnStar will activate it on a new vehicle.
GM vehicles built between approximately 2007 and 2014 used VCIMs that depended on 2G and 3G cellular networks. Those networks were shut down in 2022, leaving those VCIMs unable to connect regardless of their physical condition. For these older vehicles, the OnStar service itself is no longer available — but the VCIM can still be reworked for Bluetooth integration.
WAMS offers a VCIM rework service that adds modern Bluetooth paired-phone functionality to legacy VCIMs and re-greens VCIMs pulled from donor vehicles. The service requires you to ship the VCIM to WAMS.