General Motors Local Area Network

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General Motors Local Area Network (GMLAN) is an application- and transport-layer protocol using controller area network for lower layer services.[1] It was standardized as SAE J2411 for use in OBD-II vehicle networks.[2]

## Transport-layer services

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Transport-layer services include the transmission of multi-CAN-frame messages based on the ISO 15765-2 multi-frame messaging scheme. It was developed and is used primarily by General Motors for in-vehicle communication and diagnostics.[3] GM's Tech2 uses the CANdi (Controller Area Network diagnostic interface) adapter to communicate over GMLAN.

## Applications

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Some software applications that allow interfacing to GMLAN are Intrepid Control Systems, Inc.'s Vehicle Spy 3; Vector's CANoe; Dearborn Group's Hercules, ETAS' ES-1222, ES590, ES715, and ES580; ScanTool.net's OBDLink MX; EControls by Enovation Controls' CANCapture; and GMLAN vehicle universal remote control GMRC for Android devices

Tesla uses J2411 (single-wire CAN over the Control Pilot) for their DC Supercharger (newer units are also capable of PLC over the control pilot) and AC Destination Charging.[4]

## References

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1. ^ "GMW3089". Retrieved 2018-08-08. "General Motors Local Area Network (GMLAN) Single Wire Controller Area Network (SWCAN) Physical and Data Link Layers Specification"
2. ^ "Controller Area Network (CAN BUS) Protocol | Free Course". Kvaser. Retrieved 2020-09-27.
3. ^ Jeff Hartman (2004-02-13). How to Tune and Modify Engine Management Systems. Motorbooks. pp. 252–. ISBN 978-0-7603-1582-8. "GMW3110"
4. ^ Johnson, Jay; Berg, Timothy; Anderson, Benjamin; Wright, Brian (2022-05-26). Review of Electric Vehicle Charger Cybersecurity Vulnerabilities, Potential Impacts, and Defenses (Technical report). US: Sandia National Laboratories. doi:10.3390/en15113931.