U2100 GM: CAN BUS COMMUNICATION MALFUNCTION (BUS OFF)
POST UPDATED IN May, 2023
U2100 GM: CAN BUS COMMUNICATION MALFUNCTION (BUS OFF)
The GMLAN (General Motors Local Area Network) is an electrical system through which the various controllers installed in the vehicle are connected. Through the GMLAN, data and operating commands are sent, with which it is possible to achieve good vehicle performance. Transmission errors and reception errors are counted from the BCM (Body Control Module). The counter increases when errors are encountered and decreases when there are no error messages.
When the U2100 OBD2 diagnostic code is set on GM (General Motors) vehicles, it is because the CAN bus has experienced operational problems. The CAN bus communication has been affected, and many invalid messages have been sent on the GMLAN serial data circuits.
The reasons for the DTC U2100 OBDII code being set on your GM vehicle are:
To troubleshoot the U2100 OBD2 fault code on General Motors manufacturer vehicles consider the following: