OBDII Manufacturer Specific U Codes for GM

Manufacturer Specific U Codes for GM

U codes relate to the vehicle’s data network. I’ve included a list of the manufacturer-specific diagnostic trouble codes used by General Motors. These codes are designed to provide additional information beyond the generic OBD-II codes to help diagnose and troubleshoot issues related to GM’s proprietary systems and components.

List of Manufacturer-Specific U Codes for GM.

U2000 Invalid BFC Transmitted SPI Data
U2001 Invalid IPC Transmitted SPI Data
U2002 SPI Data-In Low
U2003 SPI Data-In High
U2004 SPI Data-Out Low
U2005 SPI Data-Out High
U2006 SPI Clock-Out Low
U2007 SPI Clock-Out High
U2050 SIR PPS/CPS Communications Link malfunction
U2100 CAN Bus OFF
U2100 CAN-BUS Communication Malfunction
U2102 More Controllers on Bus than Programmed
U2103 Fewer Controllers On Bus Than Programmed
U2104 CAN Bus Reset Counter Overrun
U2105 CAN Bus Error ECM
U2105 Lost Comm with Engine Control System
U2106 Lost Comm with Trans Control System
U2107 Lost Communications with Body Control System
U2108 CAN Bus Error ABS
U2108 Lost Comm with ABS Control System
U2150 Navigation ECU Gateway Communication Error
U2151 Navigation ECU Communication Malfunction
U2153 VICS ECU Communication Error