| U2000 | Audio Rear Control Unit is Not Responding |
| U2001 | Audio Tape Deck Unit is Not Responding |
| U2002 | Audio Bezel is Not Responding |
| U2003 | Audio Compact Disk / Disk Jockey Unit is Not Responding |
| U2004 | Audio Steering Wheel Control Unit is Not Responding |
| U2005 | Audio Rear Integrated Control Panel Unit is Not Responding |
| U2006 | Audio Remote Climate Control Unit is Not Responding |
| U2007 | Audio Navigation Unit is Not Responding |
| U2008 | Audio Phone is Not Responding |
| U2009 | Audio Front Control Module (ACM) is Not Responding |
| U2010 | Module is Not Responding (Non SCP) |
| U2011 | Module Transmitted Invalid Data (Non SCP) |
| U2012 | Communication Bus Error (Non SCP) |
| U2013 | Compass Module is not Responding |
| U2014 | Audio Subwoofer Unit is Not Responding |
| U2015 | Signal Link Fault (Non SCP) |
| U2016 | Signal Link Short to Ground (Non SCP) / From NGV Module |
| U2017 | Driver Side Crash Sensor Communication Fault (Non SCP) |
| U2018 | Passenger Side Crash Sensor Communication Fault (Non SCP) |
| U2019 | Audio Voice Module Not Responding |
| U2020 | Audio Center Amp is not responding |
| U2021 | Invalid /fault data received (Non SCP) |
| U20BB | Communication Loss with TCM |
| U2108 | Lost Communications with ABS/TCS Control System U2108 (GM) |
| U2150 | SCP (J1850) Invalid Data from REM |
| U2152 | SCP (J1850) Invalid Data from GEM |
| U2160 | SCP (J1850) Invalid Data from IC |
| U2195 | SCP (J1850) Invalid Data from SCLM |
| U2500 | (CAN) Lack of Acknowledgement From Engine Management |
| U2510 | Received Data Does Not Match (Ford) |
