OBD2 Car ScannerWhat does U2003 mean?
U2003 stands for Audio Compact Disk / Disk Jockey Unit is Not Responding. Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Network codes cover the communication between the car's computer modules. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Low or weak battery
- Damaged network wiring or connector
- A module that has lost power or failed
- Aftermarket accessories interfering with the network
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does U2003 mean?
U2003 means “Audio Compact Disk / Disk Jockey Unit is Not Responding”. It belongs to the network communication group: Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Is it safe to drive with U2003?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear U2003?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- U1950UPB Communication Bus Fault
- U2000Audio Rear Control Unit is Not Responding
- U2001Audio Tape Deck Unit is Not Responding
- U2002Audio Bezel is Not Responding
- U2004Audio Steering Wheel Control Unit is Not Responding
- U2005Audio Rear Integrated Control Panel Unit is Not Responding
- U2006Audio Remote Climate Control Unit is Not Responding
- U2007Audio Navigation Unit is Not Responding
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.