U15C000 on Audi: Control module for emergency call module and communication unit received malfunction value
Diagnostic trouble code U15C000 on Audi vehicles — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does U15C000 mean?
U15C000 indicates: Control module for emergency call module and communication unit received malfunction value.
This relates to the Network / communication system.
Common causes of U15C000
Malfunction value received by emergency call module control unit and communication unit J949 via infotainment CAN bus or Ethernet communication
Fault in CAN bus or Ethernet connection between J949 and gateway/central data bus communication control unit
Loss of wake-up signal via CAN bus connection to central control unit for data bus communication J1273
Mobile communications module (UMTS/GSM/5G) fault affecting data transfer
Emergency battery fault or failure (battery has fixed 7-year replacement interval)
Aerial connection fault (external mobile phone aerials or internal backup aerial)
What to check (live data)
Infotainment CAN bus signal status between J949 and gateway
Ethernet communication status between J949 and gateway
CAN bus wake-up signal from J1273 to J949
A2B speech data bus status
Emergency battery charge status
Mobile network connection status (UMTS/GSM/5G)
Parts often involved in U15C000
Emergency call module control unit and communication unit J949
Data bus diagnostic interface J533
Emergency call module aerial R263
Front left microphone R140
Front right microphone R141
Emergency battery (comprising 2 special rechargeable batteries)
Central control unit for data bus communication J1273
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for U15C000 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
U15C000 is a diagnostic trouble code: Control module for emergency call module and communication unit received malfunction value.
What are the common causes of U15C000 on an Audi?
Common causes include: Malfunction value received by emergency call module control unit and communication unit J949 via infotainment CAN bus or Ethernet communication, Fault in CAN bus or Ethernet connection between J949 and gateway/central data bus communication control unit, Loss of wake-up signal via CAN bus connection to central control unit for data bus communication J1273, Mobile communications module (UMTS/GSM/5G) fault affecting data transfer. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving an Audi with U15C000?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix U15C000 on an Audi?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for U15C000 on your specific Audi.