U164500 on Audi: Ethernet Information Electronics Control Module 1 no communication
Diagnostic trouble code U164500 on Audi vehicles — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does U164500 mean?
U164500 indicates: Ethernet Information Electronics Control Module 1 no communication.
This relates to the Network / communication system.
Common causes of U164500
communication partner (Information Electronics Control Module 1 / J794) not responding on Ethernet
fault in voltage supply to the control module
fault in the Ethernet cable between J794 and the gateway J533
What to check (live data)
Ethernet data bus communication status in J533 gateway event memory
voltage supply to J794
Ethernet connection speed (1 Gbit/s) between J794 and J533
Parts often involved in U164500
Ethernet cable (shielded or unshielded, 0.13 mm² copper-magnesium alloy strands)
control unit 1 for information electronics J794
data bus diagnostic interface J533 (gateway)
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 U164500 — 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.
U164500 is a diagnostic trouble code: Ethernet Information Electronics Control Module 1 no communication.
What are the common causes of U164500 on an Audi?
Common causes include: communication partner (Information Electronics Control Module 1 / J794) not responding on Ethernet, fault in voltage supply to the control module, fault in the Ethernet cable between J794 and the gateway J533. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving an Audi with U164500?
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 U164500 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 U164500 on your specific Audi.