U170C00: Rearview camera system control module No communication on Ethernet data bus
Diagnostic trouble code U170C00 — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does U170C00 mean?
U170C00 indicates: Rearview camera system control module No communication on Ethernet data bus.
This relates to the Network / communication system.
Common causes of U170C00
No communication on Ethernet data bus between rearview camera system control unit J772 and other modules
Faulty voltage supply to rearview camera system control unit J772 (Terminal 15 power loss)
Interruption or fault in the shielded cable carrying image data from J772 to J794
Faulty Extended CAN connection to J772
What to check (live data)
Terminal 15 power supply to J772
Terminal 31 (ground) connection to J772
Extended CAN High signal at J772
LVDS High/Low signals on shielded cable between J772 and J794
Parts often involved in U170C00
Rearview camera system control unit J772
Information electronics control unit 1 J794
Shielded FBAS cable between J772 and J794
Shielded LVDS cable
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 U170C00 — 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.
U170C00 is a diagnostic trouble code: Rearview camera system control module No communication on Ethernet data bus.
What are the common causes of U170C00?
Common causes include: No communication on Ethernet data bus between rearview camera system control unit J772 and other modules, Faulty voltage supply to rearview camera system control unit J772 (Terminal 15 power loss), Interruption or fault in the shielded cable carrying image data from J772 to J794, Faulty Extended CAN connection to J772. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving with U170C00?
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 U170C00?
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 U170C00 on your specific vehicle.