Support · Troubleshooting

ENET Cable Not Working? Fix It in Order

90% of 'dead cable' reports are configuration issues. Work through the symptom table top to bottom before assuming hardware failure.

Back to Setup Guide

01 / SYMPTOMS

The Master Symptom Table

Symptom	Likely Cause	Fix
No IP address on interface	DHCP timeout / bad cable seating	Re-seat OBD2, ignition cycle, wait 30s; check adapter volt display shows power
169.254 address but no VIN read	Firewall blocking / wrong interface selected	Allow through firewall; select the ENET interface explicitly in software
E-SYS 'connection refused'	Wrong gateway URL / car asleep	Wake car (open door/press start), recheck ZGW address, retry
Random disconnects	Laptop adapter power saving / voltage sag	Disable USB & NIC power saving; attach battery maintainer
WiFi drops mid-session	2.4 GHz congestion	Router Mode / 5 GHz / switch to USB-C backup for critical work
Works on one car, not another	Second car is pre-DoIP (CAN)	Verify both cars on the compatibility matrix
VM can't see the adapter	USB/Ethernet not passed through	Bridge the ENET interface to the VM or pass USB-C device through

02 / HARDWARE TEST

Prove the Hardware in 5 Minutes

Volt display check (Type-C model): shows 11.8–14.6V with ignition on = adapter powered and seated
Ping test: ping the gateway's 169.254 address — replies mean the link layer is alive
Second device test: connect a phone instead of the laptop — if the phone sees the car, the laptop config is the problem
Second car test (if available): isolates vehicle-side gateway issues

Genuine hardware failure is rare — every unit is continuity-tested before shipping. If the steps above all fail, contact support; warranty replacement ships within 24h.

03 / PREVENTION

Never Troubleshoot Mid-Flash Again

Always attach a battery maintainer for sessions over ~15 minutes (13V+ on the display)
Flash on wired connections only — WiFi is for coding and diagnostics
Disable laptop sleep, NIC power management and VPNs before starting
Keep the E-SYS PSdZData and software versions matched to your target ECU

++ / RECOMMENDED GEAR

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?? / FAQ

Frequently Asked Questions

My ENET cable worked before, now it doesn't — why?

The most common culprits after a working period: a Windows update changed firewall/network profile settings, laptop power management started suspending the NIC, or a VPN client began intercepting the interface. Check those three first.

Is 'unidentified network' an error?

No — it is the expected state for a link-local connection to a vehicle. The car has no DHCP server or internet; APIPA addressing is by design.

Support said to send a log — where is it?

E-SYS logs live in its Logs directory; XENTRY session logs export from the session menu. Include ipconfig output and a photo of the volt display reading — that combination diagnoses 95% of cases in one round.