I know there are a bunch of threads but they seem to be with LEDs or aftermarket housings so I’ll take the brunt of asking this. Every light is working even 3rd brake light. I have OEM housings and halogen lights i do have reverse LED canbus error free. Could the bulb still be bad or is it likely the socket? I find it strange I can put 3” cluster back in and don’t get the message.
The problem you are experiencing is very difficult to understand from your explanation and is becoming more confusing with your additional posts.
Let me try to help with identifying the problem or problems by asking questions and you can inform me if I understand correctly and have all the facts straight.
You have traditional OEM lighting with Halogen headlights and LED reverse lights.
Yes or something different?
All the exterior lighting works correctly except AlfaOBD is showing a L tail lamp wiring fault. Yes or something else?
Has anyone recently performed any work on the L tail lamp or associated wiring?
Do you also see the fault on the EVIC?
Were the reverse lights recently converted to LED or no, they have been working for a period of time?
You have also recently upgraded the 3" cluster to a 7" EVIC. Yes?
Is this when the fault notification started?
I'm not clear on if you've also upgraded to a Uconnect radio at the same time, yes or something else?
When you switch back to the 3" cluster, the fault on AlfaOBD clears, yes or something else?
Was everything working correctly before the switch from the 3"cluster to the 7" EVIC?
Have you changed anything else at the same time as the EVIC change?
Please use the quote button and answer inline with my text using a space below each question and preferably a different font, if possible.
Please answer all questions or ask for a clarification if it isn't clear.
This information will assist members to help you get this sorted.
.