Audi Q4 Door Lock System Complete Failure Alert

I had a similar issue with my 2019 Audi e-tron. As someone with some hands-on experience maintaining EVs, I can share my troubleshooting journey. The symptoms matched yours exactly, the automatic locks stopped responding completely. After inspection, it turned out the door sensor wiring had a loose connection near the door latch. The electrical issue was causing inconsistent signals to the central locking system. I took it to an authorized workshop where they diagnosed the door switch connection problem. The repair involved reconnecting and securing the wiring to the door sensor module. The total cost was 95 Euro including diagnostic work and repair. The fix was relatively straightforward once properly diagnosed, but accessing the door latch assembly required specialized tools and expertise. The automatic locks have worked flawlessly since the repair. To better assist with your specific case, could you share: Whether you notice any clicking sounds when trying to lock/unlock, If the issue affects all doors or just one, Whether the key fob battery has been recently replaced, If you see any error messages on the dashboard This information would help determine if you are facing the same underlying problem.

Thanks for sharing your experience. My car has 26252 KM and just had its annual service last month. When trying to lock or unlock, I hear no clicking sounds from any of the vehicle doors. The issue affects all doors simultaneously. I replaced the key fob battery as a first troubleshooting step, but this made no difference. The dashboard shows no error messages. Based on your description, it does sound like a similar wiring harness problem. The complete failure of all door sensors at once suggests it might be a central connection issue rather than individual door switch failures.

Your situation does sound very similar to what I experienced, especially with the complete system failure affecting all doors. In my case with the 2019 e-tron, after the wiring fix I mentioned, we actually discovered the main door latch assembly was also contributing to the problem. The central locking system relies on signals from multiple door sensors, and when the main control unit stops receiving these properly, it can cause a system-wide shutdown. Since you mentioned having no error messages or clicking sounds, this reinforces my suspicion of a central wiring issue rather than individual door sensor failures. The repair on my vehicle ultimately required: Testing the main wiring harness connections, Replacing the primary door latch assembly (320 Euro), Recalibrating the car alarm system The mileage on my car was around 25000 KM when this occurred, quite close to yours. One thing I noticed before the complete failure was that the automatic locks would occasionally work with a delay, though I dismissed this at the time. Given the similarities, I would suggest requesting the workshop specifically check the main wiring harness connection points and the primary door latch assembly when you get it serviced. This could save diagnostic time and potentially cost.

Thanks for the detailed information. After checking all door locks again today, I noticed something new that might be relevant, there is a very slight delay between pressing the key fob and hearing the car alarm chirp, though still no lock movement occurs. The wiring harness issue you described makes a lot of sense given the complete system failure. I will definitely mention these specific points to the workshop when I take it in: Check main wiring harness connections, Inspect primary door latch assembly, Test central locking control unit, Verify car alarm system functionality I managed to get an earlier appointment next week by explaining the safety implications of having no working locks. Will update once I know the exact cause and repair needed. The service advisor mentioned they have seen similar cases where the automatic locks failed due to wiring issues, so hopefully this will be a straightforward fix like in your case, even if it costs a few hundred Euro for parts and labor.