We have had audio issues with our TLX since we took delivery of it. CarPlay would work for 20 mins at a time and then act as if the phone wasn’t there. Bluetooth audio would fade in and out. The phone microphone in the car would work for the first minute of a call and then go mute. To top it off, we never saw a tank with over 18 MPG with most under 15 MPG.
The first trip to the dealer, they couldn’t find anything wrong, but they did a factory reset and installed the latest update. Things got much worse and so we made a second trip to the dealer. They found a short in the main audio cable (they referred to it as a bus) and replaced it. I can’t imagine how they had a replacement cable in stock, unless this has happed before. Voila it fixed everything. Now all of a sudden it’s getting 5+ MPG better 3 tanks in a row (and getting the MPG the car should be getting). After never getting better than 18 MPG over 6000 miles, we now have gotten low to mid 20’s MPG since they fixed the audio issue. Imagine filling up the tank and the range shows 180 miles to empty. Now when we fill up it shows 270 and continues to rise with every fill up as the memory of the bad gas mileage fades from the trip computer.
I don’t have a good explanation.