I recently took delivery of a brand new 2018 PPV. I had a set of takeoff 20" wheels and LX20 tires installed by a wheel shop. I took the Tahoe to my dealer to have the computer reprogrammed for the new tire size. I did the same thing on my 2015 PPV and the dealer was able to do it without issue. After 90 minutes of waiting, the service advisor came back and said it was impossible, that GM could not/would not provide them the "codes" to do it and that was it. I didn't stay around and argue because I went straight from work when they opened and needed to get home and sleep. At least they didn't charge me.
So my question to the hive mind is whether or not this makes any sense, and if it does, what are my options? I've started looking at aftermarket programmers and have considered checking with WAMS, but my preference would be just to get it done by the dealer. Leaving it wrong is just not an option. The speedometer and odometer are about 10% off and that just isn't going to work. Does anybody have any thoughts?
So my question to the hive mind is whether or not this makes any sense, and if it does, what are my options? I've started looking at aftermarket programmers and have considered checking with WAMS, but my preference would be just to get it done by the dealer. Leaving it wrong is just not an option. The speedometer and odometer are about 10% off and that just isn't going to work. Does anybody have any thoughts?