Two Problems With 04 Denali Xl

[Z-burb]

I have a 2004 Yukon Denali XL that I am have a couple problems with

1: Is I keep getting a message saying "service ride control" It has the air suspension but I don't hear the compressor coming on.

 

2: When I take a long ride to a lower elevation( I live at 7200ft) I get a CEL and it is code 101 mass air out of spec. It happened just yesterday when I went to 5100ft and first had it happen when I went to Milwaukee, WI with it in Sept. I wound stopping at a checker and put a new air filter in it. the light went off until the next day then cam back on.

 

I am taking it to FL in two weeks and am towing a small trailer and having 5 people + luggage in it. SO I want to get both these problems solved before I go.

 

any ideas on what is the problems and the cure?

 

Tim