30ft sounds about normal for a factory system some lucky buyers can get 50, (this would be line of sight with 0 obstructions, anything in the way including a wall or window will shorten that distance considerably)
some of the really high end aftermarkets will do much better (1/4 mile claims from some of them) but id be suspicious of that claim myself.
-Phillip's Law: Four-wheel-drive just means getting stuck in more inaccessible places.
Ironically, I just got back to my office from a business lunch and used the remote start feature as I walked back to the D after leaving the restaurant. The parking lot was slammed with vehicles and it was raining lightly when I double-tapped the remote start button. Not being familiar with Aventura Mall, I was pleasantly surprised to find that the D had started and it was still three lanes away. I swear that I walked a good 200+ feet before I got to it and thought to myself how I'd never been able to do that from so far away with my previous GMC truck. Now, I get on here and I read your post. What a coincidence!
Im going to have them look at it again. I went out to lunch and i had to get within 10 ft to get it started. I was opening the door before the initial start had completed. I just hate the idea of them tearing my truck apart.
Make sure the antenna wire is clipped into the harness.
I haven't tested distance on my new D yet, but it is so true that the environment matters. On my last D, I had an aftermarket that was supposed to be good to 2000ft. It was typically good line of sight, if I could see it, it would start. Through buildings was still good for 200+ feet. But - if a cell tower was within a block, forget it. At my usual supermarket where a cell tower is right across the street, I've held the remote a foot from the car and it would refuse to lock/unlock/start - even inches from the remote start antenna.
To the poster that had it work 200 feet from their car in a ramp, I suspect the ramp is pretty well shielding outside signals, and the concrete tunnels the signal, bouncing off the low ceiling.
I don't get why car manufacturers don't get it - they could easily offer an upgraded two way long range unit - I'd sure buy it if it were well integrated. Now I'm reluctant to add an aftermarket system since I don't know how it will play with my keyless-go remotes. Don't want to mess those up.