LGM is the lift gate module. It can fail, but it's not that common.
Battery is a consumable, after 4-5 years.
Did you actually pay that much for the resistor module, or is that just what they quoted you?
What else has contributed to that $5k (if you feel like sharing it here, that is), and how many miles do you have?
the module i got for $50.00 needed it badly its freezing up here this week , the quote was for harness connector I almost died with laughter
when i was told . the problem wit these guys ( i don't mean all dealers I mean corporate GM )is they wont stand behind their product and try to steal every penny from us after they sell to us .
$5k is form almost every think that was posted on other sites about the 05 happened to me . even the driver door module ( which thank god i was able to fix myself too ) exhaust manifold , manifold blots , bearings , fuel pump , fuel sensor , water pump 3 times , fan clutch twice ..... don't want to go on any more i get pissed thinking about it ....
and all this at 140 000 km .