2009 Buick LaCrosse Unlocking With Remote problem ?

Have a 2009 Buick LaCrosse sedan.
The Remote won't unlock the doors, or the trunk anymore.
Have a new battery in it.
Before I bring it in, thought I'd ask here first.
What usually goes for this type of problem:
the Remote itself, or a "receiver" module in the car ? Or,...?
If a Remote, how expensive, usually ?
(are third party cheaper ones avail.?)
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The remote itself is the most likely because of the ruggedised environment it operates in - your pocket.
That depends on the dealer.
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The remote is cheap, the coding in to the car is the catch. The price for getting that done depends on the dealer/locksmith you get it done by.
As an aside, I don't know if it applies to your car, oftentimes the coding process requires another *working* remote in order to program in a new remote. I get the impression you may not have a second remote.
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