starts then dies
It is still under original warranty - take it to the dealer and let them fix it. If it will not run, Cadillac will either tow it to the dealer or send a mechanic to try and fix it on site. All of this is not cost to you. (unless you are over 50k miles.)
Fuel pump? Powertrain warranty is 100,000 miles so even if over 50,000 miles it might still be covered.
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