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I replace my alternator in my 2002 Cadillac DeVille now the car won't start and service theft system comes on have tried to reprogram transponder key but won't do it any suggestions
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,579 Posts
Have you pulled the DTC's? If not, do so, post the codes AND their definitions.

P.S.
Does it crank, but not start or no crank at all?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,059 Posts
simply replacing an alternator will not have any affect on the anti-theft system -

need a LOT more - specific - information -

STEP #1 - ALWAYS - check for DTC's - Diagnostic Trouble Codes -
if you don't know how - go here -

post any codes you have -
ALONG WITH THEIR DEFINITIONS -

include whether they are C-Current or H-History -

for code definitions - go here -


here is a how-to video -
 
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