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Can you program a replacement keyless entry remote at home or does it need to go to the dealer?
Some locksmith shops can reprogram keys, perhaps even the AAA can tell you who can do it in your area. After that a repair shop that specialize in GM products may have the software.
Q&A > Cadillac > 2003 Cadillac DeVille
Common Problems > Cadillac DeVille
Q&A > Cadillac > 2002 Cadillac DeVille
Q&A > Cadillac > 2004 Cadillac DeVille