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If your 2006 Cadillac STS remote start feature isn't working, it may be due to a dead battery in your fob. All key fobs use a CR2032 coin-shaped battery, which typically costs around $5 each. These batteries can be found in the same place as regular batteries. To replace the battery, you'll need to access the back panel of the fob. The process may vary depending on the fob model - some can be opened by pulling down on the back panel, while others may require removing a couple of small screws. With a small screwdriver, removing the screws should be fairly straightforward, allowing you to replace the old battery with a new one.
If your 2006 Cadillac STS's remote start function isn't functioning, ensure to examine the battery in your key fob for potential issues.