2003 chevy trailblazer_lt
I found when replacing mine that there are many part numbers for the ddm. I found my replacement on ebay for like 79 bucks shipped. It had a different part number than the one being replaced but once it was installed everything worked fine. Just try to find a used one thats close to the model year (or interchangeable with your model year) and you should be fine. Don't get sucked into the dealer for this as its cheap and easy to do yourself.