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The red light is your security light meaning you either have a bad key or skim module. Do you have another key?
If you don't have another gray headed skim key then the easiest thing would be to call a mobile locksmith to cut and program a new key. And if that doesn't work it's liked a bad module. The correct way to diagnose this issue is with a scantool to see what codes are in the SKIM module b
What other message? Do you have a picture?
Can I get the last 8 digits of your VIN?