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Is this remote start integrated into the ignition key or separate?
When you attempt to remote start it what does it do?
How many times does the horn beep?
If you start the vehicle and shut it off. Get out of the vehicle and attempt to start it does it still beep once and not start?
If that is everything you tried they can test for codes. It will show remote start malfunction. I would look under the hood and inspect the hood switch. It most likely isn't working correctly causing your issue.
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I should ask. Is your check engine light on?
Ok I wanted to make sure. Having a check engine light will disable the remote start as well.