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I tried to start my truck using the remote and nothing happened. Last time I used it was a week ago without any issues. I was able to start in the old fashioned way
A few things could be the problem. Bad battery in the remote/key fob. You have a check engine light on or stored DTC. Or even the battery(s) could be weak.
Is there any warning lights, CEL? Codes? A lot of these remote start devices won't work if there's any sort of a warning light on. Possibly even stored codes?
There may also be safety switches on other components such as the parking brake. Examine things like that.
Any additional info? Is the remote start on the same FOB as unlock/lock? If not, check remote battery.
So I just got home and tried the second Key FOB, The horn does not honk, although the side markers blink once. The doors will lock and unlock with the FOB?
Have batteries in the truck load tested and have truck scanned for codes I would do the code scanning first Incase both batteries get disconnected at the same time.
The other thing you can try is to go in and turn remote start off, shut the truck off, take a ride, shut the truck off, fire it up again, turn remote start back on, shut the truck off and give it a shot.