Every time I remote start my 2014 dodge journey limited It starts up.for about 20 seconds and then it shuts itself off. Any suggestions?

 

Check the owners manual for things that can cause the remote start to turn off.

 

I already looked. There's nothing in the Manual about issues with the remote start.

 

Try sitting in car and look at dash with remote start triggered. Is run/start button flashing after car starts up. Is there anything you see when the car actually stalls out.

Hood switch and brake pedal button are the two critical switches for operation. It’s possible one is flaky. Try using meter and check for continuity while triggering switch mechanism manually. Maybe measure ohms resistance and compare it to a new switch measurement.
Could try old school clear the ecm memory procedure, unhook car battery power for ten mins to see what it does.
If you have a second key fob remote, try starting with that.
Scan for codes even if check engine light is not on, what codes are there.
Put parking brake on and try another remote start cycle.

 

 

I know from personal experience if the CEL is on it will run for roughly 20 seconds ish and kill itself to prevent any possible damage, it doesn't matter if the code it's throwing is minor like a wheel speed sensor it will shut itself off. Check to see if maybe it's throwing any engine codes.