My remote start, starts my vehicle but won't keep it running?

You may need to reset the system.

SEQUENCE ACTIVATED BY THE PARKING BRAKE .
1. While engine is running (key in ignition switch), apply the brakes and hold the pedal down.
2. Move gearshift lever to neutral.
3. Apply the parking brake Once Twice
Note: The system can be set - at time of installation - to require that the parking brake be applied once or twice.
If set for two actuations, pause one second between the two.
4. Remove key from ignition (the system keeps the engine running).
5. Exit the vehicle.
6. Within 60 seconds, close all doors.
7. The system will stop the engine and blink the parking brakes once to confirm the sequence is valid (vehicle is
ready for a remote start command).
SEQUENCE ACTIVATED BY THE REMOTE CONTROL
1. While engine is running (key in ignition switch), apply the brakes and hold the pedal down.
2. Move gearshift lever to neutral.
3. Apply parking brake.
4. Send the start command (Model 801 & 2101 - Model 903 ).
5. Remove key from ignition (the system keeps the engine running).
6. Exit the vehicle.
7. Using the remote, send the STOP command. The system will stop the engine and parking lights will blink once
to confirm that the sequence is valid (vehicle is ready for a remote start command).
http://www.astrostart.com/Support/Guides.aspx

Yes.it takes more amps.to start your vehicle than run the radio

Your car starts and dies due to the failing antitheft system. Your vehicle is not receiving the "fuel enable" signal that it needs to keep running. So the injectors get turned to off to prevent theft. You will need to diagnose which part of the antitheft system is failing. Or bypass the entire security system. This link will help you understand the problem, and depending on the year of your vehicle, possibly a good bypass solution.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Without doing testing we'd only be guessing ,having a qualified repair shop run diagnostic's on it would be your best bet .
003 Engine Peformance Tests Scan Data Tests
Rigging the vehicle's isn't fixing it . This can cause problems your not aware of. Do yourself a favor an have it fixed correctly

You have 2 issue going on. Its not seeing a valid key,and it is starting with the remote.Your remote entry key did it happen to get wet? Or moisture get in? Lock the vehicle up using the key. enter the vehicle using the key fob.After the vehicle unlocks you have 60 seconds to enter the vehicle insert the key in the ignition start it up.Your remote start up is out of step.

Buy yourself a volt meter and check the batter voltage before and after it starts. You should read 12 volts before starting and around 14 volts once it starts and the alternator is charging the battery. Also check for loose connections between the alternator and battery. Check that the ground wire from the battery is secured to the vehicles frame. Good luck!

The 'Keyless Entry & Burglar Alarm System" is activated. You must 'Disarm' the system using the Keyless Entry Remove (Key Fob) to "Reset" the system. The reason the engine won't start is due to the burglar alarm - it has a "Starter Kill" circuit which is activated when the alarm is activated. The alarm must be DEactivated to DEactivate the 'Starter Kill' circuit.
Another way to start the engine is to get in the car, put the key in the ignition and turn it to 'ON" and wait 3 to 5 minutes until the emergency flashers stop/turn off. Afterward, you should be able to start the engine. NOTE: This does NOT reset the burglar alarm. It will go off again when you enter the vehicle without using the remote/key fob.

The 2003 Sonata is equipped with a 'starter KILL' burglar alarm system with disables the starting system (using a N/C 'contacts' configuration instead of a N/O contacts configuration). N/C=Normally closed, and N/O=Normally open contacts. When the alarm goes off with a MY Sonata, the only way to DISARM it is with the key fob (remote) originally programmed for it (unless you purchase a new remote & have it programmed for the vehicle at an authorized Hyundai Service Department). NOTE: So long as the keyless entry & burglar alarm system is functioning/operating normally, the alarm will keep going off and the STARTER KILL function will still prevent you from starting the vehicle. One option is left without purchasing a new remote and having it programmed.
1. When the alarm goes off, get into the vehicle and insert the ignition key into the ignition.
2. Turn the key to the 'RUN' position (NOT the ACC position) and wait for the alarm to STOP (usually about 3 to 5 minutes).
3. The engine should then start using the ignition key.

If this procedure doesn't work, the problem will need further diagnosis by a qualified/certified Hyundai Service Technician.

Hope this helps

I had the same problem when my battery went flat and tried to use jumper cables connected to another vehicles battery. I called Volvo and they said I need to disconnect the battery terminal to reset the computer. After re-conecting it the remote control worked again and I was able to jump start the car. Maybe your car's computer went into a similar state.

Keep driving it like that & it won't work at all

When ever you even think you have a transmission
issue,you immediately stop using the vehicle or you
end up rebuilding the trans,your call,your money & lots of it

Ask yourself ---Why would changing the fluid do anything?

Old oil out / New oil in ?

You change trans fluid because it breaks down from the heat
That is it's job,to remove heat or your trans fails

Trans & Power Steering get changed every 3 years & not
over 30,000 miles ever on ALL Vehicles