Starts but stops in about 10 seconds - 2004 Porsche Cayenne

I don't work on these, but it sounds like an internal breaker for the motor. Motor old? could be pulling to many amps, gets hot and trips the breaker.

Disconnect batt for minute. Computer probly got shockd from an aftamarket part. If reboot doesnt work then git it scannd

what stops.
the engine
the CD./DVD
the heater.
what there are 3000 parts on the car, name one.
please.
what computer? name it , some jeeps have 10 or more computers on board.

check for loose wiring or a break in the wiring.

Check out the fuel pump

Check the fuel rail for water. If you have water there then the tank will have to be drained.

This is crazy but it works. When the security light is blinking and the motor will not start. The car thinks it is being stolen. Turn your key to the on position for 10 minutes without trying to start the car. Do nothing untill the security light stops blinking it will stop at the 10 minute mark. Then turn the key off for 5 seconds ,on for 5 seconds off for 5 seconds ,Then like magic start your car. When this stops working you have to replace the key module. Hope this helps.

u have to reset the PC car
first step .. try to start the car ,, and sure it will not start and the thefth system light will turuned on
soo keep the switch opened until the thefth system light stop .. it will take 10-15 min
switch it off for 10 seconds
again switch it on but without starting the car .. and wait for 10 min "not less than 10 mins,, if little more no problem" .. do the same thing one more time ..
finally switch it off .. wait for 10 seconds and start the car ..

ok are you ready, first turn the ign on but do not turn the key to the start position, the alarm should sound, as soon as the alarm stops sounding, count 10 seconds then start the vehicle,this will disable the alarm unless you set it with the remote, if that doesent disable it repeat above again it has to be 10 second count after alarm stops..

When you tur the key forward do you hear the fuel pump running? You should hear a low hum for about 20 seconds near the gas tank and then it stops. If you hear this your pump is good. If it keeps running or you can't hear it at all it's bad or the main fuel pump fuse is blown.