98 chevy tahoe Z71 starts but will turn off after a 2 seconds

To disable the alarm system in a 2001 Chevy Tahoe, try the following steps:

1. Close all doors and windows.
2. Insert the key into the ignition and turn it to the "ON" position.
3. Within 10 seconds, press the lock button on the driver's door five times. The alarm system should turn off.

Note: The above steps assume that your 2001 Chevy Tahoe has a factory-installed alarm system. If it has an aftermarket alarm system, the steps to disengage it may be different.

There is excessive current flowing through the switch . It means that the wire after the switch is shorting out or the full current to the headlights is flowing through the switch and not through the relay. Check the wiring positions of the relays.

Usually the has to be replaced and make sure to clear all trouble codes

Check the catalytic converter dose not matter how much fuel you get in if it can't out

if its electric shift. its probly the shifter motor. start vehicle open the door listen 4 the shifter motor. 2 see if you can hear it trying 2 shift. if not thats what it is if you can hear it tryng 2 shift it mite be vacume lines

The door locks on my 1999 tahoe stopped working and I checked the fuse, which was fine. The problem turned out to be that the fuse for my cigarette lighter was bad and for some reason it also must be working in order for the door locks to work. Put in a new cigarette lighter fuse and the door locks worked again!

I have had the EXACT same problem with my 03 Chevy Tahoe!!! I have yet to find out the solution!? I cleaned all my grounds and changed my rear speed sensor along with bench tested my alternator! Have you found the problem? I would be very grateful if you could hit me back with an answer!! Thanks

1999 chevy tahoe security light goes on while im driving does
not seem to cause any problem

98 Z71 Chevy rear end will work on this. You may need to get a kit to install disc

DO some quick checks : fuel filter , fuel injectors (when was the last time you serviced the fuel injectors?) and last fuel pump ,hope this helps AJ