Truck starts and runs only a few seconds and shut down was told it was somthing to do with the key chip how do i tell

Sounds like it is running out of fuel. Maybe a bad fuel pump, or clogged filter. If it is carbureted, a stuck float valve or clogged float valve might be the problem.

Telling us year, make and model would allow us to help you more.

Just a shot in the dark. If your key has the magnetic chip in it, the chip may be week. Try another key if you have one.
We have a key without a chip in it we hide under the car. It will turn the ignition but will not crank(dealer told us that). One more thing the dealer who made the key told us not to try cranking the car with it because the car could think someone is stealing it and shut down till a dealer input codes to allow the car to run again.

the skim module needs programed at a dealer,it tells the security moduel the key code,if thay dont match it wont run ,thay charge a pretty penny for this service

the key may have a chip in it . it may be the wrong one in the second key

The Passlock system is notorious for failing. There are 3 different parts of this system that can shut down the car and activate the Antitheft security system. The problem will be one of these 3 things. The key. the ignition lock cylinder, or the TDM. The easiest one is the key. The key will either have a small black chip in the key shaft or a transponder hidden in the key head. If there is a chip, they are known for wearing down and not reading correctly. Try wiggling it, cleaning the chip with alcohol, and taking all other keys off the key chain because it pulls on the key and causes problems. If you have no chip and instead a transponded key, (it will have a little "+" sign by the plastic) you can try performing a relearn procedure. It goes like this.




1. Perform a security system relearn.
2. Let the vehicle sit for more than 10 minutes with the key off.
3. Attempt to start the engine, leave the key in the run position monitoring the security system indicator.
4. After 10 minutes, the security indicator will change state.
5. Turn the key off and wait 10 seconds.
6. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
7. After the second 10 minute timer has expired, turn the key off for 10 seconds.
8. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
9. After the 3rd 10 minute timer has expired, shut the key off for 10 seconds.
10. The security system will relearn on the 4th starting attempt and the engine should start and run.
If that doesnt work, you will need to start replacing parts. Like i said, there are 3 parts. The key, the ignition lock cylinder, and the Theft Deterrent Module (TDM). all of these are involved in the Passlock system and could be responsible for shutting down the vehicle. And trust me they are all expensive. I always share this link for this problem because there is so much information on there and will be helpful no matter what you decide to do. If all else fails, there is PERMANENT FIX for this problem. You can bypass all aspects of the system and never worry again. That is also on this link.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

I just wrote a repair for a guy to replace the passlock sensor, but it doesn't sound that extreme. Your key has a chip in it for the passlock security system, there are 13 different resistences for these chips. Make apsolutely sure the key you had cut, has the same coded resistence (eg. code 2 will turn the cylinder of a code 3 ignition, but will shut down in a few seconds.) If you have a code 2 key make sure you order a code 3 key before you have it cut. All 13 different keys can be cut to be able to turn in the ignition but only the right code will stay running.

Check your gas cap, I know it sounds weird but that causes a vacuum, also is your air filter on tight?

How did the Dealer tell you how to do it?

put you key near the ignition switch the key has a passive antitheft chip in it and the car senses it isnt there so it wont stay running the pcm detects it is being stolen so it shuts down. if the key is near the pick up it should read the key as being there

The 1st key cost more because they have to reset the cars security system to make it recognize the new key, once that is done is easy to do the 2nd key, thus less money for the second key.