Security light comes on Chevy Colorado still starts but

before doing this check the body control module on the right side behind the kick panel to make sure is plug in all the way and clean.

If the security light is on, the problem is with the Vehicle AntiTheft system. The key with the chip is not being read in the ignition cylinder. Therefore the computer doesn't allow it to be restarted for 10 minutes.

Alternator will keep engine running when battery becomes disconnected through a loose or corroded connection.

put gas line antifreeze.

could have an air temp sensor going bad,it controls air fuel mixtures at different temp.I would start there.

Do you have a security light flashing in the dash when you try to start it, does the starter spin the engine for but not start it up? Have you tried spraying fuel into the intake during cranking? Do you have spark? Any fault codes? All this can be the problem and other things as well, have them all eliminated as the cause.

2006 colorado..security system keeps me from starting the truck , but not every time. i had a new key made but the security symbol pops up now and then too. can the system be turned off//

To many things that can cause the check engine light to come on. It could be as simple as a bad gas cap to a miss fire in your ignition system.
If there is an Auto Zone around your area, they scan for the DTC codes free of charge and when the issue has been addressed. The check engine light will reset if self after 3 consecutive start cycle if there is no oter issues.
Thank you for using fixya and good luck

Sounds like water getting in one of the connectors. You will need to see what fault code is in there when the light comes on, then look at that sensor.

No, it can not be disabled.
The theft system is indicating a short term theft issue.
Have you added any "after market" remote start systems or alarms?
If NO.
Insert the key in the ignition, turn the key to run position ( do not start ) and leave it in that position for 10 minutes. Cycle the key to LOCK position, count to 10, then turn the key back to run position and leave on for 10 more minutes. After the 10 minutes is up, repeat the procedure (1) more time and the security system will relearn the PASS code.
Give it a try and let me know.
Regards,