My chevy 2500 has the security light on, and it will not start, its a standard if that will help. how do i get it to start back up?

I would just about bet a weak fuel pump. With a scan tool connected you can monitor your fuel pressure thru live data. Low fuel pressure will not set a check engine light except if the O2 sensors register a lean condition.

This is how you do a security system reset on an Impala. I hope you have the transponder receiver connected on the new column.

https://www.vehiclehistory.com/questions/how-do-i-perform-a-chevy-impala-security-reset-93585

Chevy Impala Won't Start Security Light - It Still Runs

https://itstillruns.com > chevy-wont-start-security-light-...
Make sure the security light is flashing. After 10 minutes the security light will stop flashing and either turn off or stay on steadily. When it does, then ...

How to reset anti theft system on a 2008 chevy impala - Fixya

https://www.fixya.com > ... > 2008 Chevrolet Impala
Sep. 1, 2019 - Turn ON the ignition, with the engine OFF. · Attempt to start the engine, then release the key to ON (vehicle will not start). · Observe the SECURITY light, after ..

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GOT SAME PROBLEM CHEVY DAURMAX DEISEL HD 2500 CHANGE FUEL FILTER AND OIL &OIL FILTER . WHEN YOU COME TO A STOP SIGN OR RED LIGHT IT HAPPENS .I PUT IT IN NEUTRAL AND PUMP ON GAS SO RPM'S STAY AT 1800 RPM'S

disconect the reverse light switch wires from the gearbox & bridge. If the lights come on it is a faulty switch.

Check out this link, should help you understand why that security light is causing this problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

replace the ground stap from the chassis to the engine on the passanger side lower part of engine

replace the ignition lock cylinder, that should cure the problem, but u will need to have the VATS module re-programmed to accept the new VATS key resistance value, this is preformed by the dealer only.

sounds like your engine immobiliser fuel cut off is activating.try taking battery teminals off,re-connect and re activate your immobiliser fob the usual way,**** it will re-set itself,& or your fob battery may need changing,it,s anti-theft cut off that is your problem.good luck.

Hi,

Often brake lights and signal lights not working indicates a loose grounding of the rear electrical assembly. Other indicators would be dim and/or all the lights light up (but dimly) when engaging the breaks or activating any of the turn indicators. A way to verify this is to hardwire another/external grounding wire to any of the metal receptacles of the bulbs straight to a bare metal/chassis of the vehicle.

Of course the standard procedure of checking the fuses, the harness connectors and the wire harness themselves still apply.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

that has something to do with the reprograming of your ingition key if you are having not starting problems i will recomend you to leave it alon but if you wnat to be in the safe side then call one of the mobile locksmiths guy or take it to them to see if the key has to be reprogamed, and try using only one single key for the ignition,
some time systems take a little be to reconigse a copi made key