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Is the theft light on the dash lit ? If so turn the key onto the run position till the theft light goes out, about 10min. Turn key off for a few min. then start , hope that helps. If not have to have it checked for codes in the (BCM) body control module or the (PCM) powertrain control module !
Is there a light that says SECURITY somewhere on the dash? These cars are notorious for failing anti theft systems that lock out the starter. This link explains and offers DO IT YOURSELF solutions.
The SECURITY light is a common problem on GM cars. The key is not just a key, it also communicates with the ignition/lock cylinder, and then to the TDM (theft deterrent module) also known as the computer. When these parts dont communcate properly, the car thinks its being stolen and turns off the starter. The hard part is finding out which part is failing. Mechanics can use this to their advantage and change everything, running up a large bill. I have found that bypassing the system is the most cost effective method and you also never have to worry about the problem EVER again. Ive bypassed dozens of GM vehicles, and never had any issues after that. Here is a link that explains the problem and offers some solutions. http://vatspasslockpasskeysecurityhelp.yolasite.com/
Monte Carlos effected by Vats or Passlock security Failure that can be fixed by bypassing
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2005 Good luck, hope this helps. Any questions, please comment back.
Could this be a fuel filter thats clogging or is it electrical such as an Electrictronic Ignition Control Module ?
Wouldn't be a clogged fuel filter , wouldn't start any time ,even after sitting overnight . Morethen likely it's the ICM - ignition control module . But to make sure it's ignition related , run the vehicle till it stops then pull a plug wire an check for spark . No spark , ignition module .
check to see if the wire is broken for the passlock/passkey system in the ignition lock cylinder, its common for the copper wire to seperate inside the insulation, when you tilt the column it could have been pushing the wires together enough to touch inside the insulation
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