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Passlock™ System
The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock™ System are as follows:
• The ignition lock cylinder and key
• The ignition lock cylinder case, including the Passlock™ sensor
• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The powertrain control module (PCM)
You can not by pass anything , system will not let vehicle start
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I had a problem on my 2006 sierra, the fan wouldn't work on 5. gm had a curtisy recall, they had to replace a resistor, at no charge, last week. Ask your dealer about any recall for this with your vehicle.
Turn ignition to on position for 10 minutes , do not crank it . Do this three times then turn key all the way off then your theft lock should be reset .
Be sure to make sure battery is fully charged or hook battery charger on low to maintain battery while doing this process
the evap system is the vapor control of gasoline in the fuel tank it runs the whole length of the truck involving a vapor canister and vent control valves and purge valves of course hoses also.
Common for the ignition lock switch it self has gone bad and will need to be replaced. This is more common if you have lots of keys on your your key chain, the extra weigh wear out the electrical sleeves in the cylinder walls making the passlock not to read the proper resistor reading on your ignition keys and needs to be reset all the time. My In-Laws had the same problem with there Grans Am and was at the deal once a year for it. Once the warranty ended I got the passlock 2 by pass for around $70.00. The factor alarm still works but the ignition immobilize was disabled so they would not get stranded out in the cold. Here is the link and good luck, keep me posted and it's just a plug and play so there is not wire cutting and splicing. Keep me posted and don't forget the rate. http://www.gmpasslock.com/
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