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Re: 2002 2500 HD Security & No Start
The security light flashing and running for a couple seconds and shutting down are definitely Passlock II failures---the system is not seeing the proper resistances in the key tumbler. The PCM shuts down the fuel injectors when this happens- that's why the engine shuts off. Many will suggest you replace or clean the tumbler contacts inside the ignition switch-- a differnt key does not help you becausew the resistor is built into the tumbler- not the key (used to be that way when there was a chip in the key- known as Passkey- but GM trucks never used the Passkey system)- so what I do when this happens is permanently bypass the resistors in the tumbler--I do a lot of remote starter installs- so it is the same thing you have to do then. There is a "box" you can buy for under $10 on Ebay that will handle all this- and you can "dial-in" your resistance value and never have this concern again-- I have done two GM Trucks this way- sure beats the $300+ repair bill-- anyway the only downside is that your theft deterrent is inactive-- but when was the last time you heard someone say-- Thank God my theft deterrent saved me from having my truck stolen!! It always is more of a PITA then a useful feature-- and certainly not a convenience.
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Automotive A/C Engineer with:
'95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone- blown head gasket
'92 Chevy Lumina Van 3.8L 264k miles
'86 GMC S-15 - 2.8L 154k miles
'86 Buick Park Ave 3.8L 199k miles- my daily driver
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles- my high school car!!
All but the Camaro and Firebird are white....
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