Question about GMC Yukon

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Got a aftermarket alarm, but the other day i was driving down the road and the security light came on,after i got home it was running fine.The next morning it wouldnt start till now it wont start.ive unhooked the battery and nothing.it turns on and off right away.i dont know what to do, people tell me is the factory alarm messing up.

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You then have a problem there, because this vehicle has a the PASSLOCK II key based engine disabling system, and currently it is engaged. Even if you have the black keys, they too would have stopped working.

A bypass is required to circumvent. If left unchecked, it will lock down the fuel injector rail (as it has now), and you will need to tow it in to GM for evaluation, and resetting.

But, if you want to just remove this system from the equation entirelly,
I suggest the PLJX bypass kit to get around this issue.

This Passlock Bypass Module is designed to momentarilly allow the engine to remote start by sending a proper coded pulse to open the fuel rail passlock injector cut off circuit.

The output from an alarm/remote starter would then shut down the pulse, once it has detected the engine has engaged, and preserve the integrity of the passlock system. That is it's designed purpose.

However, in your case, this input wire on the PLJX module, instead of going to a momentary ground pulse from an alarm/remote starter, would go to a constant chassis ground, through the bypass module, grounding out the PASSLOCK. The PASSLOCK would then always be bypassed as long as that wire is chassis grounded.

Check this LINK like reference guide for other additional details.

Hope helps.

Posted on Jun 03, 2010

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