2001 Chevy 2500 passlock booboo

Do you have a starter kill relay installed? It sounds like you may have an issue with that. If you dont get a security light with the key in and in the on position then your truck should be able to start. And since you say it starts with the remote starter, then the passlock must not be fried. If you really want to know if your car is ok, re-connect the passlock wire and the starter wire if you installed a starter kill relay and then try to start the car. You may just have made a brain fart when typing the 5.04 vDC, but the passlock is measured in Ohms. J Rilla

Owner/Installer

What may have happened is that you fried the portion of the passlock system that is in the key's cylinder. Just to clarify, you cannot start the car with the key but you can start it with the remote start?Certified Security Specialist

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I don't have a starter kill relay installed as far as I knew I didn't need to do this. But it looks like I don't know much either. It did measure 5.04 VDC with the 555L connected, this is measuring the yellow wire to ground. on DC voltage.  Just to confirm I cannot start with the key but I can start with remote start, right now I go everywhere 24 minutes at a time, once the remote starter times out the engine dies. but one other thing is while the remote starter has the truck running I can turn the key to start and it will engage and grind the starter. Also even with everything removed and connected like before I started this project It will not start with the key and I don't get a security light. at least I don't think I did I will try disconnecting and check for security light. I am so confused. I appreciate all the help.

ok, after disconnecting the 555L and with the yellow wire cut I measured .903 K ohms. Red lead on the key side of the cut yellow wire and black lead on the ORANGE / black wire. Of course I cannot start the truck with the key but, I measured this with the key on the on position and got .903K ohms and started the truck with the remote starter and got .903K ohms. What does this tell us?

I took these measurements with a Fluke 787 Processmeter. Just to ensure ya'll I am using a good meter.

Try this, ground the negative input ( I think it is the blue/black wire coming off of the 555L going to the alarm's 2/3 ignition output) to activate the 555L and then try starting the vehicle with the key and see if it will start and run for longer then the remote start time out. If this works then you could at least use it temporarily.Certified Security Specialist

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Still can't edit, where are you located at? I found a junk yard bcm for $100 here in Arizona.Certified Security Specialist

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I am in gillette, WY.....Do you think it is my BCM or is it something that the dealer needs to reset?

It sounds like there is something seriously wrong if your car is only running for the preset runtime. Once the car has started, you should be able to put the key in and take over. The passlock only shuts down the car if it doesnt see the proper resistence when starting the vehicle. you can cut the yellow passlock wire after the car has started and it will keep running (you will throw the theft light on, but it will keep running. So since you say it will only start with the RS, and wont stay running longer than the RS runtime, then it would seem to be a problem with the key not powering an ignition wire. Wait though. Do you drive the truck like this? i mean do you remote start and then put the key in and go driving around and hope to get back before the runtime expires? if so, that would seem very weird unless you did not hook up the brake input from the starter, since the RS should turn off the first time you hit the brake to shift into gear. OK, so here is something to try. Test all of the wires in you ignition harness that you connected the RS wires to. But test them like you did before installing, by testing each one with the key in the acc position, then the on position, then the start position. If they all test as the should then there is likely no simple reason for the key to not be able to keep the engine running. You might want to put a 900 Ohm resistor across the yellow and ORANGE / black wire for testing. Unless you just ground the bypass input wire like mentioned above. This is just a thought, but it almost sounds like one of the connectors in your ignition harness is disconnected. This would explain why the key wouldn't start the vehicle, as well as why you dont get a security light with the key, and also why the key wont take over the engine after a reomte start, but of course in order for you to be able to drive it around, you would have to have disconnected the brake input. At this point you need to check every little detail. Check the obvious things that you have said in your mind, "well I know that cant be the problem, so I dont need to check that". And also a complete recap of everything in great detail would really help. I am sure you have mentioned everything, but it is in bits and pieces throughout this thread so it is more difficult to piece together. J Rilla

Owner/Installer

It sounds to me like you have damaged the ignition cylinder part of the Passlock system. To check it turn your ignition switch to the on position. Measure the voltage on a 12 volt DC scale. You should get a reading of 5 volts. Measure the voltage by pacing your black meter lead on the ORANGE / black wire and the red meter lead on the yellow wire. Start the vehicle with the remote starter and remeasure the voltage once again. Measure to two decimal places. ( example 3.86 volts) Now try and start the vehicle with the key. If it doesn't start DON'T turn the key off. Leave it in the on position. Measure the voltage again. The voltage MUST measure the same as when you checked it after using the remote starter. If it doesn't then the Passlock part of the igntion switch must be replaced. If the yellow wire doesn't measure 5.00 volts with ignition on then the BCM may be damaged. The integrity of your wires (ORANGE / black and yellow) must be perfect. Any resistance created by poor connections must be corrected. The BCM uses the voltage signal on the yellow wire as the value to allow the vehicle to start or not. I would strongly recommend you get your vehicle to a GM dealer somehow or another. Once there you should completely disconnect your remote starter from any ignition and Passlock wiring. The dealer will charge you to do this before they can check and repair you vehicle. You CANNOT just drop in another BCM into your vehicle. The part must be the correct one and IT MUST be programmed to the software and options your vehicle has. YOU can't do this without access to GM programming available only to GM dealers. You also require a GM tech II tool to read the vehicles software/options configuration to give to the GM computer. The tech II is then used to reprogam your vehicle's new BCM. The Passlock system then must be reprogrammed. If you take your truck to a qualified technician he should be able to quickly determine the problem and repair it because he has the proper tools to do so. Trust me I know,because I am one. Just because the truck runs with the use of your remote starter doesn't mean the BCM is getting the right info it needs. These systems can't be repaired easily and require a professional. Good luck.sparky