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Finally a cheap passlock fix!
CF Beginner
Joined: Mar 2023
Posts: 1
Likes: 0
2003 chevy impala 3.6L passlock help please
ok first off changing the ignition switch and tumblers will do absolutely nothing sorry if you have already done this. there are three main components to the passlock II system the passlock sensor, the BCM, and the Ecm and of course the wiring in between. Odds are if this keeps happening and there is no other problems such as door locks freaking out trunk release just goin off then it's not the bcm if you do the relearn feature and it works the it is also not the Ecm. so you are left with the 3 wires that run from the bcm to the passlock sensor.odds are the passlock sensor is bad. now there are two solutions either go to the dealer and have the sensor replaced or bypass the system for good. any respectable mobile electonics installer should be able to do this no problem it takes me about 20 mins and i personally charge 40 dollars to do so hope this helps also if you are mechanically inclined in electronics i can send a diagram on how to bypass it yourself hope this all helps
2003 chevy impala 3.6L Passlock ingaged every time I try to start it!
Please help. Just bought car. Previous owner said nothing about the passlock problem and now that im home with it i cant seem to start it without it going haywire. I am pretty mechanically inclined and can follow directions. If there is any help for me with this... please send me some info on what to do.
CF Beginner
Joined: Apr 2023
Posts: 1
Likes: 0
ok first off changing the ignition switch and tumblers will do absolutely nothing sorry if you have already done this. there are three main components to the passlock II system the passlock sensor, the BCM, and the Ecm and of course the wiring in between. Odds are if this keeps happening and there is no other problems such as door locks freaking out trunk release just goin off then it's not the bcm if you do the relearn feature and it works the it is also not the Ecm. so you are left with the 3 wires that run from the bcm to the passlock sensor.odds are the passlock sensor is bad. now there are two solutions either go to the dealer and have the sensor replaced or bypass the system for good. any respectable mobile electonics installer should be able to do this no problem it takes me about 20 mins and i personally charge 40 dollars to do so hope this helps also if you are mechanically inclined in electronics i can send a diagram on how to bypass it yourself hope this all helps
CF Beginner
Joined: May 2024
Posts: 1
Likes: 0
Diagram request for Chevy impala 2016 please
ok first off changing the ignition switch and tumblers will do absolutely nothing sorry if you have already done this. there are three main components to the passlock II system the passlock sensor, the BCM, and the Ecm and of course the wiring in between. Odds are if this keeps happening and there is no other problems such as door locks freaking out trunk release just goin off then it's not the bcm if you do the relearn feature and it works the it is also not the Ecm. so you are left with the 3 wires that run from the bcm to the passlock sensor.odds are the passlock sensor is bad. now there are two solutions either go to the dealer and have the sensor replaced or bypass the system for good. any respectable mobile electonics installer should be able to do this no problem it takes me about 20 mins and i personally charge 40 dollars to do so hope this helps also if you are mechanically inclined in electronics i can send a diagram on how to bypass it yourself hope this all helps
- I'm requesting the diagram you said was available to bypass the immobilizer (3 wire bypass from the bcm)
Super Moderator
Joined: Feb 2017
Posts: 6,207
Likes: 688
@Cshaw46
as you can see from the date, that person hasn't been here in FOURTEEN years. They won't answer you.
diagrams are here: https://charm.li/
as you can see from the date, that person hasn't been here in FOURTEEN years. They won't answer you.
diagrams are here: https://charm.li/
CF Beginner
Joined: Jan 2026
Posts: 1
Likes: 0
Passlock 3 problems
My email is keilafletcher17@gmail.com. I need to know how to take this apart and clean the contacts. Please someone help me
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Silverado, Sierra & Fullsize Pick-ups
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