July 24th, 2015, 4:25 PM
Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: Engine and Powertrian
- Chevrolet Silverado 1999-2006 GMT800 How to Replace Alternaor
Step by step instructions for do-it-yourself repairs
Browse all: Engine and Powertrian
Finally a cheap passlock fix!
January 16th, 2016, 6:23 AM
#281
Newly Registered
Join Date: Jan 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
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
January 30th, 2016, 7:04 PM
#282
CF Beginner
Join Date: Jan 2016
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Yes diagram please
[U][U][/[QUOTE=mobileinstaller;133910]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 Sorry can't figure where I'm suppose to type at. I really need a diagram please
]
]
Last edited by Mcoon; January 30th, 2016 at 7:05 PM. Reason: Not sure where I'm suppose to put text
January 30th, 2016, 7:06 PM
#283
CF Beginner
Join Date: Jan 2016
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Help need diagram
[QUOTE=Mcoon;315836][U][U][/
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 Sorry can't figure where I'm suppose to type at. I really need a diagram please
]
]
February 27th, 2016, 9:34 AM
#284
CF Beginner
Join Date: Feb 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
2004 Impala won't start
OK Fuel Pump changed wire harness changed ran great for 3 weeks now back to the same problem will not start...Key does not have a chip As I am reading what in the world is going on with these vehicles...someone please help this is getting ridiculous and expensive All work done by our mechanic....I keep seeing this pass lock issue well as far as I know there is not warning light unless I do not know where it is...the engine light stays on though...Why is GM not seeing a real issue with these and doing a recall actually had a recall for the key and all they did was grind on the key on both sides well that allows the key to come out before it is turned off running the battery down...now using a key that was not altered and it works fine...
March 25th, 2016, 4:22 PM
#285
CF Beginner
Join Date: Mar 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Wire bypass
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
April 16th, 2016, 2:04 PM
#286
CF Beginner
Join Date: Apr 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
I have a 2001 savana 3500 the fuel pump,ignition switch, lock cylinder case have all been replaced. Fuel preasure tested also purchased New Rockies bypass not starting problem still exists. After talking out the bypass I still had the tdm/passlock module still unplugged I tried to start it and it starts and runs great. I'm at a total loss as to how this is possible.
April 28th, 2016, 8:04 AM
#287
CF Beginner
Join Date: Apr 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Hell guys I have a problem similar to the one you are describing. The truck starts up but then dies after a second or so, however I don't get any flashing security light.
I have replaced the passlock module and did a relearn as recommended in alldata, but that did not solve the problem.
Could be this a passlock problem or should i start looking somewhere else in the truck?
Thank You.
I have replaced the passlock module and did a relearn as recommended in alldata, but that did not solve the problem.
Could be this a passlock problem or should i start looking somewhere else in the truck?
Thank You.
April 28th, 2016, 11:37 PM
#288
CF Active Member
Join Date: Jul 2015
Location: SE Michigan
Posts: 173
Likes: 0
Received 0 Likes
on
0 Posts
Welcome to the forum!
May 14th, 2016, 2:32 PM
#289
CF Beginner
Join Date: May 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
2001 tahoe
I have the same issues and have done all the resets I have seen could you please send me instructions on how to remove ignition switch and clean contacts or any wiring diagrams to repair or bypass this crazy thing I do not need it and all it is to me is trouble! Thank you
UPDATE: Did the below fix almost a year. Started acting up again about a month ago. Security light always coming, have to wait 10 minutes for passlock reset (almost every day). Had the below fix done again about a thousand miles ago. Works absolutely perfect again. No securit light, starts every time. My mechanic showed me the contacts, and they were badly burned again. He took a dremel with a brush and cleaned them like brand new. I think the problem is GM using inferior metals. Also had to fix my service traction control by cleaning the contacts by the wheels, more than once. Hope this helps someone else, sure has helped me.
May 19th, 2016, 10:21 PM
#290
CF Beginner
Join Date: May 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
06 Silverado
I'm happy things work normal now. I've been using my remote starter for 2years because
i kept getting passlocked out, and having the security on when i drive probably 75% of the time. What you're saying is the key switch has nothing to do with the passlock system at all?
i kept getting passlocked out, and having the security on when i drive probably 75% of the time. What you're saying is the key switch has nothing to do with the passlock system at all?