Passlock problem

Tiny
SZALKUSKT
  • MEMBER
  • 2003 GMC SIERRA
Electrical problem V8 Two Wheel Drive Automatic 10500 miles

I have the padlock warning light on bright steady sometimes and the truck will take forever cranking then eventually will start. I will think the pass-lock system is the problem. What do you all do to solve this bypass it or replace something?
Do you
have the same problem?
Yes
No
Friday, April 16th, 2010 AT 11:19 PM

16 Replies

Tiny
BMRFIXIT
  • EXPERT
I would try resetting the system which can be done by doing a hard reboot. Remove the negative battery cable and hold it to the positive cable for 5 minutes and this will discharge the capacitors clearing the system memory and allowing the protocol to start over.

Here is a guide that can help

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let us know what you find. Run the codes as well.

Cheers
Was this
answer
helpful?
Yes
No
Monday, April 19th, 2010 AT 6:33 AM
Tiny
SZALKUSKT
  • MEMBER
On this particular truck the resistor stuff is inside the lock cylinder for the ignition. It is passlock II. 2003 sierra. The key is a normal key. There are no OBD2 trouble codes. Maybe changing the ignition lock cylinder is the fix I can't tell.
Was this
answer
helpful?
Yes
No
-1
Wednesday, April 21st, 2010 AT 1:00 AM
Tiny
BMRFIXIT
  • EXPERT
Ignition switch is more common to fail and need codes to conform suspicion

Try and do 30 Minute Learn Procedure

Turn ON the ignition, with the engine OFF. Attempt to start the engine, and then release the key to ON, vehicle will not start. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF. Turn OFF ignition, and wait 5 seconds.

Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes, the vehicle is now ready to relearn the Passlock Sensor Data Code and/or Passwords on the next ignition switch transition from OFF to CRANK.

IMPORTANT: The vehicle learn the Passlock Sensor Data Code and/or Password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password.

With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
Was this
answer
helpful?
Yes
No
+4
Wednesday, April 21st, 2010 AT 6:21 AM
Tiny
BMRFIXIT
  • EXPERT


http://www.2carpros.com/forum/automotive_pictures/99387_Graphic_65.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_711.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_325.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_Graphic3_142.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_Graphic4_63.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_Graphic5_38.jpg

Was this
answer
helpful?
Yes
No
Thursday, April 22nd, 2010 AT 7:10 PM
Tiny
SZALKUSKT
  • MEMBER
Thanks for the photos. I am wondering is the ignition switch separate from the ignition cylinder? Also, do you have a diagram relating to the procedures for removal of the components described in your reapair steps?
Was this
answer
helpful?
Yes
No
-1
Thursday, April 22nd, 2010 AT 7:32 PM
Tiny
BMRFIXIT
  • EXPERT
You have an ignition switch and ignition cylinder lock

Need special tool


http://www.2carpros.com/forum/automotive_pictures/99387_Capture1_5.jpg

Was this
answer
helpful?
Yes
No
-1
Thursday, April 22nd, 2010 AT 9:18 PM
Tiny
SZALKUSKT
  • MEMBER
Can I just install an ignition switch and try and see if it fixes the problem? Is the special tool for removing the ignition lock cylinder? Also can't you just use an allen key wrench or something to remove the ignition lock cylinder?
Was this
answer
helpful?
Yes
No
-1
Friday, April 23rd, 2010 AT 2:42 AM
Tiny
BMRFIXIT
  • EXPERT
Most common to be the switch and not the cylinder lock
Inspect closely the wiring harness too
You can use whatever available to you and make your own special tool knowing what it look like
Was this
answer
helpful?
Yes
No
-1
Friday, April 23rd, 2010 AT 6:47 AM
Tiny
SZALKUSKT
  • MEMBER
I finally did what you said by resetting the system on a reboot and it worked and I drove it but then it started doing it again. I think the security module is bad?
Was this
answer
helpful?
Yes
No
-1
Friday, April 23rd, 2010 AT 12:18 PM
Tiny
BMRFIXIT
  • EXPERT
Makes sense I have seen these modules go out.
Was this
answer
helpful?
Yes
No
Friday, April 23rd, 2010 AT 5:09 PM
Tiny
BMRFIXIT
  • EXPERT
The Ignition lock cylinder and keys do not contain any coded electronic components. The lock cylinder housing contains the coded electronic components. Changing an ignition lock cylinder or adding a key is a purely mechanical process which does not affect the vehicle theft deterrent system. To add a key, simply cut a new key to match the existing one. To change the lock cylinder, simply replace the existing lock cylinder with one of the same type
Was this
answer
helpful?
Yes
No
-1
Thursday, April 29th, 2010 AT 5:53 AM
Tiny
SZALKUSKT
  • MEMBER
I went to the dealer and they told me there is only an advisory or something that is 7yrs 70,000 miles for the module not a recall?
Was this
answer
helpful?
Yes
No
Saturday, May 8th, 2010 AT 12:11 AM
Tiny
SZALKUSKT
  • MEMBER
Took it to the dealer and when I took it in that night the light was not coming on anymore(padlock light) and they said they could not find anything wrong and it was hard starting and they tried to sell me a fuel press regulator, but I know for a fact the padlock light was coming on. Will there be codes stored if the light went away? I told them keep the truck until the light comes on for them.
Was this
answer
helpful?
Yes
No
Sunday, May 16th, 2010 AT 1:23 PM
Tiny
BMRFIXIT
  • EXPERT
Codes should be stored unless battery was disconnected or codes were cleared
Was this
answer
helpful?
Yes
No
Sunday, May 16th, 2010 AT 7:31 PM
Tiny
SZALKUSKT
  • MEMBER
Well, the dealer said the light was not coming on so all they noticed when they read the codes for the system and determined the security module (BCM) was bad. So I had it replaced and now everything works. ($650.00) Thanks for hanging in there will me, I love this site.
Was this
answer
helpful?
Yes
No
Sunday, May 16th, 2010 AT 7:44 PM
Tiny
BMRFIXIT
  • EXPERT
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers
Was this
answer
helpful?
Yes
No
Monday, May 17th, 2010 AT 7:55 PM

Please login or register to post a reply.

Recommended Guides