2000 GMC Sierra Engine will not start

Tiny
LEEYOUNGKAN
  • MEMBER
  • 2000 GMC SIERRA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Security light will not stay on, as it should during the relearn procedure. I purchased a reman computer which I installed. The relearn procedure states the security light should stay on during an approximate 10 min wait, this is not happening, as light flashes continuously.
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Friday, November 5th, 2010 AT 9:22 AM

10 Replies

Tiny
WRENCHTECH
  • EXPERT
Did you have the computer programmed yet?
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Friday, November 5th, 2010 AT 9:32 AM
Tiny
LEEYOUNGKAN
  • MEMBER
Yes, computer was programmed by the rebuilder who gave me instructions of what I need to do to complete the process, which is the relearn process. I performed the relearn procedure per his instructions, but the security light just won't stay on as it should to indicate the learning process is working
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Friday, November 5th, 2010 AT 10:05 AM
Tiny
WRENCHTECH
  • EXPERT
Did you have a security problem with the old PCM?
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Friday, November 5th, 2010 AT 10:07 AM
Tiny
LEEYOUNGKAN
  • MEMBER
No, There was no security problem prior to this problem. I suspected the duplicate key, which was cut by a lock smith, however, I understand from the dealer, that there is no transponder in the key, therefore, this would not cause the problem.
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Friday, November 5th, 2010 AT 10:28 AM
Tiny
WRENCHTECH
  • EXPERT
That's true. It's leading me to believe there is a problem with the new PCM.
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Friday, November 5th, 2010 AT 10:30 AM
Tiny
LEEYOUNGKAN
  • MEMBER
OK, That's what I think also, and am in the process of getting another computer from the rebuilder, however, I just learned, that I need to run the relearn procedure not just 2 or 3 times, but sometime even 5 times to get the security light to stay on, and if it doesn't stay on the vehicle will never start. Does this make sense?
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Friday, November 5th, 2010 AT 10:46 AM
Tiny
WRENCHTECH
  • EXPERT
Partially. Your just repeating the 10 minute procedure 3 times. The light still needs to act the same way.

Here is the 30 minute procedure

30 Minute Re-Learn Procedure
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (vehicle will not start).
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds.
5. 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 learns 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.
6. Start the engine (the vehicle has now learned the Passlock√ Sensor Data Code and/or password).
7. With a scan tool, clear any DTCs if desired (history DTCs will self clear after 100 ignition cycles).
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Friday, November 5th, 2010 AT 10:50 AM
Tiny
LEEYOUNGKAN
  • MEMBER
OK, Will try the 30 min relearn procedure
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Friday, November 5th, 2010 AT 11:10 AM
Tiny
LEEYOUNGKAN
  • MEMBER
Did 30 min relearn procedure -- truck still won't start -- check for codes -- getting code p1361(Manufacturer specific). Do I erase and perform relearn again?
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Saturday, November 6th, 2010 AT 11:20 AM
Tiny
WRENCHTECH
  • EXPERT
No, you have another problem. The code is for "Ignition coil control circuit low voltage.

I'm giving you the flow chart for that code but I don't believe in that much of a coincidence. I suspect this has something to do with that computer you put in assuming you didn't leave anything disconnected in the engine.
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Saturday, November 6th, 2010 AT 11:41 AM

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