Duramax Diesels Forum Truck of the Week
  #1  
Old 11-15-2007, 03:44 PM
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Default Emergency Relearn on ECM works on LBZ

Someone left me a message that they got there truck started. Here is how you do it in case anyone every needs to swap ECM's

Try to start it, then turn the key back to run. DO NOT TURN IT TO OFF.

Wait 11 minutes (time it).

Try to start again, then turn key back to run. ditto.

On the third cycle, it will ignore the VIN differences in the various modules and will start.

This is how you get a busted truck on the side of the road running when you fry the PCM. You put in a PCM from any other truck of the same type engine, and go through the procedure.

A Tech2 can do the same thing in 1 minute instead of 30 minutes.

Quote:
Originally Posted by Cougar281 View Post
OR.... Fire up your scan tool, connect to the ECM, activate DVT select "Learn Now" under "VATs Relearn".

If for some reason that doesn't work, and you need to go through the long relearn process and can flash your ECM, go to G0302, change it from 600 seconds (10 minutes) to 10 seconds, so it'll be:
Turn ignition on
Try to start (it won't)
Leave ignition on.
In 10 seconds exactly the SECURITY (lock) light will turn off.
Try to start (it won't)
Leave ignition on.
In 10 seconds exactly the SECURITY (lock) light will turn off.
Try to start (it won't)
Leave ignition on.

In 10 seconds, the light will go out, and it will start up, and will "marry" the ECM to the BCM permanently.
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Old 11-15-2007, 03:57 PM
BIG DIPPER BIG DIPPER is offline
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Good to know......
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Old 11-15-2007, 03:58 PM
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just to be clear... is this turn to start ( as in crank it) then release and let it sit in the "run" position and let it sit?
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Old 11-15-2007, 04:07 PM
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Quote:
Originally Posted by tinman22 View Post
just to be clear... is this turn to start ( as in crank it) then release and let it sit in the "run" position and let it sit?
Yes, you try to crank and then release it to the run position and let it sit.
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Wendy 06 GMC LBZ CC/SB EFI "Rat Posion", Sun Coast trans, SC 1057 & Transgo JR by MikeL, true downpipe, Banks Ram-Air SD sleeves 12.50 @ 107.51


Big Blue04 GMC LLY 3500 SRW CC LB 4x4 DA Big Blue 13.12 @ 103.93 466RWHP/928TQ. PPE LLY extreme tune, VA Box, SC III by Inglewood Trans, 4" straight pipe, Super Diesel Tie Rod supports and Manifold, Trippin Pickup, Cognito Braces, FuzzyDice.

McRat's toy-2005 GMC "Casper 2" 2500HD 4wd Xcab SB Mike L. LLY 2 trans, McRat tuning 10.59 @ 128.9


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Old 11-15-2007, 04:09 PM
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DOH!!!

While I have done this with LLY's and LB7's, when I tried an LBZ it appeared not to work.

I guess I must have done something wrong.
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2004.5 GMC 3500 SRW LLY "Big Blue" - LLY O/S 1668. 13.12@103. Powered by PPE/VA with Mike L Suncoast Trans.
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Old 11-15-2007, 04:18 PM
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Good info
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Old 11-15-2007, 04:50 PM
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cool . good to know in case of an oops
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Old 11-15-2007, 08:05 PM
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Kat,
That procedure will definitely work on your Corvette as well. I did that with a PCM swap on a Z06. You typically wait until the "service engine light" flashes, which is just over 10 minutes, so your 11minute delay works. Third time it runs....
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Old 11-15-2007, 08:13 PM
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Kat, can we make this a sticky??

I'm sure it's going to come up again!!
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Old 11-15-2007, 08:16 PM
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Quote:
Originally Posted by LBZ View Post
Kat, can we make this a sticky??

I'm sure it's going to come up again!!
Done
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Blue Meanie 02 Z06 11.36 @ 120.67 448 rwhp/411 tq AFR H/C

Wendy 06 GMC LBZ CC/SB EFI "Rat Posion", Sun Coast trans, SC 1057 & Transgo JR by MikeL, true downpipe, Banks Ram-Air SD sleeves 12.50 @ 107.51


Big Blue04 GMC LLY 3500 SRW CC LB 4x4 DA Big Blue 13.12 @ 103.93 466RWHP/928TQ. PPE LLY extreme tune, VA Box, SC III by Inglewood Trans, 4" straight pipe, Super Diesel Tie Rod supports and Manifold, Trippin Pickup, Cognito Braces, FuzzyDice.

McRat's toy-2005 GMC "Casper 2" 2500HD 4wd Xcab SB Mike L. LLY 2 trans, McRat tuning 10.59 @ 128.9


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Old 11-16-2007, 01:39 AM
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LOL ears burning Kat lol.

first ecm didnt work guess no vin in it,
Turn key to run wait 11 min's,after that turn key of for split second then right back to run postion dont try to start wait 11 mins again or til the security light goes off in left corn of cluster,after that 11 mins turn key off for 3rd and last time for split second and back to run do not try starting wait 11 mins last time after the 11 mins or light is out turn key off the try starting, truck will start and run, if you check vin with efi live v2 will read the wrong vin but all runs great.

Thanks
Kat and Pat
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Old 04-28-2009, 11:12 AM
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Quote:
Originally Posted by Kat View Post
...This is how you get a busted truck on the side of the road running when you fry the PCM. You put in a PCM from any other truck of the same type engine, and go through the procedure.
so another OS can be installed without a reflash? I didn't think this was possible.
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Old 04-28-2009, 03:10 PM
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When I did the swap it worked for me,I bought the extra ecm from the diesel place and it was another OS then mine and truck started up after I did this.
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Old 04-28-2009, 04:21 PM
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Good to know! Thanks
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Old 04-28-2009, 06:53 PM
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A little OT here....but...
This same (30 min) procedure works on a Saturn ION when you have to replace the ignition switch. The only thing I'll add is that you have to turn the key off after the last 10 cycle before you start the car. If you don't you have start all over again.
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