Duramax Diesels Forum Truck of the Week
Old 07-06-2018, 05:25 PM
Perseverejd Perseverejd is offline
Join Date: Mar 2018
Location: Nj
Posts: 7
Default 04 6.0 to lb7 swap problem class 2 data

So ive swaped a lb7 in a 04 2500 hd
Finnaly figured out my shift problem [ shift solenoids)
The only problem i have left is efi live wont read live data or tune it will give me trouble codes and conect that much.
But data also cuts out as far as shift selector
Ive taken voltage readings at the splice pack all i get is .435 most everywhere. Also have taken readings at tcm ecm no 5v on data line . 5v ref wire has 5 v the sensors ive checked have 5v. Just not data engi e runs great. I dont get it any ideas?

Last edited by Perseverejd; 07-07-2018 at 06:35 AM.
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Old 07-12-2018, 12:51 PM
Kriesel Kriesel is offline
Join Date: Apr 2013
Location: Afton, MN
Posts: 16


Do you know if you wired the twisted pair for the obd port, and if you switched around the yellow wire for the transmission wiring? I can get pictures if needed, but if you have no idea what I'm talking about, then you may need to conduct these wiring projects first.
Kriesel's Diesel Suburban
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Old 07-12-2018, 01:43 PM
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rfletes79 rfletes79 is offline
Join Date: Mar 2010
Location: Galt, Ca 95632
Posts: 450

Have you tried pulling the radio and info fuse?? Then try reading/flashing....

1970 Chevelle Duramax Hot Rod, '04 LB7/TH400-gear vendor, HTT 67.7 FMW, Wagler street intake, 65% S&S sticks, exergy 10 mil pump, SoCal AF3388, Valve springs, Push Rods, LBZ rods, cut LB7 slugs..... 9 sec cruzer :-)

2002 2500HD LLY 6 speed ally conversion
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Old 07-13-2018, 09:20 AM
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BlkMax BlkMax is offline
Join Date: Aug 2008
Location: Wasilla, AK
Posts: 691


After having issues with locking multiple LB7 ECM's, I have gone to removing the ECM's and using a bench harness for all LB7 ECM flashing. I got tired of having to send the ECM's back to SoCal, and have NEVER had an issue with a bench flash.

I got my bench harness from https://www.eficonnection.com/ There is also a way to make your own harness if you are savvy and don't want to spend the extra $$.
Black Max....

Black Max, the fun truck:
'03 2500 4x4 CC/LB
Bent Rods, now under construction, its time to put all the saved up parts in....
Special thanks to Pat & Kat McSwain, MikeL, Guy, Trent, and others from here-thank you for the great ideas!
EPR triples

Emma, my DD:
'04 2500 4x4 EC/SB
HTT T4 366 74 .91, 65% SAC's from LDS, Trans Kit from Evan, tunes by Zach at Starlite
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