Insane electrical issues

D

DD_CloutGod

New member
Aug 19, 2019
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I'm pulling codes U0140 U1041 and U0100 all loss of communication bcm ecm and ebcm I believe are what they are for ......I've cleaned all grounds ....checked harnesses ....all looks good only thing I haven't been able to do is actually fix it ..truck will run for 5-6 minutes then all the gauges drop out except for battery voltage ....sent it to a diesel shop near me for 6 MONTHS replaced bcm and programmed and tbcm .....told me they couldn't figure it out ...has anyone had a similar issue .....any advice on diagnosis thru means of probing pins etc. Would be useful because I don't have access to a fancy scanner
 
2004LB7

2004LB7

Well-known member
Dec 15, 2010
6,385
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follow these data lines and make sure they are sound
 

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2004LB7

2004LB7

Well-known member
Dec 15, 2010
6,385
1,748
113
Norcal
I'd start with the GMLAN, the Tan/black and Tan wires. especially the termination resistors at each end
 
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