Having a transmission problem with my 04 GMC LB7 diesel Understand I should get some DTC in the TCM however have no idea how to read the TCM with efi. Read codes in ECM however none there, but some should be so what's happening here?
Novice User
Reading the TCM on an 04 LB7 - how to
Having a transmission problem with my 04 GMC LB7 diesel Understand I should get some DTC in the TCM however have no idea how to read the TCM with efi. Read codes in ECM however none there, but some should be so what's happening here?
Novice User
Connect to the AL5 TCM and read the codes.
~Erik~
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