Hi all!

I have a buick lucerne model 2010 3.9 v6.
the check engine indicator is on and I received the following errors:
p0700 transmission control module ( tcm ) requested mil illumination
ECM U0140 Lost communication with body control
uo121 lost communication with antilock brake
ECM U0101 lost communication with transmission
ECM U0073 control module communication bus off
ECM p150c

when the errors are shown, all the control panel indicators loosing their balance and going up and down. In addition, the t/c and abs lights also going from on to off mode.

when I reset all the dtc'* with the tech 2 device the vehicle function is normal, after a short time all the errors start again.

Thank you all for your help

Unfortunately, to diagnose this, you need a top tech, who is good with a Tech II, has access to wiring diagrams, and can trace circuits.....

I seem to remember a tsb about if you disconnect/lose grounds to the bcm, you can fry the BCM, while it is still getting power.........

Since you have a Tech II, when the codes set, see if you can communicate with the affected module(*)......you set codes to a module, if you lose power, ground, or a data line to the module, and also if the module itself is bad.........it can be a time consuming diagnosis, especially if an intermittant problem, in one of the data lines(can be a grounded data line, or an open......can also be a bad junction connector....that'* where a top tech in circuits is needed.....