u0100 lost comm ecm pcm

[dracing70]

has anyone ever got this code before and if so what caused it u01000 lost com ecm pcm.

 

[dracing70]

figured it out

 

[GeneralTJI]

What was the deal for you??

I occasionally have gotten this code.. no real pattern to it... haven't seen it in quite a while but who knows if/when it will come back. Never caused any actual issues (other than putting the tranny into a mode similar to tow/haul)

 

[dracing70]

my fuel temp sensor was bad and some how some way this affected the tranny

 

[revedupforone]

U0100 code

My duramax recently threw a few codes U0100 lost com. w/ ecm/pcm module A.
P0700 trans control system malfunction
P0181 fuel temp sensor malfunction
P0116 engine coolant temp malfunction

I found a loose neg. cable at the left battery. Cleared the codes and that fixed the problem.

 

[jarheadhunter]

My truck is throwing up the lost comm ecm pcm and p0700 trans ctrl sys error.
I checked the negative battery cable thing and thats a no go. How do you test the fuel temp sensor.

 

[duramaxd]

anyone find another solution to this???

 

[GeneralTJI]

I tightened up the pins on the TCM connector and I haven't seen this since. Might be worth playing with, also may want to look at the main bale connectors.... (i also cleaned and re-grounded the wiring for the abs module- the grounds that run to the frame under the driver, at the same time as tightening up the TCM connectors)

Hope this helps,

 

[x MadMAX DIESEL]

I have these codes pop up. P0700,u0100, p0116, and p0113? Ill check all that was suggested here but does the p0113 help narrow it down??

 

[x MadMAX DIESEL]

well I figured out the p0113, I forgot to plug in my maf sensor lol. Plugged it back in and tightened up my loose pass negative cable (yes I thought it was odd too that the other guy had a loose neg cable). Will need to start it in the morning to check and see, too late tonight, ain't nobody got time for dat.