Dec 28, 2010 · Re: Check Engine Code U0100 Laura, I am having issues with my 2006 DTS giving off the U0100 code and may need some assistance with my dealer in getting resolution of the matter. …

Feb 13, 2021 · This code U0100 popped up last week when I started the truck, but it drove fine. I do have an unlocked pcm with a Hemifever tune. Couple weeks ago i installed a new tune for my long …

Jun 21, 2024 · Hi Everyone, I have been chasing my tail for some time now and am hoping someone could shed some light on my issue. I have been searching through the forum with no luck as of yet. I …

Feb 2, 2019 · The truck never went into eco mode so I took it back home. I read the code and it was U0100. Letting the truck off for 3 hours the code is still there. Any of you had this issue? Truck is a …

Jan 31, 2026 · Hello all, I have a 2014 Ram 1500 3.6. While I’ve always had some minor electrical gremlins, the car was running okay. Now, it no longer cranks at all. I plugged in a scanner and got …

May 7, 2023 · The only code I got was U0100 which means no communication with ECM. Battery was fully charged during all of this and had the same results over many attempts. Eventually I jumped the …

Dec 17, 2013 · Code U0100 ECM Problem 1 reading Jump to Latest 14K views 7 replies 5 participants last post by CWB Nov 19, 2020

Oct 5, 2016 · Out of the blue, my mildly modded CTS-V did not start earlier this week. I borrowed a Tech2 today and am getting the following codes: U0100 Lost communication with ECM U0121 Lost …

Sep 28, 2022 · 2007 Escalade Having Communication Issues Vehicle Still Runs And Drives ! locks going on and off Gauges going crazy Slow acceleration Hesitant shifting ABS Light CEL Light …

Feb 16, 2025 · U0121 U0100 U11BC U1110 U0140 - this one, for the BCM, truck has had it for years, since being repaired after an accident, never poses a check engine or anyt issue, and it's last on the …