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 …

Dec 28, 2010 · Re: Check Engine Code U0100 Hello Restomod, Welcome to the forum! I am sorry to hear of the vehicle issue you've encountered. If you would like my assistance throughout the process …

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 …

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 …

Oct 6, 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 …

May 8, 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 …

Aug 8, 2022 · Fixing PCM communication error - no-crank & radio giving anti-theft code error

Jul 28, 2015 · Put a code reader on it and got U0100 (ECM\PCM communication error). After much troubleshooting, frustration etc., initially checking all of the fuses related to ECM, PCM, fuel, etc.

Mar 1, 2025 · Installed a ABS module: Now no start, no crank, code U0100 (loss of communication ECM PCM) 2007 cadillac srx awd 3.6 abs module code u0100 ecm pcm no start - no crank.

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 …