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  1. 2005 CTS 3.6L no crank, no start, no communication with ECM, U0100 …

    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 …

  2. Check Engine Code U 0100 | Cadillac Owners Forum

    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 …

  3. 2011 Ram 2500. No Crank. No Start. U0100 Code - ramforum.com

    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 …

  4. U0100 Code Lost communication with PCM/ECM - RAM FORUM

    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 …

  5. Car is Dead - Cannot Connect to ECM - U0100 - help?

    Oct 5, 2016 · Car is Dead - Cannot Connect to ECM - U0100 - help? Jump to Latest 40K views 27 replies 10 participants last post by payne Feb 14, 2018 P

  6. '07 Escalade communication issues U0073 & U0100 - Cadillac Forums

    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 …

  7. Code U0100 ECM Problem | Cadillac Owners Forum

    Dec 17, 2013 · I scanned and the only code I got was U0100 which is an ECM problem. I checked all fuses and even had my battery tested and it was good. Anyone have any other suggestions before I …

  8. U0100 code - RAM FORUM

    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 …

  9. Anti theft issue 2005 SRX 3.6 (Update new DTC: U0100...

    Jun 16, 2024 · Anti theft issue 2005 SRX 3.6 (Update new DTC: U0100 Lost communication ECM/PCMA. & U0700 TCM issue") Jump to Latest 5.4K views 14 replies 7 participants last post by …

  10. Installed a ABS module: Now no start, no crank, code U0100 (loss of ...

    Mar 1, 2025 · Hi everybody. I hope someone can help me. 2007 Cadillac SRX AWD 3.6 Just changed the ABS module and now no start - no crank. I put the code reader on the OBD and it came up: Code …