2011 GMC Acadia NO CRANK NO START! U0100 Code & ECM Communication Problem

Is your 2011 GMC Acadia completely dead with a NO CRANK, NO START condition? In this video, we diagnose a frustrating starting problem and investigate DTC U0100 – Lost Communication With ECM/PCM. When a vehicle won't crank and your scan tool shows a U0100 communication code, there can be several things to check before replacing an expensive ECM/PCM. We'll walk through the diagnostic process and look for the cause of the communication failure. In this repair video, we'll look at: 🔧 2011 GMC Acadia no crank no start diagnosis 🔧 U0100 Lost Communication With ECM/PCM 🔧 ECM/PCM communication problems 🔧 Checking power and grounds 🔧 Checking fuses and relays 🔧 Inspecting wiring and electrical connections 🔧 Using a scan tool to diagnose the problem 🔧 Troubleshooting a GMC Acadia starting problem 🔧 Finding the cause instead of just replacing parts If your GMC Acadia won't crank, won't start, or has a U0100 code, this video may help you troubleshoot the problem and determine where to start your diagnosis. 👍 If this video helps you, please LIKE, SUBSCRIBE, and leave a COMMENT with your experience. It helps support Dad's Garage Productions and allows me to keep making automotive repair and diagnostic videos. Disclaimer: This video is for educational and informational purposes. Always follow proper safety procedures and verify diagnostic information for your specific vehicle.