Electrical Issues? Here’s What Code U0073 REALLY Means!

In this video, Zach breaks down everything you need to know about fault code U0073 – Control Module Communication Bus “A” Off, explaining what the code means, what symptoms you’ll experience, and what typically causes it to appear. He covers how this code indicates a loss of communication between one or more control modules on the vehicle’s CAN Bus network and why it can lead to multiple warning lights, intermittent electrical issues, or complete system malfunctions. He also walks through how to properly diagnose U0073 by checking for loose or corroded connectors, damaged wiring, or failed modules that are disrupting communication. Finally, he explains the best repair steps to isolate and fix the root cause—whether it’s a wiring repair, module replacement, or connector cleaning—so you can restore proper communication across your vehicle’s network and clear the code for good. Tools we recommend having for your vehicle at all times: OBD scanner: https://amzn.to/3OIM7Wl Air compressor: https://amzn.to/48gnZ3W Battery charger/jumper: https://amzn.to/4bN2jQe Electric ratchet wrench: https://amzn.to/3wfG2u1 Dewalt flashlights: https://amzn.to/42G6edd Flex-head ratchet wrenches: https://amzn.to/3SydrHM Grease monkey disposable gloves: https://amzn.to/3wghbX7 Magnetic pick up tools: https://amzn.to/3uwT0D4 Rollet seat: https://amzn.to/3up8QzN 8020 Automotive Website: https://8020automotive.com/ Check Out Our Portfolio: Tuning Pro - https://tuningpro.co/ BMW Tuning - https://bmwtuning.co/ Diesel IQ - https://dieseliq.com/ Chevy Trucks - https://chevytrucks.org/ Porsche Mania - https://porsche-mania.com/ Muscle Car Club - https://musclecarclub.com/ New Videos Every Week. Subscribe so you don't miss a video! ►Subscribe Here: https://bit.ly/3xtNUph --------------------------------------------------------------------- What is 8020 Automotive? 8020 Automotive owns and operates a portfolio of content websites and eCommerce stores in the Automotive industry. We provide over a million monthly readers with high-quality automotive content, focused predominantly on technical and performance modification guides. --------------------------------------------------------------------- 00:16 – What Does a U0073 Stand For? 00:25 – What Are Control Modules in a Vehicle? 00:55 – What Does U0073 Fault Code Actually Mean? 01:30 – Signs & Symptoms of a U0073 Engine Code 02:20 – Most Common Causes of a U0073 Engine Code 03:22 – How to Diagnose & Fix DTC U0073