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To learn more of testing procedures shown in this video, go to www.scannerdanner.com This is a 2002 Dodge Caravan that is stuck in second gear. This is known as limp home mode or transmission limp mode. In this video I cover the following: How to test a computer controlled relay How to do a loaded circuit voltage drop test How to determine if a relay is power or ground side controlled. How to test for an open circuit Why the computer enters limp mode P0888 Flow Chart Transmission wiring diagram overview Transmission solenoid power Tools used - - Autel MS905 MaxiSys Mini Diagnostic System with Connector Kit - USA Version https://www.jbtoolsales.com/autel-ms905-maxisys-mini-diagnostic-system-with-vci-and-connector-kit-usa-version#oid=1014_1 - incandescent test light https://www.jbtoolsales.com/otc-3633-mini-circuit-tester#oid=1014_1 - Digital Multimeter https://www.jbtoolsales.com/atd-tools-5519-auto-ranging-digital-multimeter-with-protective-holster#oid=1014_1 For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!