Air Pollution specialist and new to the forum

I've spent most of a career in the field of air pollution control, both stationary and mobile sources. I can tell you how the emission controls work and how much cleaner tailpipes have gotten over the past 30 years. But the engine controls have gotten complex too. I'm hoping to learn about troubleshooting in this group. I've learned some important things about testing for good grounds, and how modules communicate using variable pulse width modulation on a data line. I hope to be able to solve a difficult communication problem with my 07 CTS that won't start. Marty

Welcome to the community Marti.
Thanks for introducing yourself

Good to have you here Marty the more expertise we gather from all fields the better.

Welcome aboard Marty