is my car misfireing when idoling

Question

My car runs fine but when its idling the engine seems to be misfiring. When in drive there is a low grumble coming from the engine. This grumble is a deep tone but loud and enough to shake the car. If its in park it goes away but in drive it comes back. The code reads U0073

Answer 1

U0073 Control module communication

The low grumbling has nothing to do with this code, what you have is a mechanical problem , If this was a diesel engine , you would even start, When there a noise in drive you have a transmission concern, If that noise is rhythmic (when in drive, foot on brake) the transmission is faulty,