What can cause low voltage on a vehicle?

a low voltage issue would be caused by the alternator not charging or a problem with the battery. That should be easy to figure out if in fact that is the problem. sounds like you may have some other issues here.

I do appreciate your response. I actually meant to indicate in my post that those problems had been ruled out. I did have my battery and alternator tested which showed them to be operating okay.

the catalytic converter's may have come apart causing a blockage in the exhaust.

What was the voltage with the engine running? What is the voltage on the battery now? Try some starting fluid to see if you have ignition.

Is your radio shorting out? I paid for this to find out about mine. $1,182.00 to change the power module, changed the alternator. And I told them in the beginning the radio kept shorting out. Guess what it was the radio. But the van was in a accident, rear hit. the body people told me there's a low voltage still. Haven't had any problems since radio change. 2010 Chrysler town and country, maybe I should trade it in.

I have a 2008 Chrysler Town and country and can't get past 10 mph and the check engine light is on what could be the problem and how do you know if your transmission is going in your vehicle