Okay, from what I've read, this is a fairly common issue, but I don't see any definite fixes. I'll try to give the whole story here. I got vehicles mixed up in my first post...it's a 1999 caravan, not a 2000. I've changed the filter and refilled with +3 fluid (Valvoline)within the last 5,000 miles for this problem, but up until now it's been very intermittent. Recently however, it's been setting a fault on just about every long trip. I've checked resistances from the TCM connector through the speed sensors, and also each solenoid in the solenoid pack. I didn't have any limits for the sensors or solenoids, but everything seemed consistent. All the connectors are now clean, and the harness also checked out ok - no opens, or shorts to ground, as far as I could tell. I also checked the ground pins in the 60 pin connector to ground, and that seemed okay too.
I can tell when it's going to fault when, after driving at highway speeds, it downshifts very hard as I'm approaching a light or stop sign. This hard downshift occurs between 3rd and 2nd gear. It will then stay in 2nd, set the CEL light, and will be sluggish when accelerating, probably because it's stuck in 2nd gear, and not in 1st. I understand this is just "limp home", or a fail safe mode that can usually be reset by shutting off and restarting the van. However, it will immediately fail again unless I let the van cool down. Since the fault relates to the L/R solenoid, I have a new solenoid pack on order. I've read in various places that there's a filter screen in the pack that can plug up. When the pack gets here and gets installed, I will try to update the results after driving the van awhile. Any other ideas or advice will be appreciated.
A question for Master Tech...is the valve body you referred to and the solenoid pack the same thing?
Last edited by sjwoody; 07-20-2009 at 01:54 AM.
Reason: added a question