Question about 1998 Plymouth Grand Voyager

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My Grand Voyager keeps getting codes P1776 P1784 P0700 goes into limp mode till they are took out

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Code p1776 is solenoid switch valve latched in low/reverse position. Valve is located in valve body not solenoid body. The possibilities are:
the low/reverse pressure switch itself is bad
the transmission control relay output circuit is open
the control circuit (sense) of the l/r switch is open, shorted to ground or shorted to voltage.
The control relay's output is on pin #6 of the 8-pin plug of the transmission (red wire); you could verify that the wire has 12V on it when you are idling (and I guess I would put it in gear with the brakes applied). Also examine/shake the wire for intermittent connection possibility.
The solenoid sense circuit connects pin # 8 (light blue) to pin #50 of the transmission control module. You could check that connection and monitor it for voltage to fluctuate between 0V and some measurable V when the trans is shifting normally, and to loose that fluctuation when it is not, which would verify the circuit is OK.
If that proved to be OK, then I would suspect the switch isn't responding and needs to be changed.
The solenoid box is removable after you drop the pan and remove the valve body, and so it would not seem to be an horrendous expense (compared to a rebuild). I haven't done this myself so I can't comment on doing-it-yourself.
I would try to find a competent independent shop that know the Chrysler trans and discuss it with them as to the cost of replacing the l/r pressure switch as the alternative

The code p1784 is about the switch that monitors the hydraulic pressure for operating the low/reverse clutch of the transmission. That clutch is called into play for all forward gears as well as reverse, so it seems reasonable if that clutch were not working that the car wouldn't move in any gear. I would begin by making sure that there is sufficient trans fluid by inspecting its dipstick. If needed only use ATF +4 but don't overfill it. Also, just on a chance, take a look underneath to see if you see any motion of either the left or right half axles (or one moving, but one not) which would be another reason for no motion due to a drive shaft disconnection or some such anomaly. Other than that, your problem could be with the Low/Reverse solenoid switch in the solenoid pack portion of the transmission (the box on the driver's side of the trans) being stuck. That can be repaired without removing and rebuilding the transmission so let us hope that may be the cause. I would have the car towed to a good independent trans shop that has a reputation for knowing how to service the Chrysler electronic transmission.

DTC code p0700 is a transmission control system (mill light) which is related to the other two codes mentioned above.

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By the sounds of it, you need a solenoid pack...its latched in LR position...if you haven't already tried to the flush the fluid and filter, (if equipped) then try replacing the solenoid pack...which is the module attached to the front of the transmission...un plug it change it and install new gasket....try that and repost if it gets better.

Posted on Nov 07, 2009

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found this on another page.....
Originally Posted by vasau viewpost.gif The vehicle came in with 2 trouble codes and complaint on a transmission shifting.
P1775 Solenoid Switch Valve Stuck in TCC.
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After clearing these 2 codes the van ran normal for about 20 minutes without any issue, but after, the problems came back with no codes.
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