Question about Chrysler Town & Country

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2001 Chrysler Town & Country LXi. 88k miles Transmission Problem: History Properly working transmission had oil change by evacuating from oil pan, 4 quarts refilled Dextron4. 1k mile trip (NY to VA Beach). Two weeks later, in normal traffic, an abrupt noise and bang. Check Engine light comes on. Car limps home slipping whenever stopping for a traffic light. Managing the throttle allows operator to make it home. When starting next morning, transmission seems to engage normally. With brake depressed, can attain stall speed of 2,200 rpm, same in reverse. After driving a short distance (100 ft), stopping, placing in reverse (doing three point turn), slippage occurs and a noise occurs; whinning, like an aerated power steering pump, but more metalic. Next day, starts, drives, goes through all gears while subject to light to moderate loads. Starts off from stop signs normally; no mechanical or pump noises, appears to shift normally; driven 1.5 miles. However, after placing in reverse to turn around, slippage and noise starts, then slips in drive, noise is notable in neutral as well. Shifting from (slipping) drive to neutral, engine rmp drops in neutral as if under some load. Fluid level proper, fluid condition good. No evidence of granular clutch material suspended in the fluid or burnt fluid. Oil pan then removed, filter can be blown through with breath in reverse direction without important restriction. Filter appears properly seated, is original, and it appears the pan has not been removed before. No debris in oil pan, magnet has normal build-up of metalic paste. Stored Codes in order displayed: P1782, P0733, P1787, P1784, P0732, P0700. No diagnostic pressure tests performed.

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  • arotondiny Sep 10, 2010

    Each of the trouble codes are defined by the manufacturer, as has been done in the reply. These had already been decoded. The symptoms, of course tell a story, and need interpretation by an expert in transmission diagnosis with Chrysler experience. Therefore, it will be necessary to seek additional experts; thanks for the attempt.

  • arotondiny Sep 10, 2010

    Each of the trouble codes are defined by the manufacturer, as has been done in the reply. These had already been decoded. The symptoms, of course tell a story, and need interpretation by an expert in transmission diagnosis with Chrysler experience. In the absence of a Chrysler diagnosis manual that describes theory of operation and hydraulic diagrams for each function I am unable to determine the problem without further disassembly. I will resist an opinion of the problem so not to bias the answering expert. I am not interested in parts changing until the problem is fixed, and I do not wish to remove the transmission unnecessarily to explore when the problem may be correctable in place.

  • arotondiny Sep 10, 2010

    That would not explain the ability to attain stall speed on the torque converter. Nor would the ability to drive the vehicle cold as explained above coincide with this possibility.

  • arotondiny Sep 12, 2010

    Could be, but since the transmission removal is required to examine that possibility, it seems more sensible to gain as much information as possible from the outside through dynamic testing (through operation of the transmission). The fault codes stored provide a sequential event history, even if they are vague and therefore not conclusive evidence. To me, this problem has more the appearance of a control device failure rather than catastrophic pump failure, although I must admit the pump sounded very unhealthy during certain times as explained. There are electro-mechanical control devices in most modern transmissions, which I expect must not only work, but work together and not conflict in the control operations they perform. It they do conflict, I wonder what happens to the oil circuits that are served. I find it telling that the problem was precipitated by being placed into reverse on at least two occasions, when the transmission had started out working normally until being placed into reverse. The first time (as explained originally) this occured within 100 feet of operation - clearly insufficient time to significantly elevate oil temperature as it is drawn from the pump. The matter of the rpm drop when being placed into neutral from drive, when being in drive was producing no engagement (as in slipping) is indicating that there was an abnormal load in neutral. Why? This is also very telling.



    To gain more information, I decided to refill the transmission which had been drained and examined as originally explained. I had earlier installed a new filter when I had removed the oil pan, even though it does not appear to play a role in the problem. I rented a Code Reader from Autozone and cleared the existing trouble codes. I will then perform the same basic operational tests: drive engagement, stall speed and operation in forward drive carefully and strategically thorough all gears, to discover the result. When the Check Engine light comes I will compare the sequence of events to the first recording. I will also perform this operational test in reverse.



    It should be noted that the first time the transmission failed, the operator of the vehicle, a family member, wanted to get home and managed the accelerator to accomplish that goal. This time the conditions that the transmission will be exposed to will be more carefully controlled in the hope of gaining additional information.



    Also note, in order to be scientific about a diagnosis, I have not attempted to change more that one thing at a time. I noticed a multiple conductor terminal block going into the transmission, which must be involved in some control and monitoring functions. I will wait to disconnect and examine the quality of the connections until after this test, erase any set codes and repeat the same operational test if necessary.



    At this point, I am going to get a Chrysler diagnosis manual in order to understand the construction of the transmission and control device roles. I intend to avoid removing this transmission in a driveway to discover it was not necessary, or turn a repair into a transmission overhaul. The results of these tests will guide that decision.

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  • Chrysler Master
  • 6,826 Answers

There is most likely a broken pump gear,or a drum that has broken,the will need to be gone into,removed and took apart to find witch of these is the problem,a overhaul at a transmission shop is your best option to get a good warranty,and then look at the reasons why this happened and have it corrected so it does not happen again.

Posted on Sep 10, 2010

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  • Chrysler Master
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The flex plate on the back of the torque converter has split across the fixing bolts to the crankshaft ,hence the noise as well

Posted on Sep 10, 2010

  • Colin Stickland
    Colin Stickland Sep 12, 2010

    sorry a bit beyond me here ,as mainly manuals here in this country but i still think torque converter or the drive plate ,best of british with it anyway

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  • Chrysler Master
  • 2,019 Answers

P0700 Internal TCM
P0732 Gear Ratio Error in 2nd
P0733 Gear Ratio Error in 3rd
P1782 2-4 Pressure Switch Sense Circuit
P1784 L-R Pressure Switch Sense Circuit
P1787 OD Hydraulic Pressure Switch Circuit

http://www.dodgetalk.com/forums/showthread.php?t=177119

But I am afraid I can't tell you want all these codes mean for your car. It was probably not related to the change in fluid that was performed. However, it is serious and should not be driven until fixed. Risk of total destruction of the transmission is too great. I would assume the symptoms are so diverse that it may be a bad transmission control module. Which is about $200, and fairly easy to replace:
http://www.autocomputerexchange.com/Product/731
But there are other possibilities, such as a bad relief valve could be letting main pressure drop too low.
This is the type of thing which does require an expert and can't easily be done remotely.

Posted on Sep 09, 2010

  • Kirk Augustin
    Kirk Augustin Sep 10, 2010

    I agree.
    You need someone with more recent experience than I have, in order to have a better feel for what the array of codes correlate to.
    I would think it is likely you may be successful without having to pull the transmission as well.
    I do not believe it is a problem with the planetary gears or bearings, and is probably in the control systems that can be removed while still in the car.
    I hope you find the information you need.

  • Kirk Augustin
    Kirk Augustin Sep 10, 2010

    If the engine can stall, I agree that means fluid pressure has to be sufficient to engage a higher planetary gear clutch or band.
    But is that only happens cold, that could still mean a leak when it thins out, like a cracked pump gear even.

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1 Answer

Why my 2001 town & country 3.8 will not shift gears?


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Read more at: http://www.obd-codes.com/trouble_codes/
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