Transmission limp mode

Hi,
My 89 dynasty has started going into limp mode. After researching this in
other groups, the general consenses is the input or output speed sensor. I
have replaced both of these and it did not change anything. Before it goes
into limp mode, I noticed the other day what sounds like a small "buzz" the
instant before it goes into limp mode. It is very faint and hard hear. While
it is in normal mode, it shifts normally and has no signs of anything
mechanical failing inside. Also, turning the car off and back on temporarily
fixes the problem. Is there a way to get the control module codes? I tried
using the process of turning the key back and forth and only the code that I
get is 55, so that did not tell me anything. Does anyone else have any ideas
on what to try next? Thanks.

sounds like you need the transmission codes. Something there is telling the
computer to limp.

"rkm" > wrote in message ...
> Hi,
> My 89 dynasty has started going into limp mode. After researching this in
> other groups, the general consenses is the input or output speed sensor. I
> have replaced both of these and it did not change anything. Before it goes
> into limp mode, I noticed the other day what sounds like a small "buzz"
the
> instant before it goes into limp mode. It is very faint and hard hear.
While
> it is in normal mode, it shifts normally and has no signs of anything
> mechanical failing inside. Also, turning the car off and back on
temporarily
> fixes the problem. Is there a way to get the control module codes? I tried
> using the process of turning the key back and forth and only the code that
I
> get is 55, so that did not tell me anything. Does anyone else have any
ideas
> on what to try next? Thanks.
>
>

sounds like you need the transmission codes. Something there is telling the
computer to limp.

"rkm" > wrote in message ...
> Hi,
> My 89 dynasty has started going into limp mode. After researching this in
> other groups, the general consenses is the input or output speed sensor. I
> have replaced both of these and it did not change anything. Before it goes
> into limp mode, I noticed the other day what sounds like a small "buzz"
the
> instant before it goes into limp mode. It is very faint and hard hear.
While
> it is in normal mode, it shifts normally and has no signs of anything
> mechanical failing inside. Also, turning the car off and back on
temporarily
> fixes the problem. Is there a way to get the control module codes? I tried
> using the process of turning the key back and forth and only the code that
I
> get is 55, so that did not tell me anything. Does anyone else have any
ideas
> on what to try next? Thanks.
>
>

"rkm" > wrote in message ...
> Hi,
> My 89 dynasty has started going into limp mode. After researching this in
> other groups, the general consenses is the input or output speed sensor. I
> have replaced both of these and it did not change anything. Before it goes
> into limp mode, I noticed the other day what sounds like a small "buzz"
the
> instant before it goes into limp mode. It is very faint and hard hear.
While
> it is in normal mode, it shifts normally and has no signs of anything
> mechanical failing inside. Also, turning the car off and back on
temporarily
> fixes the problem. Is there a way to get the control module codes?

To pull the TCM codes you need a scanner and adapter that hooks into the
Chrysler CCD Bus plug. You're probably going to have to have the dealer or a
tranny shop do this. The stored codes will tell you why it's going into
Limp-In mode. It could be something as simple as a bad connection in the
transmission harness, or a serious internal problem.

"rkm" > wrote in message ...
> Hi,
> My 89 dynasty has started going into limp mode. After researching this in
> other groups, the general consenses is the input or output speed sensor. I
> have replaced both of these and it did not change anything. Before it goes
> into limp mode, I noticed the other day what sounds like a small "buzz"
the
> instant before it goes into limp mode. It is very faint and hard hear.
While
> it is in normal mode, it shifts normally and has no signs of anything
> mechanical failing inside. Also, turning the car off and back on
temporarily
> fixes the problem. Is there a way to get the control module codes?

To pull the TCM codes you need a scanner and adapter that hooks into the
Chrysler CCD Bus plug. You're probably going to have to have the dealer or a
tranny shop do this. The stored codes will tell you why it's going into
Limp-In mode. It could be something as simple as a bad connection in the
transmission harness, or a serious internal problem.

"SN" > wrote in message news:<F6o8d.3973$gk.1717@okepread01>...
> "rkm" > wrote in message ...
> > Hi,
> > My 89 dynasty has started going into limp mode. After researching this in
> > other groups, the general consenses is the input or output speed sensor. I
> > have replaced both of these and it did not change anything. Before it goes
> > into limp mode, I noticed the other day what sounds like a small "buzz"
> the
> > instant before it goes into limp mode. It is very faint and hard hear.
> While
> > it is in normal mode, it shifts normally and has no signs of anything
> > mechanical failing inside. Also, turning the car off and back on
> temporarily
> > fixes the problem. Is there a way to get the control module codes?
>
> To pull the TCM codes you need a scanner and adapter that hooks into the
> Chrysler CCD Bus plug. You're probably going to have to have the dealer or a
> tranny shop do this. The stored codes will tell you why it's going into
> Limp-In mode. It could be something as simple as a bad connection in the
> transmission harness, or a serious internal problem.


Sure, go ahead and pull the codes. While your at it pull the trans too
because it needs to be rebuilt.
Sorry, but that is the sad reality of those older 604 transmissions.

"SN" > wrote in message news:<F6o8d.3973$gk.1717@okepread01>...
> "rkm" > wrote in message ...
> > Hi,
> > My 89 dynasty has started going into limp mode. After researching this in
> > other groups, the general consenses is the input or output speed sensor. I
> > have replaced both of these and it did not change anything. Before it goes
> > into limp mode, I noticed the other day what sounds like a small "buzz"
> the
> > instant before it goes into limp mode. It is very faint and hard hear.
> While
> > it is in normal mode, it shifts normally and has no signs of anything
> > mechanical failing inside. Also, turning the car off and back on
> temporarily
> > fixes the problem. Is there a way to get the control module codes?
>
> To pull the TCM codes you need a scanner and adapter that hooks into the
> Chrysler CCD Bus plug. You're probably going to have to have the dealer or a
> tranny shop do this. The stored codes will tell you why it's going into
> Limp-In mode. It could be something as simple as a bad connection in the
> transmission harness, or a serious internal problem.


Sure, go ahead and pull the codes. While your at it pull the trans too
because it needs to be rebuilt.
Sorry, but that is the sad reality of those older 604 transmissions.

"GUNBUNNY31" > blathered:
>
>
> Sure, go ahead and pull the codes. While your at it pull the trans too
> because it needs to be rebuilt.
> Sorry, but that is the sad reality of those older 604 transmissions.

Yup, that's why these things have such a bad rap. (flameon) Every pinhead
pretend to be a mechanic just says the tranny is junk. (flame off) With the
symptoms you describe I'd bet it is an electrical problem - sensor, PRNDL
switch, computer, cel/pack, or even a bad wire or connection. Think about
it, if it was a mechanical thing why would restarting the engine correct the
problem? Kind of like rebooting your locked up computer, eh?

The other thing that kills these units is people who always put in the wrong
fluid saying oh, "this is the same thing" or "this replaces that fluid."

Unfortunately it is easier for someone to say that your transmission is
toast rather than to take the time to find the problem. If you can refer to
older posts on this issue - esp. one titled "93 Caravan Transmisson drops
out - electrical".

As far as the scanner goes - my experience has been that after you pay the
$100 at the dealer to have them check the codes, they still tell you that
you need a new transmission - after you spend another $500-$1500 changing
out the same parts I just listed above!

Get the part# of your computer, go to the boneyard and find one with the
same exact number. Put it in your car and see if it resolves the specific
issue. If it does, go buy a new one and put it in lest you'll then be
troubleshooting other intermittent issues in the near future.

"GUNBUNNY31" > blathered:
>
>
> Sure, go ahead and pull the codes. While your at it pull the trans too
> because it needs to be rebuilt.
> Sorry, but that is the sad reality of those older 604 transmissions.

Yup, that's why these things have such a bad rap. (flameon) Every pinhead
pretend to be a mechanic just says the tranny is junk. (flame off) With the
symptoms you describe I'd bet it is an electrical problem - sensor, PRNDL
switch, computer, cel/pack, or even a bad wire or connection. Think about
it, if it was a mechanical thing why would restarting the engine correct the
problem? Kind of like rebooting your locked up computer, eh?

The other thing that kills these units is people who always put in the wrong
fluid saying oh, "this is the same thing" or "this replaces that fluid."

Unfortunately it is easier for someone to say that your transmission is
toast rather than to take the time to find the problem. If you can refer to
older posts on this issue - esp. one titled "93 Caravan Transmisson drops
out - electrical".

As far as the scanner goes - my experience has been that after you pay the
$100 at the dealer to have them check the codes, they still tell you that
you need a new transmission - after you spend another $500-$1500 changing
out the same parts I just listed above!

Get the part# of your computer, go to the boneyard and find one with the
same exact number. Put it in your car and see if it resolves the specific
issue. If it does, go buy a new one and put it in lest you'll then be
troubleshooting other intermittent issues in the near future.

"saabturbo" > wrote in message >...
> "GUNBUNNY31" > blathered:
> >
> >
> > Sure, go ahead and pull the codes. While your at it pull the trans too
> > because it needs to be rebuilt.
> > Sorry, but that is the sad reality of those older 604 transmissions.
>
> Yup, that's why these things have such a bad rap. (flameon) Every pinhead
> pretend to be a mechanic just says the tranny is junk. (flame off) With the
> symptoms you describe I'd bet it is an electrical problem - sensor, PRNDL
> switch, computer, cel/pack, or even a bad wire or connection. Think about
> it, if it was a mechanical thing why would restarting the engine correct the
> problem? Kind of like rebooting your locked up computer, eh?
>
> The other thing that kills these units is people who always put in the wrong
> fluid saying oh, "this is the same thing" or "this replaces that fluid."
>
> Unfortunately it is easier for someone to say that your transmission is
> toast rather than to take the time to find the problem. If you can refer to
> older posts on this issue - esp. one titled "93 Caravan Transmisson drops
> out - electrical".
>
> As far as the scanner goes - my experience has been that after you pay the
> $100 at the dealer to have them check the codes, they still tell you that
> you need a new transmission - after you spend another $500-$1500 changing
> out the same parts I just listed above!
>
> Get the part# of your computer, go to the boneyard and find one with the
> same exact number. Put it in your car and see if it resolves the specific
> issue. If it does, go buy a new one and put it in lest you'll then be
> troubleshooting other intermittent issues in the near future.


Sure,
go ahead. spend good money after bad. the 3/4 clutch pack is probably
burnt up. <sarcastic voice on> I ain't never seen that before </voice
off>
There is a ton of truth to the fact that the wrong fluid was no doubt
placed in the transmission also.
I have the same trans in a 93 that is still going strong. BECAUSE I
TAKE CARE OF IT! I put ATF+3 and +4 in it and service it properly.
Those transmissions will hold up if just maintain them. The quick lube
joints are a boon to me. Only because they hire people who think they
will go blind if they actually read a service or owners manual.