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Only first gear works, codes P0732 and P0700

Tiny
SHADETREE102
  • MEMBER
  • 2001 DODGE INTREPID
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 216,848 MILES
My car has sat for a few years, driven every couple months or so by a loved one, just to keep her in shape. Ran great. Loved one said that during a routine drive it started down shifting on its own, then would not leave second gear. Made it home safe and sound. Next drive it would not go in reverse. When I get my hands on it, I use auto stick and first and third have action. Still no reverse and when put in second, it will not leave second unless you leave auto stick. When you put it in drive, it is stuck in second. You can tell because second makes a faint "loping" rumble. Turn it off and on, the process repeats itself. Trouble code p0732 (second gear ratio incorrect) and p0700 (Transmission Control System - MIL Request).
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Saturday, September 8th, 2018 AT 1:54 PM

32 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like one of two things could be happening first the input shaft speed sensor can be off causing the codes or you have a TCM that is out. I would first try removing the electrical connectors from the TCM and check for corrosion on the terminals.

Here is the location of the sensor and the TCM so you can see whats going on.

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Monday, September 10th, 2018 AT 11:35 AM
Tiny
SHADETREE102
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I forgot to add that it is the R/T 3.5L, but I think it is the same in that diagram. Just got it onto the jack stands to check out what you advised and a thunderstorm began rolling in. I am shade-tree for real. Lol! Will let you know how it goes when I get to it. Thanks!
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Monday, September 10th, 2018 AT 12:46 PM
Tiny
KEN L
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Lol, yep a little tough in the rain. Please let me know. :)
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Tuesday, September 11th, 2018 AT 11:10 AM
Tiny
SHADETREE102
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  • 18 POSTS
I just crawled out from under her and all the connectors look new on the inside. I am not sure if it matters, but with the front end jacked up, the second gear noise seems louder. Perhaps being further from the ground has that effect. What do you think Mr Ken?
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Monday, September 17th, 2018 AT 4:05 PM
Tiny
KEN L
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Can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response. That way I can tell you if it is an issue or not. Also, did you try the speed sensor?
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Tuesday, September 18th, 2018 AT 10:25 AM
Tiny
SHADETREE102
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  • 18 POSTS
I have not changed the sensors. How can you tell if they are bad? I will get you that video ASAP.
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Tuesday, September 18th, 2018 AT 10:41 AM
Tiny
SHADETREE102
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Here is the video:
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Tuesday, September 18th, 2018 AT 2:58 PM
Tiny
KEN L
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Great work on the video. :) I do not think a turbine sensor is the problem it looks more like the TCM has gone bad, but to be sure lets run the codes and check for power and ground at the TCM. Here are three guides to help us run some tests and the TCM wiring diagrams and the location (above):

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-check-wiring

Confirm power and ground at the TCM check fuses and the transmission control relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Remove the electrical, connector to check for corrosion and the TCM as well. Check out the diagrams (below). Please run some tests and get back to us.
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Wednesday, September 19th, 2018 AT 3:59 PM
Tiny
SHADETREE102
  • MEMBER
  • 18 POSTS
Wow, this is great information! I will start working on it tomorrow if I have time. I was talking to my above stated loved one (aka Pawpaw), and he said that it started running hot and had a shop replace the thermostat. The mechanic had a hard time purging it, but did it "successfully". On the way home from the shop is when this problem began. I am going to see if the mechanic may have disturbed a pertinent wire around the thermostat. What is your thoughts on this? I will let you know what I find. Thanks!
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Wednesday, September 19th, 2018 AT 8:48 PM
Tiny
KEN L
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Yes, double check his work then use the wiring diagrams and guide to troubleshoot the problem.
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Thursday, September 20th, 2018 AT 3:59 PM
Tiny
SHADETREE102
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I have pictures of some things and a description, but I cannot upload the pictures. It says invalid file type.
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Tuesday, September 25th, 2018 AT 2:22 PM
Tiny
SHADETREE102
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Okay, I did some digging around and came up with a few possible issues. I hope you can read my handwriting in my diagram. That diagram is a connector that comes off the TCM bottom connector, but not directly. Once it gets to the firewall, it splits and this one goes down to the transmission. The two that do not have description and show no voltage are the two speed sensors. I read the diagram and saw that the black/light blue ties in with several other things. The engine temperature sensor happens to be one. The next two pictures are of a component on the intake manifold, just above the thermostat. The last picture is of the plug and wires that go to it. I have no idea what that component is, but I think it is shorting out, and causing my problem. What are your thoughts?
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Tuesday, September 25th, 2018 AT 2:23 PM
Tiny
SHADETREE102
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Finally! Here is the above mentioned diagram that I drew:
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Tuesday, September 25th, 2018 AT 2:35 PM
Tiny
KEN L
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The wiring connector in the picture you can see one of the terminals has pulled out? Can you check that for me. Also, what color wires go to the part in question? This sure sounds like a speed sensor is not working.
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Wednesday, September 26th, 2018 AT 10:22 AM
Tiny
SHADETREE102
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So far I cannot recognize the wire colors. I am going to have to cut back a good ways because they are burned. Yes that connector is loose and the wire will pull out of the back. It was secured when I pulled it off though. I tested the speed sensors as described in the link you provided and they were not getting juice. They checked out good on the wire test also. However, I could not get my hands in a good enough spot to unravel the ground splice I spoke of. I still could not get power by grounding elsewhere.
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Wednesday, September 26th, 2018 AT 10:35 AM
Tiny
KEN L
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I think we are getting side tracked here. It still sounds like the TCM is bad because it acts different in the autostick mode. If you have tested all the wiring power and grounds it only leaves the TCM.
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Thursday, September 27th, 2018 AT 11:40 AM
Tiny
SHADETREE102
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  • 18 POSTS
My life story! Do you think these wires shorting out could have fried the TCM? I am going as far as I can on the harness without removing too much so I can at least tape them up so they do not touch.
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Thursday, September 27th, 2018 AT 11:49 AM
Tiny
KEN L
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Yes, bare wires can create all kinds of problems. Tape the wires up and let's find a used TCM to see what happens.
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Friday, September 28th, 2018 AT 11:44 AM
Tiny
SHADETREE102
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I am having, some trouble. Which of these two "boxes" is the TCM?
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Sunday, October 14th, 2018 AT 10:28 AM
Tiny
KEN L
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It should be the one in front of the PCM check out the diagrams above shows the location. Upload a picture if you have questions
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Monday, October 15th, 2018 AT 10:52 AM

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