Input shaft speed sensor location? I need to replace it

Tiny
WILLIEDYNAMITE11
  • MEMBER
  • 2007 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 182,000 MILES
I purchased the van used and I've been driving it now for about a year was curious to know why or what would possibly be causing not to get engaged in reverse? And recently is starting to feel as if it's surging or shuttering as I'm driving. More so kind of high mileage or higher miles per hour. Can you please give me some feedback? I would appreciate that. Thank you.
Sunday, February 9th, 2020 AT 5:19 PM

17 Replies

Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Reverse is the first to go when you have low pressure issues as reverse requires the highest pressure.

This could be caused by low fluid, a plugged filter, a bad pump, blown seal, bad solenoid or the least common a worn out clutch pack.

As for the other issue, that sounds like you have clutches slipping which could again be low fluid, or a plugged filter or worn out clutches. Given the mileage you likely need to rebuild the transmission. You have all the symptoms of it being at the end of its life span.

If it is slipping and not at the end of its life and the slipping is a result of another issue you will burn out the clutches if you continue to drive it.

I would recommend taking it to a transmission shop and have it diagnosed.

Rich
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Sunday, February 9th, 2020 AT 8:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,598 POSTS
I have seen the input shaft speed sensor cause this issue and sometimes cause a code. here is a guide to help you retrieve the codes and the sensor location so you can check it out:

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

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, February 10th, 2020 AT 3:52 PM
Tiny
KE4QDC
  • MEMBER
  • 2 POSTS
  • 2002 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Van will not come out of 2nd gear. Starts in 2nd gear and stays in 2nd gear. Computer codes says soemthign about modulator valve. Where is the modulator valve located and is it something easy enough for a average person to replace?
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/99387_Graphic9_51.jpg



have to check for TCM codes
most common speed sensors and or tranny solenoid packs
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
LEO MERCIER
  • MEMBER
  • 1 POST
  • 2002 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 134,800 MILES
I serviced my transmission, now on decel I get a hard downshift. Used Valvoline ATF4
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi billymac here. well there is really not anything that servicing the trans can cause.however here is a thought a lot of times when a trans is going bad the dirty fluid and worn fiber parts work as a replacement for clutch disc.and when you change the fluid then the disc will start to slip this is called washing,,was there metal in the pan when you changed the oil? another possibility is output sensor and input sensors or even trans computer.the computer has the capability of adjusting harsh shift patterns if this is the case driving it for a few days will solve the prob.
Has the check engine light come on?
It calls for Mopar ATF 4 so I would imagine the Valvoline you used would be an acceptable fluid, is the level correct?

Read the guide below, it might help you figure out whats going on

https://www.2carpros.com/articles/automatic-transmission-problems

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

hope this helps billymac

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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
SMCCULLIGH
  • MEMBER
  • 1 POST
I have a 2001 Dodge Grand Caravan. When I get up to 40 miles an hour it downshifts hard it feels like I'm slamming on the brakes. I've already changed the shift solenoid twice and I've had the transmission fluid and filter is changed. What else could it be?
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,598 POSTS
I have seen the input shaft speed sensor cause this issue here is the location so you can check it out. Check out the diagrams (Below). Please let us know what you find.
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
MINIVANMAN
  • MEMBER
  • 6 POSTS
  • 2001 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 133,000 MILES
My van has the check engine light on, what started happening is that the transmission wont shift past the second gear. It doesnt slip or it hasent lost power. I checked the fluid and its clean and at the right level. I checked the check codes and it reads a problem with the engine control module(computer), or at least that what the mechanic told me. Could changing the computer fix it or is it a gamble? Another simptom is that the speedometer sometimes works and sometimes it doesnt. Whats that about, is it related?
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
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1st step I would take would be replacing speed sensors
you have two input and output


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic9_56.jpg

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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
MINIVANMAN
  • MEMBER
  • 6 POSTS
First of all guys thanx for the info. Now a question, where is this famous TCM I keep hearing about, I cant find its location? I will first change the sensors and if that does'nt work I would like to know where the hell is the TCM before I take it to a mechanic. The codes that come out are p1684 wich I think means that the battery was disconected and the other is p0700. It has some e codes too, I have no idea what those mean e1003, e1004, e1005, and e1006, any info would be appreciated.
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
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The TCM is located behind the inner

fender well of the driver side wheel. It also has a very high failure rate due to corrosion and also check wiring because

of its location.
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
MINIVANMAN
  • MEMBER
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Hey guys here we are two years later and the tcm went out again, can you believe it, why is chrysler so low quality.
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BALDGUY
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  • 1 POST
  • 2000 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
The Dodge service department told me I need the speed sensors replaced
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BMRFIXIT
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Here are the sensor locations


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_150.jpg

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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
KOOLITZ916
  • MEMBER
  • 1 POST
  • 1998 DODGE CARAVAN
How to change the vehicle speed sensor of 98 dodge caravan 3.8 L and where is the location
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Friday, May 21st, 2021 AT 11:23 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/99387_Graphic_92.jpg



You have two speed sensors input and output
unscrew old one and screw new one in
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Friday, May 21st, 2021 AT 11:23 AM (Merged)

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