I have a 2000 Chrysler 2.4L auto in which the speedometer stopped working. It will also not upshift past second gear. I have come to the conclusion that the speed sensor is damaged, and the transmission put itself in limp mode. I have taken the cover off the wheel and can see the tan sensor on the side of the transmission. Before I remove it, I would like to know of any complications I may run into. Is there a chance of fluid spillage when I inscrew this? Will the engine automatically reset itself once the new sensor is detected. If this does not fix the problem, what would be the next step?

Marvin

• 85242 Answers
• Posted on Aug 04, 2008

SOURCE: Hi, Got a Chrysler Voyager 3.3

How is your transmission shifting?
the reason I ask is because your code is a communication loss code between the TCM and the other module(s). It's not uncommon for the wiring problems to develop in the harness that runs from the PCM in front of the battery to the TCM on the Pass side inner fender. Look around where the harness is tie strapped to the transmission pan. it's common for the wires to break or be full of water especially after somebody has had the pan off or the transmission has been removed for repair. Can also be a wiring problem right at the PCM or TCM connector or the TCM itself TCM is transmission control module)
although not as likely as a wiring issue.
when communication is lost the transmission will go into limp mode which is 2nd gear and stay there. Sometimes it will come back every time the van is shut off. Not an easy fix but on the plus side not an overly expensive one if you're gonna tackle it yourself. You'll need a scanner that will give you input and output speed sensor readings and a wiring diagram. TCM's should be reasonably cheap used or even new, not sure haven't priced one in forever and the wrecking yard are full of them and even the connector(s) should they be required

SOURCE: 2001 Chrysler Sebring does not shift.

there is a plastic plug-in that screws into the side of the tranny and when it gets full of metal shavings it wont allow you to shift your gears...i dont remember exactually what its called but look it up this may be your problem

SOURCE: 1999 concorde. in limp mode with check engine

you should also replace the input speed sensor,they should always be done in pairs and i have had both of them bad on numerous vehicles,hope this helps

SOURCE: how do I change the three speed sensors on the transmission

change the out put sensor on the rear fo trans its cheap at auto zone 19.95

SOURCE: The transmission appears to be stuck in "limp-in"

The Transmission Relay is in the Power Distribution Box. It's one of the 3 smaller identical relays underneath the row of 7 larger identical relays. It's the top one immediately below the larger relays. Between the Park Lamp(Larger Relay) & Fuel Pump (Smaller Relay).

Fuse #14 is also for the Transmission Relay.