Question about 2002 Chrysler Town & Country

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I have 02 t&c. wont upshift and no speedometer. changed tcm, input and output sensors multiple times, still no upshift or speedo. no codes are showing after tcm change.

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Ok after a tcm change and sometimes after a battery replacement you will need to program the pinion factor(tire size)into the tcm.Without this information the tcm cannot calculate the math to give you speedometer operation.You will need to take to a trans shop or dealer.You will need to do a battery disconnect procedure,quick learn procedure and program in the tire size.About and hours worth of labor unless you find a guy like me that would take the 5 minutes and do it for free.Good luck!

Posted on Mar 28, 2011

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Replaced input and output speed sensors for erratic speedometer. Now the speedometer remains at 0. Anyone have a suggestion on what else could be wrong?


input and out put speed sensors tell the TCM and the ECM the difference between engine rpms and transmission input roms so that the correct gear ratio can be selected
A speedo sensor reads the out put shaft (drive line ) shaft and refers to road speed for speed and odometer readings and to calculate the fuel consumption rate
it is possible that you have replaced the wrong sensor
Talk with an accredited transmission specialist shop and have the problem diagnosed

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GOOD discriptoin but its tough to say .
Your not getting codes sometimes you don't if its not that big of a problem YET.
But it sounds like you may be heading for one.
May best guess is their is an internal valve that isn't working correctly or mabey a clogged filter .But it sounds like it can be fixed with out to much expence if you do it now
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Good Evening, I have a dumb question. have you cleared any current or history codes in the transmission? They will default with codes in the system. Also make note on what they are. If any and we can go from there, and yes tcm would be the next place to go but more info is best as far as codes and such.

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Your car has the A 604 transmission also called the 41TE,and it uses an input and output speed sensor mounted on the transmission.These speed sensors feed information to the Transmission Control Module (TCM) one of the vehicle's computers, which calculates vehicle speed,and sends a speed signal to the speedometer in the dash.It is a totally electric speedometer and odometer,no cable drive like old cars.So the first step would be to scan the vehicle's computers for diagnostic trouble codes,as a malfunctioning speed sensor can cause your symptoms,sometimes accompanied by no upshifting,or erratic shifting.All the components involved in the system have to be deemed good,or repaired if a component is found defective.With the scan tool,there is also a data stream available for viewing the systems while the engine is running and the car driving,to look for malfunctions.Within the data stream,i can look at the speed sensors individual outputs,and see what the computer is seeing as far as inputs and outputs.If the speed sensors check out ok,and are functioning properly,then the problem would likely be the instrument cluster,including the speedometer in the dash.But other components have to be verified good before drawing conclusions.

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