Question about 1998 Chrysler Town & Country
I have the 3.8 liter with 4 speed ******. I replaced the input speed sensor and the vehicle will not shift out of 2nd or go faster than 40 mph without pushing the engine
It depends. Are there codes in the computer now? Has it bee reset since you replaced the input speed sensor? If the codes are still in there, the transmission may still be in limp-in mode.
Your transmission is computer controlled. Trying to diagnose or repair it without the ability to interface with the computer that controls it about the same as surfing the internet with no monitor. If you push the right buttons and click your mouse just right, you might get to the page you are looking for (not likely, but possible). However, when you do get there, you still won't know it....
Posted on Feb 22, 2012
Testimonial: "I brought the car to an expert who replaced the trans solonoid. Apparently the overdrive sensor was shorting out. Balch's Transmission in Purcellville are trustworthy experts."
Before you replace the solenoid pack you should at least check the output speed sensor. If this sensor fails it will also set a code and put the transmission in limp mode.
You will need a high end scan tool to check for codes in the trans computer, check sensor output data, clear codes, and perform a quick learn (if the solenoid pack is replaced).
It is far more common for input AND output speed sensors to fail than it is for a solenoid pack. As you know the speed sensors are fairly cheap. I'd hate to have you spend the money on a solenoid pack and not have it solve the problem.
If the input speed sensor was the problem the TCM should have seen that the problem was resolved after you started the vehicle, the vehicle should have driven/shifted normally.
I'm also curious if you may have replaced the output speed sensor instead of the input speed sensor. The input speed sensor is under the trens cooler lines and the lines need to be removed in order to replace it. The out put speed sensor is still on the front of the trans but more on the drivers side. Usually when the output speed sensor fails the speedo will also not work.
Also typically when a speed sensor fails the the trans will initially shift normally through all the gears until the vehicle comes to a stop (say at a stop sign or stop light). then the trans will default into second gear.
Pulling codes from the TCM is the best start as DT mentioned above!
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
Posted on Feb 25, 2012
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Posted on Jan 02, 2017
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