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sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 17043
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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1993 dodge caravan wont shift out of third gear up or down

Resolved Question:

1993 dodge caravan wont shift out of third gear up or down
Submitted: 4 years ago.
Category: Dodge
Expert:  sprinkles08 replied 4 years ago.

Hello and welcome to JustAnswer!

 

Which engine do you have in your van?

Do you have the three speed trans or do you have overdrive?

 

Customer: replied 4 years ago.
3.0 with overdrive
Customer: replied 4 years ago.
3.3 with overdrive
Expert:  sprinkles08 replied 4 years ago.

Ok great.

 

Your trans is fully electrically controlled by a module. When the transmission controller sees a problem it thinks can cause potential damage to the trans it will shut off the relay that powers the shift solenoids, and it locks you in second gear. This is called limp-in.

 

When the trans goes into limp-in it will set fault codes in the TCM. The first thing you need to do for this is have the codes read that are stored in the TCM. They will point in the right direction for diagnosis. The transmission related fault codes will have to be read with a capable scan tool through the data link connector under the dash.

 

There are many possible causes for limp-in. The most common and cheapest cause would be either the input or output speed sensors that are screwed into the front of the trans. These run about $20, are easy to change, and will be in stock at any parts store or dealer. If the speedometer always works ok when the trans won't shift you can rule out the output speed sensor, it's signal is also used for the speedometer.

 

The next most common cause would be a failed solenoid or clutch pressure switch. These are all inside the solenoid pack mounted to the front of the trans. If any of the solenoids or pressure switches are bad it requires solenoid pack replacement.

 

Other possible causes include internal trans problems, wiring from the trans to the TCM, or even the TCM itself. The stored fault codes will tell you where to start.

 

Customer: replied 4 years ago.
i have replaced the solenoid pack and speed sensors dont if it was input or input someone did it for me
Expert:  sprinkles08 replied 4 years ago.
Then you're going to have to see what fault codes are stored to be able to diagnose it properly. The codes stored will tell where to start diagnosis by telling you what system has seen the problem. For instance if there is a solenoid circuit code stored then you know it's a problem with a solenoid, the relay output feed to it, the TCM, or the control wire from the TCM to the solenoid pack. With your solenoid pack already being replaced that leaves internal trans problems, TCM, the relay, or wiring problems possible.
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 17043
Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
sprinkles08 and 7 other Dodge Specialists are ready to help you
Customer: replied 4 years ago.
could this be a bad computer
Expert:  sprinkles08 replied 4 years ago.
Yes, it could be a bad transmission control module (TCM). This is the module mounted to the firewall that controls all transmission functions.

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