'93 concorde: limp mode, codes 24/42

QuestionEdit

QUESTION: I have a 93 concorde with 3.3 80k miles. always runs well. yesterday it wouldnt come out of 2nd gear.(im guessing limp-in mode) any suggestions? local autozone said they cant test cars under 96.

ANSWER: Hi Mac, You need to go to a shop that has an OBD-I code reader (e.g. Chryler DRB II or Snap On) with a Chrysler data link connector that will plug into a blue socket to the right of the steering column, under the dash. Then they would access the trans control module memory for a 2-digit fault code. Let me know what they find and recommend and we can compare that with the manual I have for that vintage vehicle. Please rate my answer (see below). Thanks, Roland

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QUESTION: Hi Roland,

Thanks for your fast reply! After doing some reserch online I thought it might be best to change the transmission oil, filter and valve body o-ring. What do you think? Good idea or maybe a waste of time and money.

ANSWER: I would not throw any parts at the problem, other than check that the fluid level in the trans is correct, until I got a code readout.

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QUESTION: Hello again Roland,

I brought the car to a local transmission shop and had them hook it up.. They came up with codes 42 and 24.

Waht do you think?

Thanks, Roger

AnswerEdit

Hi Mac, The 24 code points to a problem with the low/reverse pressure switch or its wiring, the 42 points to a problem with 2-4 solenoid or its wiring. I can tell you the wiring details if you have a volt-ohm meter and want to test those. At least you should examine the plugs and harnesses that connect the trans to the trans control module. Absent an identified wiring problem the usual approach would be to replace the pressure switch/soleniod pack. No parts are sold for it so that involves buying the pack, and installing it. The installation involves dropping the oil pan, removing the valve body and then that gives access to the solenoid/pressure switch assembly for replacement. While it is not absolutely certain that the replacement will solve the problem it is the typical step to take first rather than to remove and rebuild the transmission which is of course a major repair. If you don't have the shop manual I can photocopy and postal mail the pages thaa show you the details. Please 'rate' my answer (see below). Thanks, Roland