TCM location??? - JeepForum.com

 
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post #1 of 12 Old 09-06-2006, 09:53 AM Thread Starter
scaaar
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TCM location???

Hi. I have a 99 Grand Cherokee V8 and am trying to locate the TCM to replace it. Can anyone help me with its location and possiblly removal instructions? Thanks!

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post #2 of 12 Old 09-06-2006, 09:59 AM
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Passenger side toward the rear but not on the firewall. It's kind of thick aluminum with cooling fins. Snould be easy to remove after you unplug the wireing harness.
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post #3 of 12 Old 09-06-2006, 11:41 AM Thread Starter
scaaar
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Thanks for the help. I cant seem to remove the bolt holding the wiring harness in place....it just keeps turning but the harness isnt coming out...any suggestions?
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post #4 of 12 Old 09-06-2006, 02:41 PM
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There are two tabs on each side of the harness connector that slide into slots on the TCM connector. You will probably need to slightly pry those tabs away from the slots before the harness connector will come out.

BTW, you haven't said why you want to replace the TCM. No offense intended, but there is more to this than just a simple take out the old and put in the replacement. Do the terms "Quick Learn" and "Drive Learn" mean anything to you?
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post #5 of 12 Old 09-06-2006, 03:14 PM
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are the PCM (Powertrain Control Module) and the TCM (im guessing Transmission Control Module) the same thing? I know the PCM is where you said, i thought the TCM was under the console but I could just be crazy....

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post #6 of 12 Old 09-06-2006, 03:45 PM
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Quote:
Originally Posted by AgitatedPancake
are the PCM (Powertrain Control Module) and the TCM (im guessing Transmission Control Module) the same thing? I know the PCM is where you said, i thought the TCM was under the console but I could just be crazy....
Not cracy, but maybe confused. PCM and TCM (yes, Transmission Control Module) are two different objects. The TCM is as described above. The PCM is in the same vicinity only mounted to the firewall with the connectors facing toward the front. The TCM connector faces to the side, the driver side.
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post #7 of 12 Old 09-06-2006, 10:58 PM Thread Starter
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Well, the jeep is in limp home mode....and the error code is P1698. I tried changing the two transmission speed sensors just in case but that didnt fix the problem. I found a TCM for $50 so figured I'd try that next before taking it in to get fleeced.
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post #8 of 12 Old 09-07-2006, 08:54 AM
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OK, I understand why you want to try replacing the TCM. If the replacement allows it to get out of the limp home, then you did good. After that, you should take it to the dealer for a "quick learn" procedure that must be done with the DRB scan tool. According to the FSM:
Quote:
This program allows the electronic transmission to recalibrate itself. This will provide the best possible transmission operation. The quick learn procedure should be performed if any of the following procedures are performed:
- Transmission assembly replacement
- Transmission control module replacement
- Solenoid pack replacement
- Clutch plate and/or seal replacement
- Valve body replacement or recondition
Good luck!
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post #9 of 12 Old 07-07-2014, 05:33 PM
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Were You able to remove the wiring harness by prying on it? I am getting frustrated here prying only seemed to snap the plastic around the harness and yet the bolt only spins and spins any help here?
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post #10 of 12 Old 07-07-2014, 05:50 PM
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This thread is almost 8 years old, I'm not sure you'll get the answer you're looking for. I'd check out the wj specific section for this question.
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post #11 of 12 Old 08-02-2015, 10:32 PM
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Hi I have a 2001 Jeep Grand Cherokee I just replaced Trans from a 99 and it's not shifting into overdrive. Sometimes it does but most of the time it doesn't. Where should I start?
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post #12 of 12 Old 08-02-2015, 10:52 PM
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You should start by posting in the forum for your model jeep which is here: http://www.jeepforum.com/forum/f310/

When this thread was started in 2006 the grand cherokees were all in one forum, the WJ has since gotten its own forum and you will have much better luck there.

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