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Unread 06-02-2010, 07:11 PM   #1
89cherokeeJP
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1998 grand cherokee tcm code

i have a 98 grand cherokee 4.0 2wd i stop at a advance autoparts on the way home and it showed a tcm code and was wondering where it was located i've seen some site say it's apart of the computer on the right firewall is this correct for this year please lmk asap

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Unread 06-02-2010, 07:29 PM   #2
ZeeJay1997
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96 and up have TCM and ECM combined in the PCM. It is behind the coolant reservoir.

What code?
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Unread 06-03-2010, 02:24 AM   #3
89cherokeeJP
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i'll get it
but would that be causing the erratic shifting
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Unread 06-03-2010, 06:05 AM   #4
ZeeJay1997
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Quote:
Originally Posted by 89cherokeeJP View Post
but would that be causing the erratic shifting
It's not common for the PCM to cause erratic shifting.

Likely a governor solenoid or TPS code.
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Unread 06-03-2010, 03:15 PM   #5
89cherokeeJP
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i went by a local junkyard today and the owner stated that the 98 models all had to have numbers matching replacements i've looked online haven't heard anything about it if fiquired if it had a 4.0 and 4sre 2wd it would work am i correct
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Unread 06-03-2010, 04:15 PM   #6
ratmonkey
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For a pcm? 96, 97, and 98 require different computers specific to those models. 98 also is vin programmed to the vehicle.

You don't need a pcm though. They almost never fail for the tranny controller.
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Unread 06-03-2010, 06:26 PM   #7
89cherokeeJP
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ok if it's not the pcm then what would cause the tcm code to throw
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Unread 06-03-2010, 08:20 PM   #8
ZeeJay1997
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Quote:
Originally Posted by 89cherokeeJP View Post
what would cause the tcm code to throw
There is no tcm or tcm code unless it's a 95 or down. AAP's code reader probably couldn't get past P0700 or P1700, which are top level codes and the parts clerk didn't know any better.

If you have a transmission related code, the PCM will code P07** or P17** on a generic scan tool. Go somewhere that has a generic scan tool, not a code reader.

I am fairly certain a 98 will NOT display MIL code with key sequencing, but if you want to try it:

(1) Cycle the ignition key On - Off - On - Off - On
within 5 seconds.
(2) After a short pause, the mileage shown on the
vehicles digital odometer will be temporarily deleted.
After this occurs, read the DTC number displayed on
the odometer. Each two–digit number will be displayed
with a slight delay between numbers.
(3) A DTC number 55 will always be the last code
to be displayed. This indicates the end of all stored
codes. After code 55 has been displayed, the odometer
will return to its normal mode.
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