Under the hood on the driverside of the Cherokee is the PCM or Powertrain Control Module. The Transmission Control Module or TCM is under the dash on the driverside. It's actually kinda of small, I would guess 4 inches by 3 inches. with what look like wings coming off the sides and two bolts.
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In My 1995 Jeeg Grand Cherokee Limited Edition, I found it was inside the transmission its self
On a 95 Jeep GC it's either an integral part of the PCM (main computer) or a separate unit located inside the cabin on the firewall above the driver's foot nearest the door. 2 nuts to remove are located under the hood next to the brake booster.
Controls how the tranny shifts. Usually hard to change on newer vehicles because it is located inside the tranny. Be more specific.
Engine control module
The Transmission Control Module for your Grand Cherokee is located under the driver side of the instrumentation console (underneath the dash) up against the fire wall near the outside of the vehicle. You should be able to see it with a flashlight as the TCM has and orange/yellow connector.
If it is a 6 Cly. the most likely location is at about 11:00 on the bell housing looking forward. Very hard to get to and drooped bolts may end up in your transmission bell housing. Magnetic sockets and small hands advised.
It is a small computer inside the dashborad, almos behind the head light switch, it contros wiper blades, and some electrical thing of the jeep, it also stores the the vehicles mileage history, changing this will change your odometer reading.
It must be on the same location as in my 96 Grand Cherokee. Behind the spare tire there is a small door you can open and there you find that module. You got to remove the spare tire to see it.