I have a 4.0L Laredo that is giving me transmission error codes 22 and 23. I know that the error codes are for an overdrive error and a torque converter error. I haven't been able to find any information on possible fixes. I replaced the governor solenoid and sensor about 4 months ago and now the Jeep is once again having shifting issues. My wife normally drives the Jeep but I did experience at least one issue with it. I was trying to get up a pretty long and steep hill. When I accelerated to maintain speed, the trans downshifted, held lower gear till about 4000 rpm and then upshifted. All seemed normal, however after upshift it had no power and could hardly pull itself up the hill. Luckily there was a spot I could turn around. Coasted downhill. Got to stop sign and it felt like it was pulling out in third or OD. Manually shifted into second at next stop and it started in first, shifted to second and then I shifted back into drive. By about 4th stoplight/sign it seemed to be shifting normal again. Mechanic seems to think its a mechanical issue with the torque converter. The Jepp has about 177K miles on it.

Could this problem be caused by an external (to transmission) issue either mechanical or electrical? If so, how can I determine?

Thanks

 

OBD-I codes 22 and 23 are for "Coolant temperature sensor or circuit" and "MAT sensor or circuit"

The transmission issue sounds electrical to me. Check the throttle position sensor with a meter (preferably analog). If that's worn out, you can cause unexpected up/down shifting. Also clean the two connectors against the firewall on the passenger side for all the transmission wiring.