Transmission Problems-Line Pressure too High 5-45RFE

PhoenixCRD · **Posted:** Mon Aug 01, 2016 3:23 pm

My Liberty threw a generic P0700 error code and wouldn't shift out of 2nd gear. It also hard shifted from 1st to 2nd. I replaced both speed sensors and had my mechanic replace the pressure sensor since his code reader was able to pick up a more specific High Pressure code (not sure what the code number is). We are still getting the high pressure code and high pressure has been confirmed with a mechanical guage. The four transmission shops my mechanic uses have never come across this issue so we are at a standstill trying to diagnose the problem aside from taking out the transmission and tearing into it.

Anybody have any ideas what would cause too high a line pressure in the 5-45 RFE transmission?

I've scoured the internet looking for answers but nothing but kits to boost pressure???

TIA
Gary

geordi · **Posted:** Mon Aug 01, 2016 3:26 pm

Sorry to say, this is a new one on me too.

jws84_02 · **Posted:** Mon Aug 01, 2016 4:55 pm

This is just a wild guess. Does is have the ram tcm?? They do raise the line pressure and perhaps has something to do with it

flash7210 · **Posted:** Mon Aug 01, 2016 6:24 pm

Could be a bad regulator valve in the pump.

Or could be a bad line pressure control solenoid in the solenoid pack.

PhoenixCRD · **Posted:** Tue Aug 02, 2016 12:21 am

jws84_02 wrote:

This is just a wild guess. Does is have the ram tcm?? They do raise the line pressure and perhaps has something to do with it

No, it does not have the ram tcm but it does have the GDE towing tuned tcm.

Gary

PhoenixCRD · **Posted:** Tue Aug 02, 2016 12:24 am

flash7210 wrote:

Could be a bad regulator valve in the pump.

Or could be a bad line pressure control solenoid in the solenoid pack.

Thanks, I'll pass that along to my mechanic.

Gary

paul1386 · **Posted:** Tue Aug 02, 2016 12:49 am

My jeep threw a generic transmission code at around 290k. I changed the sump filter and the code went away.

PhoenixCRD · **Posted:** Tue Aug 16, 2016 4:18 pm

My mechanic found the problem a few days after I started this thread. Came down to a bad connection between the TCM and the connector harness. I'm fortunate my mechanic is also my nephew and wouldn't send it to the transmission shop before he exhausted all his knowledge, otherwise I probably would have had to buy a new transmission. Thanks to all that replied.

Gary

Transmission Problems-Line Pressure too High 5-45RFE

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