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Discussion Starter · #1 · (Edited)
Hello all, theres a long history on this one so I'll boil it down.

She's a 2015 Chrysler Town and Country, Touring L.

Symptoms:
Van won't shift beyond second gear.

Original Error codes:

P1745 - Transmission pressure too high for too long - causes van to go into "Limp mode" and will not go past second gear

P0868 - TRANSMISSION FLUID PRESSURE LOW OO

P0869 - TRANSMISSION FLUID PRESSURE HIGH OO

P0933 - HYDRAULIC PRESSURE SENSOR RANGE / PERFORMANCE

Others probably unrelated, haven't come back since clearing:
P0128 - coolant thermostat below thermostat regulating temperature 00

P0420 - cat system efficiency below threshold bank 1

P06DD - ENGINE OIL PRESSURE CONTROL CIRCUIT PERFORMANCE /STUCK OFF 00

I have replaced the:
Transmission solenoid pack (on valve body)

Transmission pressure sensor

Tcc trans clutch solenoid

Changed trans fluid and filter ( no metal in pan, quarter size amount of grey sludge)

General mechanic checked wiring from tranny harness

Trans specialist reset line counters

Cleared all codes, including the p1745. No check engine light.

Result:
Still not shifting beyond second gear. Transmission specialist thought the tranny was fine now and computer was at fault - should be letting van out of limp mode since there was no p1745 code any longer.

So then I replaced the PCM.

Did throttle relearn but was not able to do trans shift point relearn because trans still not shifting past second.

No codes and the transmission still will not shift beyond second gear.

I'm thinking it's probably something in the transmission still but what could it be? TIPM? Any ideas? This has ruined vacation plans and wife is understandably really down. At the point of trading in or complete trans replacement, few thousand$ 馃憥...
 

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Sounds like a bad valve body, or bad install of it. Needs to be properly torqued.

Your "other" codes are potentially serious engine codes. The P06DD usually means oil pressure is weak and it needs a pump. P0420 is usually a clogged cat. P0128 is a bad thermostat.
 
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Discussion Starter · #3 · (Edited)
Sounds like a bad valve body, or bad install of it. Needs to be properly torqued.

Your "other" codes are potentially serious engine codes. The P06DD usually means oil pressure is weak and it needs a pump. P0420 is usually a clogged cat. P0128 is a bad thermostat.
Brand new solenoid pack. Solenoid pack and valve body torqued to spec.

None of these other codes have returned and I don't believe they are tied to the transmission trouble. The van has been maintaining temperature for months after this, for example.
 

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It may be necessary to manually reset/clear the transmission line pressure counters (different from dtc's). A dealership can do this (might cost up to an hour of labor though) as well as a number of local/chain shops (stay away from AAMCO - all automatics must come out). Appcar-diagfca may be able to do this as well as alphaobd. I did a 'relearn' on my 2014 62te with appcar and noticed there were also reset routines for the transmission line pressure counters.
 

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Discussion Starter · #5 ·
It may be necessary to manually reset/clear the transmission line pressure counters (different from dtc's). A dealership can do this (might cost up to an hour of labor though) as well as a number of local/chain shops (stay away from AAMCO - all automatics must come out). Appcar-diagfca may be able to do this as well as alphaobd. I did a 'relearn' on my 2014 62te with appcar and noticed there were also reset routines for the transmission line pressure counters.
Thanks for the response and info Goose. Exactly right. I didn't list this, however, I already had my transmission shop do this. Still won't shift past second and no DTC's. I also completely replaced the computer after this at his suggestion. Same thing. No DTCs and won't shift beyond second. All of the counters you mentioned are physically within the PCM/ECM (that was changed out) also, right?
 

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Even when you change a PCM there are several reset procedures that must be done. If they skipped initialization procedures or did them incorrectly, you can have all sorts of issues.
 
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Discussion Starter · #7 ·
Even when you change a PCM there are several reset procedures that must be done. If they skipped initialization procedures or did them incorrectly, you can have all sorts of issues.
Yes, for sure. The place that did the relearn procedures was a reputable transmission shop. They specifically mentioned that they reset the counters and performed the relearn procedures.
The transmission still will not shift beyond second. No check engine light, runs smoothly besides that.

The new refurbished PCM acts the same as our old original PCM - no codes, Starts and runs fine, still no shift beyond second. My general mechanic wants to try a completely new PCM from the dealership feeling the "refurbished PCMs generally don't work because it has to be programmed in the vehicle". Thoughts anyone?

The dealership mentioned the other computer, the TIPM commonly causing problems. I'm wondering if there is any memory of trouble codes, deciding to put into Limp mode that the TIPM could be holding on to. Could there be something mechanical keeping it from second after being in limp mode for a few months? (I'm reaching for something here bc I don't know at this point)

If I can't get somewhere it's leaning towards a new transmission or trading in. I really hate to do that after being so deep into the troubleshooting of the transmission at this point.
 

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This whole thing would drive me nuts. Aside from tracing every wire from the transmission's main plug to the other end and checking resistance, I really don't know what to suggest. I have heard of TIPMs causing issues, but never without codes. That's the biggest oddity of this whole thing, no codes. Something should be freaking out.
 

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Discussion Starter · #9 ·
This whole thing would drive me nuts. Aside from tracing every wire from the transmission's main plug to the other end and checking resistance, I really don't know what to suggest. I have heard of TIPMs causing issues, but never without codes. That's the biggest oddity of this whole thing, no codes. Something should be freaking out.
Oh yea, it's a tough one for sure. It's driving my wife twice as crazy with not being able to go camping this weekend 馃挃鈽. Not good.

Sorry I should have mentioned, the general mechanic also checked the wiring from the main trans harness, all good.

No codes, but stuck in limp mode. That's why I'm looking at anything tied to deciding on limp mode or physical memory of related variables. Is any of this done in the TIPM?
 

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This whole thing would drive me nuts. Aside from tracing every wire from the transmission's main plug to the other end and checking resistance, I really don't know what to suggest. I have heard of TIPMs causing issues, but never without codes. That's the biggest oddity of this whole thing, no codes. Something should be freaking out.
Yes, the transmission goes to limp mode to protect itself. But, from "what"? Maybe there is no "what" to protect from.

Maybe, when in drive, all it knows is first and second gear or just second gear. That's the message it's receiving from the shifter. Any way to bypass that? What's showing on the display?
 
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Discussion Starter · #11 ·
Yes, the transmission goes to limp mode to protect itself. But, from "what"? Maybe there is no "what" to protect from.

Maybe, when in drive, all it knows is first and second gear or just second gear. That's the message it's receiving from the shifter. Any way to bypass that? What's showing on the display?
Yes, the trans specialist was thinking earlier, there is no "what". That's why we were going after the PCM to remedy.

What are you trying to bypass? I don't quite understand. I can put the shifter itself into Drive, reverse, neutral, manual no problem and the transmission responds to this appropriately. (Can't select different gears in manual though, probably because it's in limp mode)
 

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Discussion Starter · #12 ·
This whole thing would drive me nuts. Aside from tracing every wire from the transmission's main plug to the other end and checking resistance, I really don't know what to suggest. I have heard of TIPMs causing issues, but never without codes. That's the biggest oddity of this whole thing, no codes. Something should be freaking out.
I've got an update. I have a code now. I'm almost happy to have somewhere to look:
P0870 - transmission fluid pressure sensor/switch Circuit C
 

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Just noticed you never gave the year. I know it's a '11+, but the first few years the wiring to the PCM is slightly different. I can get you the factory troubleshooting procedure for your year if you post it.
 

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Discussion Starter · #14 ·
Just noticed you never gave the year. I know it's a '11+, but the first few years the wiring to the PCM is slightly different. I can get you the factory troubleshooting procedure for your year if you post it.
Excellent, thanks. She's a 2015 Chrysler Town and Country Touring L.
I'll add it to the original post as well.
 

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Here you go. Only 5 wires to check for issues. You obviously won't be able to do the transmission simulator parts, but it should get you in the right direction.
 

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