2006 CRD P0700 problem

giacomo.m · **Posted:** Thu Jul 22, 2021 2:40 am

Hi all,

it seems that the 2006 CRD has hard to find: 56044737AJ/R6044737AJ TCM
also does anyone know exactly which wiring behind the filter head bracket should I check ?
a photo would be very welcome .....
can someone help me ?
thank you

Giacomo

giacomo.m · **Posted:** Tue Jul 27, 2021 3:04 am

Hi all,

72 views and no response, mhhhhhh the problem is very technical .....
Has it ever happened to anyone ?
thank you

Giacomo

foxmiles · **Posted:** Tue Jul 27, 2021 8:40 am

Hey! I was hoping someone who could describe it better would pop in. I've got a 2005, so mine is different. Just examine all the wiring directly behind the fuel filter. There should be one or two looms, Not sure if they get crushed or rubbed, but check them out carefully, It's like a 3in x 4in area, right behind the filter housing. I've seen pictures but haven't found them yet, I'll link them if I run across them.

Now, as I recall, a p0700 code is a generic code in the ECM (I think) that just indicates there's a code in the TCM. You really need to get the actual TCM codes or you're just guessing in the dark as to what's wrong. Might help if you describe any symptoms you're having too.

I think it said you're in Italy, so I don't know how useful this info will be, but there's a Dodge Ram and I believe some Grand Cherokees around that era that use the same TCM hardware. At least the truck has a different shift pattern, but they are much cheaper and easier to find around here if you're just trying to confirm the problem and can get one easily.

Might want to check out any grounds around the engine compartment too. There's one by the left front fender that's bad to corrode and cause all sorts of problems, and I believe one back near the TCM somewhere.

WWDiesel · **Posted:** Tue Jul 27, 2021 12:58 pm

giacomo.m wrote:

Hi all,
72 views and no response, mhhhhhh the problem is very technical .....
Has it ever happened to anyone ?
thank you Giacomo

Found this one picture on LOST, there may be more if you search, not sure it applies to your euro model.

giacomo.m · **Posted:** Tue Jul 27, 2021 1:08 pm

Thank you all,
the symptoms are always the same: stuck on 3rd gear
instead as regards the TCM, which models / years of Dodge or Grand Cherokee have the same control unit ?

Giacomo

WWDiesel · **Posted:** Tue Jul 27, 2021 3:02 pm

giacomo.m wrote:

Thank you all,
the symptoms are always the same: stuck on 3rd gear
instead as regards the TCM, which models / years of Dodge or Grand Cherokee have the same control unit ?
Giacomo

The TCM is unique to the Jeep Liberty CRD due to its shifting patterns for the diesel engine.
Transmission Control Module (TCM) -- 56044737AB
Some have tried using a TCM from a Dodge Ram pickup that has the 545RFE transmission with some success. But with them there are some possible overrevving issues beyond redline when downshifting under power acceleration.

giacomo.m · **Posted:** Tue Jul 27, 2021 3:13 pm

but also to you it appears that the TCM is nowhere to be found ?
thank you

Giacomo

foxmiles · **Posted:** Tue Jul 27, 2021 8:59 pm

Stuck in 3rd gear is just limp mode, could be anything from a blow fuse/bad ground to a bad TCM or transmission. You can pull all the electrical plugs off the transmission or remove the TCM entirely and that's what you'll get. Quick hint: If you put it in "2" or "L" instead of "D" you should be in 2nd, which is a lot easier on it if you need to move it around. Of course I don't recommend driving it like that.

Mine suddenly went into limp mode once and it did end up being the TCM. Got lucky and found one on eBay, but I tried the Ram TCM first. It's not the same software, as WWDiesel noted, but at least I could (carefully) drive it like that until I located a proper Liberty TCM.

I still think you should try to get codes from the TCM, and double/triple check all the basics. For what it's worth I actually got the code from mine with a Obdlink MX and Torque Pro, though I didn't trust it and bought a $700 scan tool that told me the same thing... Well I guess I kinda needed a decent scantool anyway... Not sure if it would work with a generic dongle, a 2006 Jeep, or even if my 2005 is just a fluke, but it did get the actual TCM code.

Here's the Ram TCM thread (and a bunch of other potentially useful TCM info) - http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=70718

Sounds like a newer TCM might have some sort of "Multi Flash" and would behave like a stock liberty TCM. I haven't experimented with it, so I can't say for certain. I'll have to look for them next time I go treasure hunting at Pull-a-Part!

giacomo.m · **Posted:** Wed Jul 28, 2021 2:29 am

Thank you foxmiles and WWDiesel,
yes limp mode and the error code was extracted with dealer witech

Giacomo

WWDiesel · **Posted:** Wed Jul 28, 2021 11:45 am

giacomo.m wrote:

Thank you foxmiles and WWDiesel,
yes limp mode and the error code was extracted with dealer witech
Giacomo

Since you are in Italy, contact Yeti (Marco Giacomelli, he is in Italy) on this forum using email or pm buttons at the bottom.
He is also on FaceBook in the Jeep Liberty CRD Group.
Marco does reprograming of ECM's and I think he has done a few TCM's.
So he may be able to help you with reprograming a used TCM out of another vehicle.
:SOMBRERO:

SargeIndustries · **Posted:** Wed Jul 28, 2021 2:11 pm

I had mine stuck in third gear about a month ago on a long trip with the P0700 code. It turned out to be the large pancake filter in the transmission. I changed the oil and the filter and the problem went away.

giacomo.m · **Posted:** Thu Jul 29, 2021 2:32 am

SargeIndustries wrote:

I had mine stuck in third gear about a month ago on a long trip with the P0700 code. It turned out to be the large pancake filter in the transmission. I changed the oil and the filter and the problem went away.

Thank you
but oil and filter already replaced, and 1 year ago replacement of all solenoids .....

Giacomo

SargeIndustries · **Posted:** Thu Jul 29, 2021 11:36 am

Do you have a Transgo shift kit installed on your transmission? There is a resistor that is installed on the transmission pressure sending unit(passenger side of transmission) connecting wires 1 and 3 on the four wire plug. Tape came off of the connections for me and also set codes and stuck my vehicle into 3rd gear. Would be worth checking...

giacomo.m · **Posted:** Thu Jul 29, 2021 1:07 pm

No Transgo shift kit installed....

Giacomo

ebbnflow · **Posted:** Thu Aug 05, 2021 3:52 pm

If you had it scanned with a witech, what was the underlying code(s) in the TCM?

giacomo.m · **Posted:** Fri Aug 06, 2021 2:30 am

Only 1 code : P0700

Giacomo

2006 CRD P0700 problem

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