CODE U0146 NEED HELP

coyrl · **Joined:** Sat Feb 06, 2010 8:11 pm **Posts:** 15

Hello

I need help trouble shooting the code U0146 on my 05 CRD. I just rebuilt the motor from the ground up. Motor runs fine. However, the transmission will not engage and the CEL code is U0146. The TCM is modified with the GDE transmission tune and my ECU has the full torque tune. I also added an SEGR into the mix.

I would greatly appreciate some clues as to where I should check.

Thanks, Reid

coyrl · **Joined:** Sat Feb 06, 2010 8:11 pm **Posts:** 15

The TCM ground wire was disconnected causing the issue. Every thing is working fine except for a minor oil leak which I;ll correct tomorrow.

racertracer · **Posted:** Tue Feb 08, 2011 3:52 am

Coyrl,

Good to hear that your rig is almost back to normal, are you still considering posting your repair process?

OldSkull · **Posted:** Tue Feb 08, 2011 9:55 am

racertracer wrote:

Coyrl,

Good to hear that your rig is almost back to normal, are you still considering posting your repair process?

X2 + source parts and final cost :wink:

coyrl · **Joined:** Sat Feb 06, 2010 8:11 pm **Posts:** 15

Yes. I made a commitment and will follow through to build a blog. The entire process is documented and photographed. Will post sources and costs.

dunl · **Joined:** Mon Jul 27, 2009 6:18 pm **Posts:** 53

Looking for some help here...where is the "TCM ground wire' located?

I'm having ground issues and trying to sort this one. TCM is removed, but I don't see a ground wire on near it.

Thanks.

WWDiesel · **Posted:** Wed Apr 08, 2020 5:45 pm

dunl wrote:

Looking for some help here...where is the "TCM ground wire' located?
I'm having ground issues and trying to sort this one. TCM is removed, but I don't see a ground wire on near it.
Thanks.

There are several grounds that should be checked in the engine compartment.
A few pointers that will help I hope.

Jeep FSM (Factory Service Manuals) Online Link:> http://www.colorado4wheel.com/manuals/Jeep/KJ/
Online Link for 2005JeepKJServiceManual.pdf:> http://www.colorado4wheel.com/manuals/J ... Manual.pdf

I believe G102 is the correct ground for the TCM for a Jeep Diesel.
See Section 8W Wiring

G102 Ground under vacuum reservoir:

G111 & G112 Grounds:

dunl · **Joined:** Mon Jul 27, 2009 6:18 pm **Posts:** 53

Awesome, thank you!

dunl · **Joined:** Mon Jul 27, 2009 6:18 pm **Posts:** 53

Well,I assumed (incorrectly) that it would be the same, but I should have mentioned that I have a 2006 CRD. Looks like that's not the location for the 06, just the 05.

WWDiesel · **Posted:** Wed Apr 08, 2020 11:14 pm

dunl wrote:

Well,I assumed (incorrectly) that it would be the same, but I should have mentioned that I have a 2006 CRD. Looks like that's not the location for the 06, just the 05.

The FSM for the 2006 still shows the G102 ground but is also lists G100 for the TCM. Not having an 06 to look at, I cannot be sure.
The FSM's have been found to be incorrect on some items on occasion for the diesel equipped vehicles.

Just to be on the safe side, check all the grounds and make sure they are all in good shape.
You could check each ground at the TCM connector using a test light, there are 4 of them listed for an 06.
With the TCM connector disconnected from the TCM Module, using the diagram below to identify the correct pin numbers marked in RED location. 37, 39, 53, 57
Connect your 12v test light to the positive + terminal on the battery and then touch each of the four grounds to make sure they all light up nice and bright with the test light.

dunl · **Joined:** Mon Jul 27, 2009 6:18 pm **Posts:** 53

Thank you again, I will get on that tomorrow.

dunl · **Joined:** Mon Jul 27, 2009 6:18 pm **Posts:** 53

Well, all four lit up brightly.

I also thought previously that it might be the TCM, and had the opportunity to try one of the Dodge Ram TCMs that is supposed to be compatible. It remained in limp mode, with the same U0146 error, so I was hoping one of the grounds might be the problem.

WWDiesel · **Posted:** Thu Apr 09, 2020 9:45 pm

dunl wrote:

Well, all four lit up brightly.

I also thought previously that it might be the TCM, and had the opportunity to try one of the Dodge Ram TCMs that is supposed to be compatible. It remained in limp mode, with the same U0146 error, so I was hoping one of the grounds might be the problem.

Based on what you posted, a ground issue is not your problem and if you tried a different TCM and it still is doing the same thing, sound like you have a different issue.
Maybe time to take it to a good transmission shop with a scanner and see what is causing the problem?

CODE U0146 NEED HELP

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