C1444 Tranfer Case motor overuse?

Mike Owner Cromwell, Kentucky Posted   Latest   Edited  
Question
Drivetrain
2007 Jeep Grand Cherokee SRT8 6.1L (3) 5-spd (W5A580)—1J8HR78347C617502

this is the vehicle that has already eaten my lunch. I posted about it on here while back and got much needed direction. (thanks, btw) anyway, this vehicle had the transfer case exploded and Chrysler had most of parts on indefinite backorder. so customer found a remanufactured unit on ebay, so it was shipped to us and we installed it. after installation of transfer case and new oe motor, it sets code c1444. the only code it set with the old destroyed transfer case was the c1405. the range position voltage appears to be good at around 2.7 volts. all my powers and grounds are good to dtcm. I had a new oe dtcm here from the rabbit trail I went on before, so I installed it, same scenario. my question is, what is the dtcm looking for to set this code? Mitchell is very vague as to code setting parameters on this code. it says transfer case motor overuse and ultimately says to replace the switch (which this one doesn't have) or replace the dtcm (which I have a new oe that does same thing as original). to effectively diagnose this thing, I need to understand what a calibrated motor abuse limit has been achieved means? any insight into what i'm looking at (and why it didn't do this with original tcase) would be greatly appreciated. thanks.

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Allan Owner
Sterling, Virginia
Allan Default
 

Sitting or only after driving? If after driving are the tires all the same size and wear? just guess.

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JJ Technician
Quincy, Massachusetts
JJ Default
 

"Set Condition: A calibrated motor abuse limit has been achieved. The Final Drive Control Module (FDCM) monitors the motor use and has determined that excessive motor activations have occurred." This seems to be about as good as it gets as far as code description goes. Does position voltage move around a lot while driving, or even just sitting idle? Also, what's the difference between a NV245…

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Albert Owner/Technician
Towanda, Pennsylvania
Albert Default
 

I get as Possible Causes: Transfer case selector switch Final Drive control Module

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Mike Owner
Cromwell, Kentucky
Mike Default
 

It doesn't have a selector switch and the fdcm has been replaced with a new oe unit with no difference. It didn't set this code with the original tho.

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Mike Owner
Cromwell, Kentucky
Mike Default
 

that's the thing, when I graph it on scan tool, the voltage appears to be static and not moving around a lot. also, the rear tires are oversized on this, and from my understanding, this is normal on an srt8? wondering if I should hook an amp clamp and scope up and monitor the amperage going to motor, but without a known good, not sure what amperage range I should be looking at, and if the range…

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Allan Owner
Sterling, Virginia
Allan Default
 

Look at the door sticker and see if the tires should be different. We did tires on a SRT Jeep and they were the same. It’s AWD so Tire size difference would drive the transfer case crazy

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Mike Owner
Cromwell, Kentucky
Mike Default
 

both the door sticker and the Mitchell info shows it should have 255/45r20 on front and 285/40r20 on rear. the vehicle has 275/40r20 on front and 315/35r20 on rear. I would assume if the ratio of front to rear would be what dtcm is looking at? would this combo be enough conceivable difference to flag this code?

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Allan Owner
Sterling, Virginia
Allan Default
 

I doubt it. The Oe tires are both about 720 revs per mile. The ones on it now are about 729 in front and 724 in rear. Some od that depends on brand used but I doubt less than 1% would cause an issue

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Stephen Technician
Gallatin, Tennessee
Stephen Default
 

Seeenshow the same module(s) and wiring did not code on the old TC, I’m real suspicious of the new TC. Any chance to connect the old one up for test? The leads could be extended for the test.

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Mike Owner
Cromwell, Kentucky
Mike Default
 

I thought about that as well, however we split it apart and everything in it was exploded; even the clutch drum was ruined. not even sure it would bolt back together correctly to get the shift fork to contact the clutch pack.

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Troy Owner/Technician
Longbranch, Washington
Troy Default
 

I would be concerned about the tc from ebay, I am not saying you cannot get good stuff from them but if there are speed sensors in it you have a possibility for not having quality parts installed but that is just an opinon

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Mike Owner
Cromwell, Kentucky
Mike Update
 

update: if I leave vehicle stationary and idling in bay, the motor amps and volts will cycle on and off like it's trying to ramp the clutch off and on, however the range position voltage remains at 2.78 volts at all times, and then it sets a c1415 code. I can erase it, and if it's stationary, it will duplicate it every 30 seconds. my hyposthesis is the clutch pack may be way too tight and the…

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JJ Technician
Quincy, Massachusetts
JJ Default
 

That makes more sense. The position voltage is probably a valid value, it's just not the voltage it wants so it keeps trying to move the motor to get the voltage it wants. I was thinking position voltage would be indicating motor movement, but if the motor can't move voltage will never change. Maybe pop the motor off and make sure it will move ok on its own. If the motor is ok then I think…

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Stephen Technician
Gallatin, Tennessee
Stephen Default
 

Can the motor be removed and the transfer case shifted manually to check range position function? An amp clamp on the motor would show commutator pulses to see how much the motor is moving.

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Mike Owner
Cromwell, Kentucky
Mike Resolution
 

update: the transfer case has the clutch pack too tight. I monitored the motor and the amperage was maxing out when you turn the key on, (with it bolted up) even though the motor wasn't moving. when I got under the car to check the motor, it was extremely hot to the touch also. It also had the rear seal leaking badly already as well. I called the remanufacturer and he's sending another unit…

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