2007 Jeep GCk Lmt Jolts as 2 gears at once - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Technical Discussion > Troubleshooting/Problems Discussion

Reply
 
Thread Tools Display Modes
 
  #1  
Old 11-04-2014, 04:25 PM
New Member
My Jeep: 2007 5.7L WK
 
Join Date: Nov 2014
Location: Michigan
Posts: 4
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
tomclement is on a distinguished road
2007 Jeep GCk Lmt Jolts as 2 gears at once

I have an intermittent problem with my Jeep Grand Cherokee Limited w 5.7 Hemi. (Vin = 1J8HR58217C629439) Occasionally it is like the transmission attempts to engage two or more clutches at once causing the vehicle to respond as though the drive train has momentarily severely locked up. You feel a jolt of sudden deceleration as though the wheel tried to lock up. The tach indicated rpm drops and the cruise disengages. The engine does not require restart and the vehicle recovers and drives normally though you must re-engage the cruise control and reset the speed. At time it will do it within a few minutes, other time it may go for a week without malfunction.

I have had it to the dealership several time. The code that was indicated is that “the transmission control module has lost power. The service manager at the dealership told me that the transmission control module is integrated with the engine control module. The service manager told me that the mechanics have checked all electrical connections and found no faults. They then ordered a new power train control module and a power control module and replaced these two modules. (Not cheep over 1100.00) I took the vehicle home and the very next day it did the lock-up twice within 3 miles. My brother was with me at the time.

There are no service lights illuminated. We love the vehicle but need some help from someone with knowledge beyond what we have at hand.

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 11-04-2014, 06:54 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,616
Thanks: 23
Thanked 424 Times in 409 Posts
Rep Power: 529939
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

Welcome to the garage.
I presume that this problem only occurs in 5th gear, never during acceleration?If the problem starts, for how long does it continue? You say that it recovers by itself?
Since the only code you had was power lost to the TCM, i would start looking there. I would swap the transmission control relay in the power distribution center under the hood with a similar one (donīt know if there is a similar relay in there, the PDC drawing shows a bit smaller size then all the others), or just put a new one in.
Normally the TCM monitors the pressures towards the clutches and sets a fault code when a clutch is pressurized when it shouldnīt be, but when the TCM has no power, it will not see it.
I only wonder if power loss to the TCM only, could cause this problem. Normally when the TCM is without power, it will go into limp-in mode, which is 3rd gear for the 5-45RFE. So it should release the 2C clutch and engage the UD clutch. If for whatever reason, those two clutches are pressurized at the same time (together with the OD clutch), then for sure a lot of resistance will be created.
Did you check the transmission fluid color and smell? If really three clutches are pressurized at the same time (two clutches is normal), a lot of heat will be generated and the slipping clutch can burn and/or wear prematurely.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 11-06-2014, 05:40 AM
New Member
My Jeep: 2007 5.7L WK
 
Join Date: Nov 2014
Location: Michigan
Posts: 4
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
tomclement is on a distinguished road
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

IT seems to do it at light throttle and cruise speed. Its occurrence duration is very short about 1 second, thus the jolt to the driveline. Yes it is in high gear torque convertor locked. It has not done it at slower speeds. The only code is P0884. I have to think that this is specific enough to point me in the right direction. Just need someone with through knowledge of this system. If it were a short, open, or loose connection I would think that it would happen at other speeds unless the circuitry involved is not active unless at cruise conditions.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 11-07-2014, 03:29 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,616
Thanks: 23
Thanked 424 Times in 409 Posts
Rep Power: 529939
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

The P0884 points to an intermittent power supply problem of the TCM. Since you donīt drive for longer periods in 1st and 2nd gear, the change that the power interrupt just then occurs is quite small. If it happens in 3rd gear, you will not see anything, because power off = 3rd gear.
I still would start changing the TCM relay first, just to be sure that the problem is not there.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
The Following User Says Thank You to Frango100 For This Useful Post:
  #5  
Old 11-07-2014, 06:21 PM
New Member
My Jeep: 2007 5.7L WK
 
Join Date: Nov 2014
Location: Michigan
Posts: 4
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
tomclement is on a distinguished road
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

That makes sense, I had it to the dealer and they changed the PCM & ECM which also changed the TCM being integrated within. I don't know if they changed the TC relay but will find out. I wish I could determine which power lead would cause these symptoms, it appears from the schematic that there are three power sources to the TCM.

Thanks again.
TC
Reply With Quote
  #6  
Old 11-08-2014, 04:22 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,616
Thanks: 23
Thanked 424 Times in 409 Posts
Rep Power: 529939
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

Just checked the wiring schematic and i also see three power sources into the TCM, but they all come from the transmission control relay. Do you have the same schematic as i have attached here?
Attached Files
File Type: pdf WK 4.7-5.7 trans control relay.pdf (134.0 KB, 5 views)
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #7  
Old 11-08-2014, 06:12 AM
New Member
My Jeep: 2007 5.7L WK
 
Join Date: Nov 2014
Location: Michigan
Posts: 4
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
tomclement is on a distinguished road
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

Thanks again, its good to talk with someone with your knowledge.
That's the one, straight from the service manual. The relay itself is a good suspect but so is the circuitry to and from it. I believe that I will find a connector that has been compromised, but could also be a damaged wire making intermittent contact to short in duration to open a fuse. Again thanks, I'll keep the thread current with my findings.
Reply With Quote
  #8  
Old 11-08-2014, 06:25 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,616
Thanks: 23
Thanked 424 Times in 409 Posts
Rep Power: 529939
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 2007 Jeep GCk Lmt Jolts as 2 gears at once

But you said that the stealer had already checked the electrical connections. Did you check if there is a similar relay as the transmission control relay in the PDC and just swap it, for trouble shooting?
At this point it would not make any sense to check the wiring on the transmission itself, since that should not cause the transmission control relay to open. Since the PCM is already changed, i would not suspect any problem in the connector overthere. Yeh, an internal wire break could eventually be the problem, i would check the cable loom coming from the PDC to the PCM for any sharp bends.
Which component the stealer changed besides the PCM, you said ECM i believe?But PCM (powertrain control module) = ECM (engine control module)
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
Reply

Tags
2007, jeep

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep Liberty decides not to start every once in a while arcox Troubleshooting/Problems Discussion 8 11-30-2015 05:24 AM
2012 gc lmt jtsull Grand Cherokee - WK2 - 0 06-27-2014 09:52 PM
Back into the Jeep world once again richscorvettes New Members - Welcome! 12 01-01-2013 02:00 PM
I'm a Jeep guy once again in Maryland Gymkata New Members - Welcome! 14 08-01-2011 07:15 PM
2007 wk 4:10 gears jeeppro Grand Cherokee - WK 14 12-01-2009 09:56 PM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:30 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.