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Old 01-05-2015, 05:39 PM
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Jeep WK P0732 DTC Issue

Good day all.. DIYer/Shadetree mechanic here looking for some help with my 2007 Grand Cherokee 5.7L with the 545RFE transmission with 60,000 miles. It's having some issues shifting.

Here's the situation: About a week ago the as I was accelerating on an onramp getting onto the highway, engine revved high, jolted into gear then the MIL lit up. Noticably reduced power when accelerating, and from a stop, the WK "jolted" into 2nd gear. Got home and hooked up to my scan tool which revealed a DTC P0732 - Gear 2 Ratio Incorrect.

The WK hard shifts from 1st to 2nd, will not shift past 2nd (limp-in mode). No leaks, no burning smell, fluid pink-brown upon observation (I checked it when swapped out the Input and Output Speed Sensors last month for a different issue). I have a feeling it may be the Transmission Solenoid/TRS Assembly, based upon the Factory Service Manual. I have been following the FSM step by step for diagnosing a P0732.

Diagnostic tests/procedures done so far:
-Rule out line pressure - the desired and actual line pressures are the same
-Rule out speed sensors - replaced last month, confirmed with scan tool
-Ran a series clutch tests which all passed
-Visually inspected transmission for leaks, disconnects, etc. and all looks fine
-Fluid pink-brown upon observation, no burnt smell
-Voltages appear correct as read with scan tool
I have not dropped the pan yet

Am I heading in the right direction suspecting the Transmission Solenoid? Limp-in mode usually suggests an electrical issue more than a mechanical issue, though that can't be ruled out. I have searched the forum and found lots of good info, but nothing addressing my issue specifically. Any ideas or suggestions? Anyone else have the same or similar experience? Just wanna get some input before dropping the $240 for the solenoid, and the 7 hours it will take to install. Anyone who regularly works on Jeeps knows what I mean - multiply the "projected time to complete" by 2.5 to get the actual time required to complete.... Thanks in advance!

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  #2  
Old 01-05-2015, 07:08 PM
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Re: Jeep WK P0732 DTC Issue

For what reason did you change the speed sensors? The line pressure you checked with the scantool only, or compared the scantool indication with an external gauge? When the line pressure sensor is faulty, you can still read the right line pressure on the scan tool, while the actual line pressure can be different. (but i would expect slipping in first gear as well in that case)
Not that it matters that much, but limp in mode for the 5-45RFE is third gear, when the shift lever is in D. It doesnīt seem to be in limp in mode, because then it would stay in 3rd gear and not start from 1st.
I would start cleaning the big connector on the left side of the transmission, which connects to the TRS/solenoid block. There could be a problem with one of the shift solenoids for 2nd gear. (the 2C solenoid, since the UD solenoid is already used for first gear and didnīt show any slipping.)
If possible, i would pull the pan and check for debris before ordering any parts.
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Old 01-05-2015, 08:39 PM
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Re: Jeep WK P0732 DTC Issue

I changed out the speed sensors because I had a P0715 a little over a month ago. As far as I know, everything on the car is stock/original from what I can see, or so I will assume, since I'm not the original owner. I'm from the school of thought that if the input sensor went bad, then it's not long until the output sensor goes too, so for an extra $30.00, I decided to replace both. It cleared the P0715 and the GC drove normally until this P0732 a few days ago.

Sorry, that's my mis-understanding of limp mode.. I thought it was the electronic tranny limiting access to certain gears to protect the engine. My GC shifts back to 1st when I come to a stop. I'm not slipping in 1st. I only used my scan tool, and I got matching pressures (124.97 if I remember correctly?). I did not attach an external gauge. For the record, the autostick doesn't work either.

The issue is that after the "jolt" into 2nd, I don't feel it shift past 2nd. The revs just climb proportional to my speed no shift is observed or felt. For example, at 70mph, I'm running at 3,500 RPM's, instead of the RPM needle hovering just above 2,000 at 70mph normally. For that reason, I haven't been driving the GC above 50-55mph (about 2,300-2,500 RPM under current conditions). I have no other vehicle so I have no choice but to drive it, even though I probably shouldn't. Other than the above mentioned issues - jolt into 2nd and the apparent lack of higher gears - the GC drives absolutely normal.

If I can't figure this out soon, I'll have to find the time to bring it to a tranny shop...

Like I said, I definitely have to get under the vehicle and pull the pan. Tomorrow I have a day off so I hope to get under my GC. I haven't ordered anything yet. Just want to get some more input, and finish the diagnostics as per the FSM. I'm up to step 11 of 15, which says:

"11. UD ACCUMULATOR PISTON
Check the UD bleed orifice, accumulator piston, and accumulator piston seal in the main valve body.
Were there any problems found?
Yes >> Repair as necessary. Refer to the Service Information for proper repair procedures.
No >> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1."

My thought was possibly the solenoid (I would have also suspected the speed sensors had I not replaced them) before I began diagnosing the issue. The FSM states to replace the solenoid if no issues found, which seems to reinforce my thoughts. I'm not jumping to coinclusions yet, as I still have steps 11-15 to run thru, plus Frango's advice (I actually work very methodically). I will post as I progress. Thanks for your help Frango!
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Old 01-05-2015, 09:53 PM
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Re: Jeep WK P0732 DTC Issue

I wonder why they are talking about the UD accumulator piston. In first gear the UD clutch is already pressurized, so there should not change anything when going to second gear. For second gear the 2C clutch will be pressurized together with the UD clutch, so my suspicion is going to the 2C clutch circuit.
Driving arround with a slipping clutch can burn the clutch material away quickly, resulting in a complete transmission overhaul.
I wonder if the transmission is not going from 1st gear to 3rd gear, after it sees that there is slippage in 2nd, and causing the jolt that way. 3500 rpm at 70 mph can almost not be in 2nd gear, when iīm not wrong.
I only wonder why its not going into limp in mode, while it sees that there is a problem which could harm the transmission.
I think that you can check the second gear clutches by putting it manually in limp in mode: if you pull the transmission control relay in the PDC under the hood, it will remove all power to the TCM part and from the solenoid block.
You will then have available reverse, 2nd gear and 3rd gear by selecting it with the shift lever. There will be no smooth shifting between 2nd and 3rd, but you can test the 2nd gear clutches without using the solenoids. If you donīt feel any slippage this way, then you know that the 2nd gear clutch circuits themselves are ok (so UD clutch and 2C clutch) and the problem must be with the solenoid block. I saw you mentioning a price for the solenoid block, but when needed you can get OEM transmission parts here: http://www.electricaladvantage.net/4...updated-1.aspx
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