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Old 12-15-2014, 02:00 PM
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Trouble-shooting TCM error code.

I have a 2000 Grand Cherokee Ltd. with just over 263K miles on it. About two years ago, 'check engine light' came on, pulled the 0700 code. Read that input/output sensors are a common failure. An inexpensive part--I changed them both, no issues since. Recently, the 'check engine light' came on again--coming on, and then going off at around 50 mile intervals. When the light comes on, the only performance issue noted is that it enters what I've read as 'limp mode' [accelerates from a stop in what feels like a higher gear--2nd or 3rd]. Went to Advance auto to see if they could pull the specific TCM code and the rep pulled "'1733'--4C pressure switch check malfunction". On a 45FRE transmission, is this the pressure switch/sensor located between the I/O sensors?

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Old 12-15-2014, 04:00 PM
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Re: Trouble-shooting TCM error code.

There are 5 pressure switches in the TRS/solenoid block. These switches are tested automatically by the TCM and when not in the required position for two consecutive times, a fault code will be set and limp mode applied (3rd gear)
This is most probably a fault of the pressure switch itself. Eventhough the advise is to not open the TRS/solenoid block, there is a repair kit available from www.electricaladvantage.net. This kit contains new rubber membranes for the pressure switches. You can ofcourse also change the whole solenoid block for this. I received this repair kit from them when i asked for the solenoid seal plate only and changed the membranes.
There is still a possibility that there is an internal leakage, preventing the pressure switch to activate. Does the transmission shift normal once it is in limp mode and you restart the engine? If it does, i would expect the pressure switch itself.
There is only one pressure sensor on the outside of the transmission, but it sits on the opposite site of the speed sensors. its the line pressure sensor and has nothing to do with your problem.
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Old 12-16-2014, 04:22 PM
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Re: Trouble-shooting TCM error code.

Frango100,

Thanks for your reply. My GC shifts normally when the check engine light comes on, and the light usually goes out after around 45 to 50 miles.it merely enters limp mode when the light comes on – – that is, accelerating from a stop.I believe I may just replace the solenoid block. Is it located on the exterior of the transmission on the driver side between input and output sensors?

Thanks again,

Richard M.


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Old 12-16-2014, 06:35 PM
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Re: Trouble-shooting TCM error code.

Frango100,

Once again, thanks for your reply – – did considerable more research and found a couple of links and videos to the replacement/installation of the solenoid pack. Will let you know how it turns out.


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Old 12-16-2014, 08:22 PM
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Re: Trouble-shooting TCM error code.

Your jeep most probably still has the older black connector solenoid block. This block is not made anymore and a better white connector solenoid block replaced it. For this newer type block to fit well, also the TRS selector plate needs to be changed. Electrical advantage sells both for around USD 270. If you need any help for the solenoid block change, just let me know.
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Old 12-16-2014, 09:34 PM
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Re: Trouble-shooting TCM error code.

The part listed on 'electricaladvantage.net' lists it as compatible with GC 99-01 4spd RWD '4x4'-- mine is 2WD. Is this still compatible? Additionally, I'm going to change the transmission fluid and filters while I'm in there. Will my transmission have the spin on filter in addition to the block filter?my Chilton manual suggest that it 'may'have the additional filter.


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Old 12-17-2014, 06:59 AM
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Re: Trouble-shooting TCM error code.

Your jeep should have had the TCM flash, back in 2000, which gave it the extra fifth gear. For the transmission itself, the solenoid block is the same for 4x2 or 4x4, but the transmission pan is different. For that reason you should get the oval inlet filter for a 4x2. There is also a round spinon return filter inside the transmission. Take care when installing the oval inlet filter; first install the filter seal in the transmission with the help of the butt end of a hammer or alike, and then install the filterneck into the seal. If you would try to install the filter with the seal on it, the seal will not fit well and can come loose during driving.
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Old 01-01-2015, 02:33 PM
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Re: Trouble-shooting TCM error code.

Finally completed the solenoid block replacement and fluid & filter change. It was quite simple, but messy. No error code now, but I notice a 'mild' slipping at around 30 mph--usually in the first 10 minutes of operation. I've driven about 300 miles since the repair. Added 3 qts of Castrol ATF 4 and level is fine--although rep at Advance Auto suggested that I could add 4 1/2 to 5 qts (?). Perhaps a TCM issue?


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Old 01-01-2015, 09:33 PM
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Re: Trouble-shooting TCM error code.

How did the old fluid look like? No dark (black) color or burnt smell? Fluid and filter change normally takes 6 Qts of ATF +4 (7 Qts will stay in the torque converter and clutch pistons)
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Old 01-01-2015, 10:20 PM
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Re: Trouble-shooting TCM error code.

Actually--and embarrassingly--the fluid was quite dark but 'clean'. No debris or particulates in the pan. I'll check the level again and add as necessary


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Old 01-01-2015, 10:57 PM
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Re: Trouble-shooting TCM error code.

Being the 1st time I've ever changed the tran. fluid, after draining the fluid, replacing the filters, and solenoid block--I can safely add 4 to 5 qts of fluid safely, and another qt if necessary? I'm a little nervous about over/under filling the transmission. Initially, the fluid level was hard to gauge as the filler tube was slick with fluid, making hard to get a good reading.


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Old 01-02-2015, 04:56 AM
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Re: Trouble-shooting TCM error code.

Over time the transmission fluid color can change and become darker. As long as its not completely black or with a burnt smell it should be ok.
Checking the fluid level can be difficult, but remove and insert the dipstick several times (and clean in between). 5 Qts is not enough in my transmission, but iīm not sure if the 4x2 pan takes as much as the 4x4 pan. A too low level will cause slipping and should be corrected immediately.
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