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Old 04-02-2019, 05:50 PM
Monkey95 Monkey95 is offline
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Default Looking to find TC clutch circuit solenoid - P0740

Hey everyone, new to the forum. I've recently gotten a P0740 code pop up on my truck. it has a 4.7L engine with the 545rfe tranny in it.


I had no transmission problems at all until early last week, when it threw the code on my morning commute. About mid-week the code cleared itself and reappeared this past Friday.


Over the weekend I changed the atf and both filters, then unhooked the battery to reset the code. It worked great Sunday and Monday, but this morning the code threw again and the tc will lock and unlock while driving. I do almost entirely highway driving and put about 150 kms on per day.



The only other symptom I'm experiencing is hard shifting between 1st and 2nd gear and 1st to stop (which I realize might be unrelated).



Anybody know the location of the solenoid on the tranny to try and test or clean it? I'm also wondering which other steps, if any, that I need to go through before knowing whether or not it's the torque converter itself



Thanks in advance
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Old 04-02-2019, 07:52 PM
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jawzs2 jawzs2 is offline
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From the 2009 shop manual...

"The transmission solenoid/TRS assembly is internal to the transmission and mounted on the valve body assembly . The assembly consists of six solenoids that control hydraulic pressure to the six friction elements (transmission clutches), and the torque converter clutch. The pressure control solenoid is located on the side of the solenoid/TRS assembly. The solenoid/TRS assembly also contains the Transmission Range Sensor (TRS) and five pressure switches that feed information to the TCM."
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Old 04-02-2019, 09:03 PM
Monkey95 Monkey95 is offline
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darn i was hoping not to have to drop the valve body. Thanks for your help! i'll have to open it up again this weekend looks like
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