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Thread: P0740 / P0750 Codes With Limp Mode

  1. Top Of Page | #11
    Ramkins2012's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    I’m legitimately interested to see what happened at this point.

    The builder has done everything that should be done, oversized switch valve, billet accumulators with triple seals, vacuum tested, etc etc.

    However something obviously went wrong, somewhere.


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  3. Top Of Page | #12
    z28-50's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    @Ramkins2012

    Quote "I ordered a performance valve body and a new Mopar Solenoid pack."

    What company did you get the valve body from?

    2015 / RAM / 2500 CTD-68RFE-4wd / 3.42 / stock tire size / Silver / Bighorn

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  5. Top Of Page | #13
    Ramkins2012's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    Honestly, I would rather not say yet.

    I don’t know if the valve body caused the problem or not yet, and the shop has been helpful and is working with me on a fix.

    I will write an update after I have the facts.

    I think that’s the most fair thing to do.

    I want to give the shop a fair shake.


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  7. Top Of Page | #14
    Permanent Vacation Chrisn162001's Avatar

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    P0740 / P0750 Codes With Limp Mode

    Stuff happens.

    Wait to see what they say before blasting them.

    Every shop gets comebacks; any technician that says he doesn’t have comebacks is a liar.

    I had a few valve bodies come in with P0871 shortly after rebuilding.

    When my first set of reamers wore out, I found that I was getting close to 30in of vacuum after I reamed the SSV.

    At the time, I thought I was getting good at reaming them to get such perfect vacuum readings.

    Come to find out, and my reamers were undersized a hair from using them, thus under sizing the bore allowing the SSV valve to bind in the bore.

    Now I replace my reamers after 100 uses.

    I also had a pump pressure regulator valve that was slightly bent or missed machined.

    Luckily I caught it before installation.


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  9. Top Of Page | #15
    z28-50's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    My intention wasn't to start anyone slamming anyone or generate any slamming.

    I am getting ready to order a valve body and deciding where to get it from.

    There are many recommendations for good builders other than the big marketed names.

    2015 / RAM / 2500 CTD-68RFE-4wd / 3.42 / stock tire size / Silver / Bighorn

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  11. Top Of Page | #16
    Ramkins2012's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    I understand people would like to know, and I also understand stuff happens, and again this shop is known to be good with 68RFE and 47/48 stuff.

    I know how the internet is with things, and I want to give the guy a fair shake.

    The reamer was a topic of discussion, and I think he mentioned them being replaced after 50 jobs.

    However, at this point, I still don’t know that the Valve Body is necessarily the issue.

    It sounds like it could be within the pump also. We will see what is found, and I will let you know.


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  13. Top Of Page | #17
    Permanent Vacation Chrisn162001's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    Quote Originally Posted by Ramkins2012 View Post
    I understand people would like to know, and I also understand stuff happens, and again this shop is known to be good with 68RFE and 47/48 stuff.

    I know how the internet is with things, and I want to give the guy a fair shake.

    The reamer was a topic of discussion, and I think he mentioned them being replaced after 50 jobs.

    However, at this point, I still don’t know that the Valve Body is necessarily the issue.

    It sounds like it could be within the pump also. We will see what is found, and I will let you know.


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    The pump has nothing to do with the P0871 code.

    I hope he’s honest with you and doesn’t give the runaround.

    The reality is you changed the valve body and got a code immediately.

    It’s the valve body, and it always is with that code.

    Whether it’s workman ship or bad parts, it’s within the valve body.

    I hope it works out for you and they make it right.


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  15. Top Of Page | #18
    Ramkins2012's Avatar

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    Re: P0740 / P0750 Codes With Limp Mode

    I wanted to update this thread on where I ended up with my transmission issues, as I did end up with a complete rebuild.

    The builder double-checked the valve body I used before installing it in the new transmission and didn’t find any issues.

    Inside the transmission the overdrive clutches were really the only thing damaged.

    So I have a theory on what happened, but I haven’t been able to confirm it yet.

    I bought a grey connector solenoid pack (new Mopar) for the truck since it was a 2012, and that’s what was currently in the truck.

    Then decided to buy the valve body after that fact. I’m wondering if the grey solenoid pack and the valve body possibly didn’t like each other.

    I haven’t been able to confirm with the builder yet but I have heard that the different solenoid packs have differences related to the overdrive solenoid.

    Then depending on how Many check ***** the valve body has can determine which solenoid pack can be or should be used.

    This may explain why I immediately had a failure of the overdrive clutches.

    After the transmission rebuild the original billet valve body is in the transmission with a white connector solenoid pack (didn’t reuse the grey solenoid pack just because I didn’t want to take a chance).

    At this point this is just my theory but it makes sense to me.

    In other news the new transmission which is from Jacob Benton at Benton’s Diesel and performance is working like a champ.

    The turn around time was fantastic, no leaks, no loose bolts etc.

    The price was definitely very competitive and he offers a 2 yr unlimited mileage warranty.


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