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Thread: 2020 RAM 2500 68RFE Trans Throwing Code?

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    2020 RAM 2500 68RFE Trans Throwing Code?

    I currently have a 2020 RAM 2500 with the 68FRE.

    I was driving down the highway this morning in 6th gear, got on it to merge over, and heard a weird whining sound coming from what seemed to be the transmission.

    Then shortly after, the engine light came on.

    I scanned the code and got code P0729 (Gear 6 Incorrect Ratio).

    Then I drove the truck around, and everything seemed fine.

    It was shifting like it usually does and going through all six gears without any issues.

    The truck has 40,000 miles on it and is not ragged.

    I checked the transmission fluid, and it was at a normal level.

    The noise from the transmission happens when the engine is under load at high RPM in the 5th/6th gear.

    I just was wondering if anyone had any insight on what is wrong.

    Or if anyone has had the same issue before.

    Thanks.


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  3. Top Of Page | #2
    I WILL STAND! AK Bob's Avatar

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    2020 RAM 2500 68RFE Trans Throwing Code?

    Attached is the troubleshooting information for your code.

    The fact that you hear the transmission noise under load would suggest a mechanical issue inside the transmission.

    Hopefully, someone more knowledgeable on the 68RFE will follow up on this.

    Attached Files Attached Files
    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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    2020 RAM 2500 68RFE Trans Throwing Code?

    Quote Originally Posted by AK Bob View Post
    Attached is the troubleshooting information for your code.

    The fact that you hear the transmission noise under load would suggest a mechanical issue inside the transmission.

    Hopefully, someone more knowledgeable on the 68RFE will follow up on this.
    Thanks will take a look at it.

    Yeah, it was very odd.

    The truck is stock and wasn’t towing anything at the time, either.


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  7. Top Of Page | #4
    Permanent Vacation Chrisn162001's Avatar

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    2020 RAM 2500 68RFE Trans Throwing Code?

    If you have an incorrect ratio code, it’s almost guaranteed clutches are slipping.


    Sent from my iPhone using Tapatalk


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  9. Top Of Page | #5

    2020 RAM 2500 68RFE Trans Throwing Code?

    I believe you still have a warranty on your truck (mileage and time - powertrain warranty).

    I agree with Chrisn162001.

    Based on what you described and what gears you said the sound was happening in, I would say it is the clutches.

    I replaced my 68RFE in my 2012, which had just over 60,000 miles on it.

    I ran 295/65/20 tires (35'X11.50") tires for like 2000 miles with a 3.73 gear ratio, and it didn't like it.

    I now have a remanufactured 68, and I strongly consider switching my gears to 4.10s.

    What size tires are you running on your rig?


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  11. Top Of Page | #6

    2020 RAM 2500 68RFE Trans Throwing Code?

    Quote Originally Posted by ECLIPSE22 View Post
    I believe you still have a warranty on your truck (mileage and time - powertrain warranty).

    I agree with Chrisn162001.

    Based on what you described and what gears you said the sound was happening in, I would say it is the clutches.

    I replaced my 68RFE in my 2012, which had just over 60,000 miles on it.

    I ran 295/65/20 tires (35'X11.50") tires for like 2000 miles with a 3.73 gear ratio, and it didn't like it.

    I now have a remanufactured 68, and I strongly consider switching my gears to 4.10s.

    What size tires are you running on your rig?
    Currently on Coopers 285/60/20.

    And the truck is still under warranty.

    Taking it in on Monday to the dealership and will see what they say.

    It was just really odd to happen out of nowhere.


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  13. Top Of Page | #7
    I WILL STAND! AK Bob's Avatar

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    2020 RAM 2500 68RFE Trans Throwing Code?

    Quote Originally Posted by DarkTimes View Post
    Currently on Coopers 285/60/20.

    And the truck is still under warranty.

    Taking it in on Monday to the dealership and will see what they say.

    It was just really odd to happen out of nowhere.
    Please keep us posted.

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  15. Top Of Page | #8
    Watch Dog! Corkey's Avatar

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    2020 RAM 2500 68RFE Trans Throwing Code?

    Would this code still be stored in the TCM?

    Or perhaps it's still present to show the dealership proof of the issue?

    I am trying to help you out on Monday.

    I know dealerships will use every excuse to avoid work without proof in the pudding.

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

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  17. Top Of Page | #9

    2020 RAM 2500 68RFE Trans Throwing Code?

    Quote Originally Posted by Corkey View Post
    Would this code still be stored in the TCM?

    Or perhaps it's still present to show the dealership proof of the issue?

    I am trying to help you out on Monday.

    I know dealerships will use every excuse to avoid work without proof in the pudding.
    Yeah, I am pretty sure that it is stored in the TCM.

    When I pulled up the code, it had details about the line pressures, temps, etc., in the description.

    And the engine lights are still on, so hopefully, they shouldn’t trouble me.

    I had to drive the truck home from work tonight, and it ran through the gears fine but was very light on the throttle.


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  19. Top Of Page | #10
    Watch Dog! Corkey's Avatar

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    2020 RAM 2500 68RFE Trans Throwing Code?

    Quote Originally Posted by DarkTimes View Post
    Yeah, I am pretty sure that it is stored in the TCM.

    When I pulled up the code, it had details about the line pressures, temps, etc., in the description.

    And the engine lights are still on, so hopefully, they shouldn’t trouble me.

    I had to drive the truck home from work tonight, and it ran through the gears fine but was very light on the throttle.
    Perfect, that'll be more than enough to verify.

    Sorry, you're having issues already though.

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

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