4l80e not going into OD
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Joined: Sep 2024
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4l80e not going into OD 06 Sierra 1500hd 6.0 4l80e 3.73 gears
I've read several forums and post about my issue but still don't know where to start.
My trans doesn't appear to be going into OD. Rpms appear hig, I'm also getting a hard shift from 1st to 2nd, and another weird issue that might be related the truck occasionally swing rpm ( +/- 100 rpm or so) at highway speeds only while in cruise control.
So far I've replace the throttle body because I thought maybe my tps was bad. This hasn't fixed anything. I've found the electrical plug on the side of trans has the typical ATF leak. Any suggestions on things to look out for, fix, or any troubleshooting steps.
Could this just be the trans solenoids or wiring? Any ideas or help are welcome
I've read several forums and post about my issue but still don't know where to start.
My trans doesn't appear to be going into OD. Rpms appear hig, I'm also getting a hard shift from 1st to 2nd, and another weird issue that might be related the truck occasionally swing rpm ( +/- 100 rpm or so) at highway speeds only while in cruise control.
So far I've replace the throttle body because I thought maybe my tps was bad. This hasn't fixed anything. I've found the electrical plug on the side of trans has the typical ATF leak. Any suggestions on things to look out for, fix, or any troubleshooting steps.
Could this just be the trans solenoids or wiring? Any ideas or help are welcome
TECH Fanatic
Joined: Jul 2022
Posts: 1,042
Likes: 392
From: Alaska
Can you read trans temperature in your scanner ?
IF trans temp sensor is OPEN it will indicate a very LOW temp, and things get screwy, definitely will prevent TCC lockup, not sure about OD.
. When you did transmission SEGMENT swap, are you sure that you included Trans Diagnstics segment as well ?
I ( Initially ) failed to include Trans Diagnostics, and had LOTS of trouble(s)
IF trans temp sensor is OPEN it will indicate a very LOW temp, and things get screwy, definitely will prevent TCC lockup, not sure about OD.
. When you did transmission SEGMENT swap, are you sure that you included Trans Diagnstics segment as well ?
I ( Initially ) failed to include Trans Diagnostics, and had LOTS of trouble(s)
Last edited by Full Power; Sep 28, 2024 at 03:26 PM. Reason: edit
Thread Starter
Registered User
Joined: Sep 2024
Posts: 2
Likes: 0
Can you read trans temperature in your scanner ?
IF trans temp sensor is OPEN it will indicate a very LOW temp, and things get screwy, definitely will prevent TCC lockup, not sure about OD.
. When you did transmission SEGMENT swap, are you sure that you included Trans Diagnstics segment as well ?
I ( Initially ) failed to include Trans Diagnostics, and had LOTS of trouble(s)
IF trans temp sensor is OPEN it will indicate a very LOW temp, and things get screwy, definitely will prevent TCC lockup, not sure about OD.
. When you did transmission SEGMENT swap, are you sure that you included Trans Diagnstics segment as well ?
I ( Initially ) failed to include Trans Diagnostics, and had LOTS of trouble(s)
Good question, but I can't read the trans temp on my code scanner but I have a gauge and the temp looks normal (160-170) I don't think that's the problem.
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Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Unless the Temp sensor is bad,
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