Eaton Endurant transmission problem

Goodysnap · Feb 26, 2023

MicksRule said: ↑

Thanks for the info.

One more quick question. Will the module retain the codes? I'm thinking yes, but just wanted to make sure.
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Yes the TCM will log the faults and store them, as long as nobody hooks up and clears them.

Be careful with universal tools. Sometimes they can clear all modules.

MicksRule · Feb 26, 2023

Goodysnap said: ↑

Yes the TCM will log the faults and store them, as long as nobody hooks up and clears them.

Be careful with universal tools. Sometimes they can clear all modules.
Click to expand...

I'm going to go ahead and check with the nearest dealer in the morning to get it checked out.

I do appreciate your feedback on this.

MicksRule · Mar 7, 2023

Goodysnap said: ↑

Yes the TCM will log the faults and store them, as long as nobody hooks up and clears them.

Be careful with universal tools. Sometimes they can clear all modules.
Click to expand...

Got another question for you.

Would there be any way to get a chassis wiring diagram for my truck? It's an earlier build '19. It does not have the new style eld connector in it.

I'm getting the feeling I'm being bullshitted about my truck in a local Peterbilt shop. I have it there for that trans problem and for no power to the truck side pigtail center pin.

Also, would you happen to know of any common areas where the chassis harness may short or open circuit?

Goodysnap · Mar 7, 2023

MicksRule said: ↑

Got another question for you.

Would there be any way to get a chassis wiring diagram for my truck? It's an earlier build '19. It does not have the new style eld connector in it.

I'm getting the feeling I'm being bullshitted about my truck in a local Peterbilt shop. I have it there for that trans problem and for no power to the truck side pigtail center pin.

Also, would you happen to know of any common areas where the chassis harness may short or open circuit?
Click to expand...

Please send PM with last 8 and your e-mail.

MicksRule · Mar 7, 2023

Sent. I appreciate it.

Coma1 · Jul 16, 2023

MicksRule said: ↑

2019 579. After sitting overnight air bleeds down to nothing. I'll run the air up. The last few mornings I will have a trans fault warning and it may or may not go into gear initially. I will shut the key off once or twice and the warning will go away and the trans will shift normal. I will also add it's been at or below freezing.

Here's my main question for those that may have an idea what might be going on with this. I'm supposed to pick up a 44k lb load first thing Monday morning headed to Texas. Would you risk running it until you can get home or blow off the load and get it to the nearest shop? Nearest shop is less than 10 miles. Load delivers east Texas 30 miles from a place I call my second home, but is 2300 miles away.
Click to expand...

MicksRule said: ↑

2019 579. After sitting overnight air bleeds down to nothing. I'll run the air up. The last few mornings I will have a trans fault warning and it may or may not go into gear initially. I will shut the key off once or twice and the warning will go away and the trans will shift normal. I will also add it's been at or below freezing.

Here's my main question for those that may have an idea what might be going on with this. I'm supposed to pick up a 44k lb load first thing Monday morning headed to Texas. Would you risk running it until you can get home or blow off the load and get it to the nearest shop? Nearest shop is less than 10 miles. Load delivers east Texas 30 miles from a place I call my second home, but is 2300 miles away.
Click to expand...

Coma1 · Jul 16, 2023

Hello ,am having this same issue right now on my 2019 Kenworth W990.What was causing that.Was it fixed?If so was it under warranty since the Eaton Endurant transmission is 5yrs/750K.

MicksRule · Jul 19, 2023

Coma1 said: ↑

Hello ,am having this same issue right now on my 2019 Kenworth W990.What was causing that.Was it fixed?If so was it under warranty since the Eaton Endurant transmission is 5yrs/750K.
Click to expand...

Wasn't fixed. Once I got out of the freezing wheather, the problem went away never to be seen again. There were some low voltage codes, according to the dealer, and they could never verify the actual problem.

Coma1 · Jul 19, 2023

Okay thanks for the reply

Roy Ande · Oct 29, 2025 at 12:00 PM

MicksRule said: ↑

2019 579. After sitting overnight air bleeds down to nothing. I'll run the air up. The last few mornings I will have a trans fault warning and it may or may not go into gear initially. I will shut the key off once or twice and the warning will go away and the trans will shift normal. I will also add it's been at or below freezing.

Here's my main question for those that may have an idea what might be going on with this. I'm supposed to pick up a 44k lb load first thing Monday morning headed to Texas. Would you risk running it until you can get home or blow off the load and get it to the nearest shop? Nearest shop is less than 10 miles. Load delivers east Texas 30 miles from a place I call my second home, but is 2300 miles away.
Click to expand...

2019 LT 625 Endurant HD 12spd. I just found out, that any Auto transmission, the air dryer cartridge should be replaced every six to prevent contamination smh. Dealership does not advise on this.

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