P0872

[colorado.dmax]

New spin on filter, new internal filter and 2 drain and refills and still having issues.

Driving home on the highway trans temp will get up to 170* and when I get off the highway and the trans downshifts to fourth it throws this P0872 code and goes into limp mode. I can park the truck, clear the code, run into a store for a minute and once the transmission cools off below 170* it won't throw the P0872 code.

Any reason why I'm only throwing the P0872 code when the transmission reaches 170*?

 

[Mike L.]

How about some info?

 

[colorado.dmax]

Sorry

05 LLY
Trans was built 2.5 years ago (roughly 50k miles ago) by Tony at All Season. Goerend converter. Your trans cooler.

 

[colorado.dmax]

Truck will only throw the code once you start downshifting. Truck will drive fine in 5th with converter locked at 170* +. It's only when the truck downshifts to fourth at higher temps that it throws the code.

 

[Mike L.]

Drop the pan and switch the E and D solenoids. They are the 2 center solenoids between the A&B trim and F trim. See if it changes codes. You may also have a bad internal harness.

 

[colorado.dmax]

Will do. Thank you.

Was doing some reading and came across a post of yours on dieselplace stating "Disconnect main harness connecter at back of trans and see if there is fluid at the pins. You need to squeeze the connecter at 3:00 and 9:00 and wiggle to get it off. Make sure the key is off otherwise it will set off a bunch of codes." And that the internal harness needs to be replaced if there is fluid at the pins. Is this correct?

The D and E solenoids are interchangeable and the truck will drive fine?

 

[colorado.dmax]

Also I'm assuming if I swap the solenoids and the code follows it's a bad solenoid? If not then it's more likely debris in the bore?

 

[Mike L.]

Also I'm assuming if I swap the solenoids and the code follows it's a bad solenoid? If not then it's more likely debris in the bore?

Correct.

 

[colorado.dmax]

What would be the best way to clean out the bore?

 

[Mike L.]

What would be the best way to clean out the bore?

Do you think the debris will go away with cleaning the bore? Not in this life time.

 

[colorado.dmax]

Meaning? There's debris coming from somewhere and it's just going to come back?

 

[Mike L.]

Meaning? There's debris coming from somewhere and it's just going to come back?

Yes.