Allison 6sp: Help please.

[Bosox89]

Had the big tune on taking someone for a ride today and it the trans is limping? It starts to shift into second and seems to get hung up, then locks in gear and throws codes p0700 and p2724. Turned it off and cycled keys and cleared codes a couple of times and is continues to do it. Any advice on what it could be doing?

 

[Mike L.]

Stock trans?

 

[Bosox89]

Suncoast stage v

 

[MACKIN]

So it shifts from second after it hangs up into third then what stays in third ? Hows it shift when you turn down the power normal? Need to do some more self diagnostics to help figure out

 

[Bosox89]

I'm not even sure it's making it into second. You could hear it, it throws the codes, and then it feels like it downshifts back into first maybe? I put it back on stock tune and it does the same thing.

 

[Bosox89]

Also, while the cel is on, when you put it in reverse or drive it goes into gear very very hard.

 

[MACKIN]

Hard to say sounds like everything was normal you loaded in a big tune and then all hell breaks lose?

Weird

 

[Mike L.]

Check speed sensors.

 

[Bosox89]

How exactly do you check the speed sensors mike? Do you have to go through a dealer to get them if they are bad?

 

[Mike L.]

How exactly do you check the speed sensors mike? Do you have to go through a dealer to get them if they are bad?

Need a Tech 2 or maybe EFI. You will want to run a scan and look for drop outs or glitches as the numbers increase and decrease.

 

[Bosox89]

Hey mike, you've got a pm.