Allison 6sp: cant get into FWD

[cdbright]

so from time to time i wont be able to shift into FWD, i get R and N and Park but need to shut off and restart a couple times to get it. Once i have it it shifts fine. The last time i pulled power and did a reset and it was fine, now it is back again, i assume this is a tuning issue in my current tune? I have a CEl that wont go away but i think it was from when i had a bad seal on my fuel filter and had a low fuel pressure code. I am going to get everything cleared next week and may try some new tunes from Industrial Injection since i will be there anyway.

i imagine my tune is messing with the TCm and that is what causes this? It seems like the linkage is screwed up but after a restart or reset it works fine.

 

[NC-smokinlmm]

so from time to time i wont be able to shift into FWD, i get R and N and Park but need to shut off and restart a couple times to get it. Once i have it it shifts fine. The last time i pulled power and did a reset and it was fine, now it is back again, i assume this is a tuning issue in my current tune? I have a CEl that wont go away but i think it was from when i had a bad seal on my fuel filter and had a low fuel pressure code. I am going to get everything cleared next week and may try some new tunes from Industrial Injection since i will be there anyway.

i imagine my tune is messing with the TCm and that is what causes this? It seems like the linkage is screwed up but after a restart or reset it works fine.

Mine did that when it broke a snap ring, better check the fluid or drop it and split it and take a look before it explodes.

 

[cdbright]

Mine did that when it broke a snap ring, better check the fluid or drop it and split it and take a look before it explodes.

really???? it happened a few months ago back in CA and i did the batt reset and it was fine for a long time and she has had the wheels drove off her out here in SLC at elevation on GUYs big stock tune for a while:happy2:

 

[cdbright]

maybe i just answered my own question hahahahahahah

 

[NC-smokinlmm]

Mine drove and acted fine for a year or so, then huge bang and nothing.

 

[cdbright]

Mine drove and acted fine for a year or so, then huge bang and nothing.

Why is a battery reset fixing it you think? did yours seem to be better after a reset?

 

[Chevy1925]

Why is a battery reset fixing it you think? did yours seem to be better after a reset?

you did it one time many miles ago, have you tried it since? may not fix it now

 

[Mike L.]

Why not hook up a Tech 2 and see what is going on?

 

[cdbright]

yes i did the reset last night and all is good again, i will have access to a tech 2 next week and will see what it says, i guess worse case scenario is Mike L will may be receiving a pallet delivery.:woott::woott::woott:

 

[Chevy1925]

yes i did the reset last night and all is good again, i will have access to a tech 2 next week and will see what it says, i guess worse case scenario is Mike L will may be receiving a pallet delivery.:woott::woott::woott:

oh your talking about the trans. "FWD" was throwing me off. first i thought you meant "front wheel drive" and figured there is no way you meant that. then i figured you meant "four wheel drive". Now i see you mean "forward" lol.

tech 2 would be best then

 

[Mike L.]

yes i did the reset last night and all is good again, i will have access to a tech 2 next week and will see what it says, i guess worse case scenario is Mike L will may be receiving a pallet delivery.:woott::woott::woott:

Doubt you have an internal problem. Tech 2 may not tell you anything if the TC is working. Wait till it acts up and then do the tests.