DT12 Trans Drops into N when I come to a stop?

813Trucker · Nov 28, 2024

SPN 520970 need help Please don’t know what’s going on truck is going to neutral when i stop

813Trucker · Nov 28, 2024

Wombat63 said: ↑

I have a 2016 Wetsern Star, DD15 with a DT12 in it...
Has been operating flawlessly, until a couple of weeks ago, I started getting overrevving between gears, not a constant issue but on upshifts it would ramp up between odd shifts, no issues on downshifts.

A couple of weeks ago I had to come to a hard stop (Nashville, rush hour!) once I once stopped the trans went into N and beeped at me, I couldn't get it to go into gear, air pressure was perfect, the only remedy I could think of was shutting off the battery for a couple seconds and when I started the truck back up, it shifted perfectly, no issues again for the next 1500miles, the over revving did continue.

Monday, when I was delivering my load, the trans shut down again and I repeated the process of powering off and it worked, this happened almost every time I came to a stop.

I am completely at a loss as to what it could be and would really appreciate any help with the issue.
Click to expand...

Wombat63 said: ↑

I have a 2016 Wetsern Star, DD15 with a DT12 in it...
Has been operating flawlessly, until a couple of weeks ago, I started getting overrevving between gears, not a constant issue but on upshifts it would ramp up between odd shifts, no issues on downshifts.

A couple of weeks ago I had to come to a hard stop (Nashville, rush hour!) once I once stopped the trans went into N and beeped at me, I couldn't get it to go into gear, air pressure was perfect, the only remedy I could think of was shutting off the battery for a couple seconds and when I started the truck back up, it shifted perfectly, no issues again for the next 1500miles, the over revving did continue.

Monday, when I was delivering my load, the trans shut down again and I repeated the process of powering off and it worked, this happened almost every time I came to a stop.

I am completely at a loss as to what it could be and would really appreciate any help with the issue.
Click to expand...

I have same code if you fixed problem could you please tell me what was the problem thanks

Wombat63 said: ↑

I have a 2016 Wetsern Star, DD15 with a DT12 in it...
Has been operating flawlessly, until a couple of weeks ago, I started getting overrevving between gears, not a constant issue but on upshifts it would ramp up between odd shifts, no issues on downshifts.

A couple of weeks ago I had to come to a hard stop (Nashville, rush hour!) once I once stopped the trans went into N and beeped at me, I couldn't get it to go into gear, air pressure was perfect, the only remedy I could think of was shutting off the battery for a couple seconds and when I started the truck back up, it shifted perfectly, no issues again for the next 1500miles, the over revving did continue.

Monday, when I was delivering my load, the trans shut down again and I repeated the process of powering off and it worked, this happened almost every time I came to a stop.

I am completely at a loss as to what it could be and would really appreciate any help with the issue.
Click to expand...

Wombat63 · Nov 30, 2024

It was a hairline crack in the airline input into the control module

813Trucker · Dec 3, 2024

Wombat63 said: ↑

It was a hairline crack in the airline input into the control module
Click to expand...

Thanks a lot bro did they have to drop transmission?

813Trucker · Dec 3, 2024

Wombat63 said: ↑

It was a hairline crack in the airline input into the control module
Click to expand...

Also did you have to replace Transmission Control Module?

KDHCryo · Dec 8, 2024

Air input means just changing plastic air tubing, no need to drop anything, either tranny or ecm

813Trucker · Dec 10, 2024

KDHCryo said: ↑

Air input means just changing plastic air tubing, no need to drop anything, either tranny or ecm
Click to expand...

I have auto dt12 transmission mechanics says you’ll have to drop transmission to replace manual you don’t

Wombat63 · Dec 10, 2024

813Trucker said: ↑

I have auto dt12 transmission mechanics says you’ll have to drop transmission to replace manual you don’t
Click to expand...

I think they will have to, but mine was already out because we thought it was the pin bushing that needed replacing…so I’m not 100%

Log in or Sign up

Forums

Find Trucking Jobs

DT12 Trans Drops into N when I come to a stop?

813Trucker Bobtail Member

Trucking Jobs in 30 seconds

Wait, employers can't reach you!

813Trucker Bobtail Member

Wombat63 Light Load Member

813Trucker Bobtail Member

813Trucker Bobtail Member

KDHCryo Medium Load Member

813Trucker Bobtail Member

Wombat63 Light Load Member

Trucking Jobs in 30 seconds

Wait, employers can't reach you!

Log in or Sign up

Useful Searches

Find Trucking Jobs

DT12 Trans Drops into N when I come to a stop?

813Trucker Bobtail Member

Wait, employers can't reach you!

813Trucker Bobtail Member

Wombat63 Light Load Member

813Trucker Bobtail Member

813Trucker Bobtail Member

KDHCryo Medium Load Member

813Trucker Bobtail Member

Wombat63 Light Load Member

Wait, employers can't reach you!