Limp mode???

[Jared Miller]

2018 chevy silverado 1500 with less then 110,000 miles on it. Truck gets up to around 33 mph then goes into neutral. Once it slows down to around 25 it'll let me speed back up to 33 then back to neutral. Thought it was my rear speed sensor. Got it replaced and it's still doing it. Any ideas? From the research I've done everything is pointing to the transmission is going out of it. Any help would be appreciated. 

[newdude]

19 minutes ago, Jared Miller said:

2018 chevy silverado 1500 with less then 110,000 miles on it. Truck gets up to around 33 mph then goes into neutral. Once it slows down to around 25 it'll let me speed back up to 33 then back to neutral. Thought it was my rear speed sensor. Got it replaced and it's still doing it. Any ideas? From the research I've done everything is pointing to the transmission is going out of it. Any help would be appreciated. 

 

 

What's the transmission temps when its doing this?  If you see it way beyond 210F and climbing, transmission is gone.  Torque converter, pump and possibly more.  

[Jared Miller]

54 minutes ago, newdude said:

 

 

What's the transmission temps when its doing this?  If you see it way beyond 210F and climbing, transmission is gone.  Torque converter, pump and possibly more.  

It's staying around 180-190

[rlcole321]

Have you tried to shift it manually?, have you look at the fluid, is it burnt or dark colored?.

[Jared Miller]

10 hours ago, rlcole321 said:

Have you tried to shift it manually?, have you look at the fluid, is it burnt or dark colored?.

Yes, it shifts fine manually. Fluid looks good. 

[rlcole321]

well if it shifts ok manually then sound like a TCM issue, may need to "Reflash" a program to the TCM, if it shifts ok in manual mode then the hardware should be fine.