“Service transmission Now, unable to shift soon” Message

[BigE_N_TX]

Hello All,

 

I received this very odd message on my Wife’s 2021 Tahoe this afternoon and was curious if anyone has seen this on your 2019 up Silverado’s or Sierra’s who have the 10 speed transmission ? If so, how did you address it?

 

the only strange thing is the weather is at 15 degrees today, I have had cold weather play games with an old Silverado I had. Any logic to this you think?

 

I am just trying to get insight from someone who had this issue or maybe a GM tech as the mileage is 63,000 (3,000 out of powertrain warranty). 
 

Thank you for the help!

[Mshawn]

I guessing here but I think you could be right about the weather. These transmissions software are adaptive learning and it being a huge change in weather might have it where it change in what its use to seeing from the driver. I know extreme weather can affect a lot of things. 

[BigE_N_TX]

10 minutes ago, Mshawn said:

I guessing here but I think you could be right about the weather. These transmissions software are adaptive learning and it being a huge change in weather might have it where it change in what its use to seeing from the driver. I know extreme weather can affect a lot of things. 

Good thoughts there @Mshawn This cold is definitely an occurrence here that I can count on one hand (and still have fingers left), so this is why my mind went that way. However, I don’t want to ignore it either if it is due to something serious, hopefully there will be someone to come across this who has seen this message before and provide some feedback.

[Mshawn]

I’m interested in this as well. Knowing what I know about the electronic in these vehicle and adaptive learning, I’ve seen a lot of weird things in vehicles. Also this may be the nature of your trucks adaptive  learning but the same identical vehicles be just find.

[Bikerjon]

4 hours ago, BigE_N_TX said:

Hello All,

 

I received this very odd message on my Wife’s 2021 Tahoe this afternoon and was curious if anyone has seen this on your 2019 up Silverado’s or Sierra’s who have the 10 speed transmission ? If so, how did you address it?

 

the only strange thing is the weather is at 15 degrees today, I have had cold weather play games with an old Silverado I had. Any logic to this you think?

 

I am just trying to get insight from someone who had this issue or maybe a GM tech as the mileage is 63,000 (3,000 out of powertrain warranty). 
 

Thank you for the help!

Can you scan the Tahoe for codes? Generally "Service Now" means shut down to prevent further damage. I would get that truck to a dealer now.

[silveradosid]

at 63k miles you should service the tranny anyways.

[BigE_N_TX]

2 hours ago, silveradosid said:

at 63k miles you should service the tranny anyways.

Wow what a helpful reply @silveradosid that solves my problem!

 

the maintenance schedule states at 45,000 miles:

• Automotive filter replacements
• Transmission fluid exchange service
• Change of the transfer case fluid
• Inspection of the evaporative control system

and at 90,000 miles:

• Transmission, brake, transfer case, and oil fluids replacements
• Inspection of the evaporative control system
• Spark plugs tested and replaced

as my original post stated, any tech’s or individuals who has encouythis message please chime in….. 

[silveradosid]

as Bikerjon stated, this problem can be caused by several different things. no tech is going to give you the magic answer. cold weather can cause seals to leak and low pressure in the tranny, solenoids to stick and other problems. no magic answer here, get it scanned and go from there

[Grumpy Bear]

2 hours ago, silveradosid said:

as Bikerjon stated, this problem can be caused by several different things. no tech is going to give you the magic answer. cold weather can cause seals to leak and low pressure in the tranny, solenoids to stick and other problems. no magic answer here, get it scanned and go from there

 

ACDelco Drexron VI -40C/F viscosity 11,500 cP Group III

Red Line D6              -40C/F viscosity  4,500 cP Group iV

 

Another reason I run PAO based transmission fluid. -28 F is the coldest I've seen with Pepper and she shifts fine. 

 

Proof: 

 

ACDelco-Dexron-VI-Full-Synthetic-Trans-Fluid-Sell-Sheet.pdf

 

D6_ATF_PROD_INFO.pdf (redlineoil.com)

 

 

Edited January 16, 2024 by Grumpy Bear

[alexcary5]

Receiving a "Service transmission now, unable to shift soon" message indicates a potential issue with your vehicle's transmission system. It's essential to address this promptly by consulting a qualified mechanic or contacting roadside assistance. Ignoring transmission problems could lead to further damage or safety hazards on th

 

 

 

[redwngr]

Don't put Dex Vi in your 10 speed.

 

[Frankielozano214]

Wondering what the outcome of this msg was, I’m in same situation first time it’s been 27 degrees over here since I’ve gotten the truck. Truck only has 12,****** miles on it so might take to dealer. 

[Dan H 2023 HC]

Sorry for the bad news, Frankie, but mine - and evidently many others, failed in much warmer temps. See this thread. 

 

[Frankielozano214]

2 hours ago, Dan H 2023 HC said:

Sorry for the bad news, Frankie, but mine - and evidently many others, failed in much warmer temps. See this thread. 

 

Well I just started my truck drive few miles the msg hasn’t popped again, how many time did u see that msg before it actually messed up so started see problems?

[Dan H 2023 HC]

Mine started having problems the moment that message appeared, and the trans was obviously not shifting correctly.