2015 gmc seirra transmission codes

[Adam33]

I have two transmission code on my 2015 gmc seirra, P0700 and P0741. I had an appointment at the dealership  2 weeks ago and a day before the codes went away. I bought it there anyways thinking tbe codes are stored, all they done was a fluid change, which I needed done anyways.  The codes came back yesterday. So basically what the  truck is doing is sometimes the rpms  run high before changing . It seems it happens when the truck warms up. I done some research and could be several things between dirty fluid, wiring,  and transmission control module ( tcm) , solinode value.  Just wondering if anyone came across this issue,  thanks  in advance.  Any help would be appreciated 

[CamGTP]

My opinion is that it needs a torque converter.

Depending on mileage of the truck it probably should have the rest of the transmission gone through as well.

[Adam33]

Forgot to mention, when the mechanic did the fluid change he said the torque converter looked good.  There was no shavings in the old transmission fluid 

[Adam33]

And about 90,000 miles

[CamGTP]

That P0741 code still points at torque converter failure.

[newdude]

P0741 is Torque Converter Clutch Performance/Stuck Off.  

 

Trans has to come out of it.

 

When they changed the fluid, did they do a flush/exchange?  Or did they actually drop the pan?

 

Also, the tech couldn't have "looked" at the converter and said "yep its good".  Its a welded together item.  

 

At a minimum, and if you are lucky, you will need just a new converter.  The problem is, if the converter has been going over time and is just now setting codes, then there will be converter clutch debris in the trans and in the pan.  So expect a converter, new pump housings if they are scored, new valve body and TEHCM (the TCM and solenoid control assembly), possibly some other clutches like 4-5-6 clutches.  

 

No matter what repair gets done, do the transmission thermostat pill flip, the SureCool delete kit or the new lower temp thermostat from GM to drop your temps.  

Edited November 21, 2021 by newdude

[BlaineBug]

16 minutes ago, newdude said:

P0741 is Torque Converter Clutch Performance/Stuck Off.  

 

Trans has to come out of it.

 

When they changed the fluid, did they do a flush/exchange?  Or did they actually drop the pan?

 

Also, the tech couldn't have "looked" at the converter and said "yep its good".  Its a welded together item.  

 

At a minimum, and if you are lucky, you will need just a new converter.  The problem is, if the converter has been going over time and is just now setting codes, then there will be converter clutch debris in the trans and in the pan.  So expect a converter, new pump housings if they are scored, new valve body and TEHCM (the TCM and solenoid control assembly), possibly some other clutches like 4-5-6 clutches.  

 

No matter what repair gets done, do the transmission thermostat pill flip, the SureCool delete kit or the new lower temp thermostat from GM to drop your temps.  

 

If you don't ask for it specifically I'm 99% sure they don't drop the pan for a normal transmission fluid service.  I asked a service writer at a local dealership.  I believe it was around $200 or so for a transmission fluid flush, but that didn't include anything involving pan removal.  So I did it myself, 2 gallons of the appropriate ACDelco fluid, filter, brake cleaner, and plenty of paper towels.  Exhaust didn't have to come out either, followed the tips here about making gentle clearance with a scissor jack.

With that being said I do remember what seemed like all of the 2016-2016 truck and SUV models having the issues with their torque converters.

Edited November 21, 2021 by BlaineBug

[Adam33]

He dropped the pan, I know that because he wanted permission to do so. He said everything looked good.The code that  stays is p0700, the p741 is pending and comes and go.

[CamGTP]

P0700 just points to a general fault and not a direct fault. That code just means there is a problem. If the other code is a P0741, that is the direct fault and likely the cause of your whole issue with the transmission.

 

Torque converter failures are one of the most common issues with the 6L80e.