Sorry if this seems long winded but I want to provide as much info as possible.
Just picked up a 2019 Silverado 1500 custom. Has the 4.3 V6 with the 6 speed transmission (6L80 I believe)
The truck had 99 miles on it. Currently around 2500.
No issues out of the gate, after about a week of driving I noticed a very delayed shift I think it was from 1-2 or 2-3. The engine revved 1-2k high RPM than normal before shifting.
a few days later while on the highway (cruise set at 75mph) out of no where the RPM’s spiked as if it had downshifted. There was no additional load on the engine to cause this, like going up or down a hill. This happened a few times.
I called the dealership immediately and brought the truck to them a few hours later. Got a loaner for a few days while they looked over it.
They called me to come pick it up, said the tech noticed a little bit of rough shifting and said they “re-set” the shifting points. Since it was an intermittent problem for me I don’t think it arose for them.
So I took the truck home, no problems. My wife drove it to work that same night and the same problem happened again. This time the engine light came on.
I scanned the codes this morning and the ECM showed P0700 (transmission control system
the TCM showed P2714 pressure control solenoid D performance/stuck off.
So back to the dealer it goes, waiting for them to bring me a loaner this time.
I was was told by a dealer technician that GM has been having them put a different type of transmission fluid in some of these trucks due to issues with the torque converter. But I guess if a solenoid is stuck it could be due to a fluid issue as well? Just speculating.
I’m curious if anyone else has had similar issues. I haven’t had much luck finding anyone else online with the same problem. Which is guess is more of the reason I’m posting this, in case there’s someone else lost like myself. I will keep this updated when I get further down the road with the dealership.
I get that there are fluke problems that can arise, but this is a bit irritating considering it’s a brand new vehicle. I will say that the dealership I’m working with has been extremely supportive and not trying down play anything I’m complaining about.
UPDATE More issues. According to dealer notes... “found code P2714. followed document 5118349 and determined transmission fluid pressure OK. determined sticking solenoid #4 inside control assembly. replaced control assembly. programmed and set up TCM. Program code 18YN25983767. filled and adjusted fluid level. flushed and flow tested cooler. road tested several times. drove/shifted fine no codes returned.” I picked up the truck. Drove for about 27 miles and it started the same problems as before including check engine light. Got home, about another 11 miles and scanned for codes and got the same one as before. I did the math on the mileage when I got home and it seems as though it was only driven 13 miles while they had it. Not sure if that matters. If you add that to my 38 it’s 51 and isn’t that around the miles the ECM usually needs to re run most of it’s tests? Anyways, waiting on yet another loaner to be dropped off, let’s see where this goes this time...
