GMC Acadia Forum banner

1 - 20 of 26 Posts

·
Registered
Joined
·
10 Posts
Discussion Starter #1
I have a 2019 SLT1 FWD with approximately 28k miles.

When driving on any type of incline, between the speeds of 40 and 70 mph, I will get sporadic engine reving. It is not happening in cruise control. It is also something I am not able to duplicate by reving the acceleration pedal. A co-worker believes it is a speed sensor.

I had it in a dealership for another type service and told them about it, but they said they have not been able to duplicate it. It is becoming more frequent over time.

This is a share file link on Google to see a short video of it; 20201018_153527.mp4

I appreciate any input
 

·
Super Moderator
Joined
·
20,546 Posts
Are you able to duplicate the condition "at will?" If so, you should take the service center's shop foreman/supervisor for a ride and show them what the vehicle is doing and how to make it happen.
 

·
Registered
Joined
·
10 Posts
Discussion Starter #3
No, in fact, I have taken and erased a lot of videos where it starts, I put my phone on video, and then it stops.

I am going to show the video (and a bunch more) to GMC, but I was hoping I could find someone who had encountered the same issue before I try it again at the dealership.
 

·
Super Moderator
Joined
·
20,546 Posts
Note whatever you can about conditions under which the situation occurs, too. That will be very helpful. "Sporadic" happenings are a real PITA for both owner and fixer.
 

·
Registered
Joined
·
10 Posts
Discussion Starter #6
No, the transmission is not shifting and neither is the 6 to 4 cylinder shift.
 

·
Registered
Joined
·
10 Posts
Discussion Starter #7
We were able to duplicate it at the dealership and the transmission specialist immediately jumped on the torque converter. They have the parts on order.
 

·
Registered
2015 GMC Acadia SLT2 w/trailer package
Joined
·
8 Posts
We were able to duplicate it at the dealership and the transmission specialist immediately jumped on the torque converter. They have the parts on order.
Hope that fixes it! I was going to say, My Acadia was doing something similar except at 30-40mph. Took it in today and they said the transmission fluid was low and didn't look great. They did a service on it; flushed and reprogrammed the transmission control module. Moment I started driving I felt a huge improvement, drove to the 30-40mph to duplicate the issue and everything was good. They aren't sure why the fluid was like it was, but I'm going to be overly cautious and redo the flush in 2 oil changes and make sure its normal. Then stick to the "severe" maintenance schedule on everything.
 

·
Registered
Joined
·
114 Posts
Hope that fixes it! I was going to say, My Acadia was doing something similar except at 30-40mph. Took it in today and they said the transmission fluid was low and didn't look great. They did a service on it; flushed and reprogrammed the transmission control module. Moment I started driving I felt a huge improvement, drove to the 30-40mph to duplicate the issue and everything was good. They aren't sure why the fluid was like it was, but I'm going to be overly cautious and redo the flush in 2 oil changes and make sure its normal. Then stick to the "severe" maintenance schedule on everything.
It seems like this would imply a leak of some sort, since it's a closed system?

Sounds like a bigger issue...
 

·
Registered
Joined
·
10 Posts
Discussion Starter #10
Well, they replaced the torque converter and it did nothing to solve the problem. I am still under warranty and a transmission flush before 50k should not be the answer on a closed loop system.

If someone comes up with a possible theory, I would love to hear it so I can discuss it with my dealer.
 

·
Registered
Joined
·
1,076 Posts
How do you know for sure the transmission is not shifting?
All I can hear on the video is the radio.
Have you tried putting the shifter in manual mode to see if it still does this?
I'm thinking it's shifting or locking - unlocking.
 

·
Registered
Joined
·
10 Posts
Discussion Starter #12
Great suggestion. I will try in about 8 days. A kid rear ended me this weekend.
 

·
Registered
Joined
·
1,076 Posts
Great suggestion. I will try in about 8 days. A kid rear ended me this weekend.
Well that sucks! Sorry to hear.
Either way you need to be able to reproduce it at will.
 

·
Registered
2015 GMC Acadia SLT2 w/trailer package
Joined
·
8 Posts
It seems like this would imply a leak of some sort, since it's a closed system?

Sounds like a bigger issue...
Good point. Guess I should look into this more!
 

·
Registered
Joined
·
114 Posts
FYI — there is a recall on certain 2018-2020 Acadias for potential transmission fluid leaks. Could be something to look into if the car isn't a write-off from the accident.

More info here.
 

·
Registered
Joined
·
2,798 Posts
FYI — there is a recall on certain 2018-2020 Acadias for potential transmission fluid leaks. Could be something to look into if the car isn't a write-off from the accident.

More info here.
Your link shows 2019-2020 Acadia, not 2018......unless I"m blind.
 

·
Super Moderator
Joined
·
20,546 Posts
Your link shows 2019-2020 Acadia, not 2018......unless I"m blind.
Appears vehicles without stop/start aren't included anyway.
 

·
Registered
Joined
·
10 Posts
Discussion Starter #19
I got the vehicle back, looks like new. The reving is worse than ever.

In the middle of a "reving" episode, I switched to manual mode on the gear shifting - runs perfect. I duplicated several times with the same result. So there is a distinct difference between automatic and manual.
 

·
Registered
Joined
·
1,076 Posts
Oh, back from accident repair (might have wanted to refresh "back from what" for us old geezers, me, who forgot what happened).
Can you post a video panned further back while this happens? It'd be best to see the conditions you are driving under. Also, turn the radio off.
 
1 - 20 of 26 Posts
Top