While driving steady at any speed when rpm was between 1400 and 1700 vehicle vibrated to point was not drivable. The dealer performed SB 17 na168 and vibration is gone and Acadia drives great. We did lose gas mileage and service rep said this was a patch while GMC investigates for a permanent repair. I still haven't heard any news but will ask when I go in for first maintenance service.
2017 Acadia Denali AWD, when maintaining speed at constant levels, if the engine settles around 1600 RPMs there is a significant shudder vibration feeling and sound - it doesn't matter what speed, just when the engine settles around 1600 RPMs. 20mph, 30, 40, 50, and a bit higher. It seems to be potentially when the V6 converts to run on just 4 cylinders or something, at those RPMs.
I'm no technician or engine person. Took to local dealer 4/10/17, around 1000 miles on the vehicle total - they confirmed the vibration, since it didn't seem to be normal to me after a few weeks of driving. They said they tested another similar vehicle on lot - same issue.
Said to drive it still, for a couple thousand more miles and said that my car would 'learn' and adapt to my drive style. I didn't believe that would happen but did as instructed.
A few weeks later, at around 2000 miles total, returned from a 5 hour round trip on non-interstate roads...with close to what I would compare to stress from having ridden in the vibration for pretty much the whole way, constant flat road speeds with the engine settling around 1600 RPMS for most of the trip.
Emailed dealer that the vibration is still there, totally ruining my new car experience, and that I hate driving this because of this vibration. I sent the dealer what I found on an Edmunds.com review from an owner - bulletin PIP5488 about the issue. Dealer called me back and said that the bulletin says GM is aware of this condition and it is currently under investigation by their engineering team. Dealer said to check back mid May 2017 to see if solution.
In the meantime, I am to keep driving it. UGH! Anyone else having any success in fixing this issue?
Update from May 24, 2017: 17-NA-168 bulletin was just released to recalibrate the ECM (that is what the dealer said the bulletin does) computer in the car.
I had mine serviced to apply this 'fix' yesterday. I drove it last night for an hour, and so far, so good.
Please everyone check with your dealer about this bulletin.
This issue has been previously reported in this forum. At certain speeds when the engine goes into "cylinder deactivation" mode (V4 mode), the engine exhibits a fluttering or vibration. The problem feels like somewhat like when you leave your back windows open at high speeds.
- tje2628,
Kimberly, US
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A D V E R T I S E M E N T S
While driving steady at any speed when rpm was between 1400 and 1700 vehicle vibrated to point was not drivable. The dealer performed SB 17 na168 and vibration is gone and Acadia drives great. We did lose gas mileage and service rep said this was a patch while GMC investigates for a permanent repair. I still haven't heard any news but will ask when I go in for first maintenance service.
- Frank L., Chicago, US