While driving, the horn failed to activate when depressed. Subsequently, when parked, the horn required excessive pressure to activate (two hands). Took the vehicle to the dealer, the service advisor tried the horn and agreed that it required excessive force to blow the horn. P/N 84050792 was replaced with no change in the pressure required to blow the horn. Research shows multiple complaints regarding the same issue.

- Simpsonville, SC, USA

New 2017 GMC Acadia denali fwd. Less than 100 miles. Horn does not operate with normal driver pressure under any conditions. Requires excessive pressure to operate, requiring using both hands and then only in one spot. GM is aware of the problem and has done nothing to correct, calling it is operating "as designed". the design is flawed and GM fails to admit it and take corrective action. It is past time that this problem is fixed, as it has been reported many times by other GMC Acadia owners and is on record with the NHTSA. Does someone have to be killed before a fix is released" does someone have to be killed before the NHTSA acts on this potentially lethal defect"

- Lewes, DE, USA

The horn is very hard to honk. It takes my wife both hands to activate the horn. I have seen similar complaints on the computer. I have been back and forth with a GM representative for about 5 moths and have gotten nowhere. They apparently do not see this as a safety concern. I do. I have taken the car back to the dealer and they said they adjusted the horn, but there was no improvement. We checked 3 other Acadias on the lot, and they all had this problem.

- Newark, IL, USA

Horn will not honk unless excessive pressure is applied. It takes 2 hands to honk the horn. I have never seen a horn that required more than 1 finger to honk.

- Newark, IL, USA

I bought a new 2017 GMC Acadia denali the end of February and the next day found out that the horn does not work. The horn is extremely hard to push and requires extra pressure with both hands and arching my back against the seat to try and make the horn to work. I have been back to the dealers 3 times in 2 weeks and it is not fixed. There are only 644 miles on this new SUV and my wife will not drive it because it is a safety concern with no horn.

- Hatfield, PA, USA

Horn has not worked from day one. Dealer says can't fix until GM redesigns a solution. Sad.

- Eastport, ME, USA

The contact owns a 2017 GMC Acadia. The contact stated that the horn took excessive force in order to operate. As a result, the vehicle was involved in an side impact collision because the driver could not alert the other driver of their presence. A police report was not filed. The vehicle was taken to the collision center where it was repaired. The contact was also informed by the dealer that this failure was common among this particular model vehicle. The manufacturer was notified of the failure. The manufacturer stated that the vehicle was designed with that particular failure. There were no injuries. The failure mileage was approximately 600.

- Sherman Oaks, CA, USA