Tl* the contact owns a 2016 gmc sierra 1500. while the vehicle was stationary, the driver's seat became loose and shifted towards the steering wheel after shifting gears. sunrise pontiac in memphis, tennessee was made aware of the failure and updated the firmware in the vehicle. the manufacturer was not made aware of the failure. the failure mileage was approximately 60,000.
Constant vibration and or shake at speeds between 60-70 mph. this issue is commonly referred to as the "chevy shake" this issue has been existing since first purchasing this vehicle. i addressed the concern with the dealership during multiple visits for service. as this was my first full size truck, i wasn't sure what to expect regarding how the vehicle would ride at highway speeds. i was told by the service department that the vehicle was in tolerance in regards to how it rode and the constant vibration. so i excepted this as being the norm and went ahead to add some modifications to my truck. since the initial complaint the service department has since turned over most of their staff and added people willing to address and acknowledge that my vehicle indeed has this vibration/shake issue. due to the modifications made they will not address or attempt to correct this issue. had i pressed the issue in the beginning and not accepted what these so called professionals had told me to be acceptable maybe i wouldn't be in this predicament. my vehicle has also been in for numerous bucket seat issues from sagging and poor seat support. everything described here is factual as i have all the service records and history with the same gmc dealership and service department in regards to these problems. long story short, these issues have made long distance trips almost unbearable between the constant shaking and poor seat support.
Rear bench seat headrests do not stay locked in position when raised. leaning head back onto headrest causes them to lower which could result in injury to the base of the neck or head during a crash. also, headrests are too low for full size adults to adequately protect the head/neck from hitting glass rear window during hard stop or crash. took vehicle to dealership to investigate. dealer indicated all 2016/2017 model trucks on their lot function this way. asked to report it here. rear seat headrests need to be recalled to allow for a locking mechanism to be installed. rear seat headrest design needs updated to increase back of head/neck protection heights during crash.
The driver seat does not go up and down.this is a big safety feature purchased new i can barley see over steering wheel why would you make seatslike this