13 problems related to seats have been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.
Locking mechanism on front driver seat failed, causing movement of the seat both forward and backwards without warning.
Consumer states when he parked his vehicle he raised the seat. When he got back in the truck the seat kept moving back and forth. The seat will not stop going back and forth. The dealership replaced the track and the parts to the seat. The repairs were made at the owners expense. The seat track was repalced. Updated 12/07/05.
1-seat adjustment 2-seat will not lock in position-slides freely front to back 3-temporarily locked failed piece into usable position-cannot adjust to any other position due to failed plastic block. Researched complaints for 99 GMC Sierra truck and found 10 existing identical failures. These are complaints-566049, 758819, 855016, 862903, 877718, 10020665, 10022698, 10066125, 10074822. I am sure there will be additional complaints under "mirror" vehicles such as Chevrolet and cadilac and other years. I have identified the piece as a plastic block approximately 1 inch wide by 2. 5 inches long with a lever, spring and pin assembly. The "u" portion of this block fails causing the seat to slide freely creating a severe safety issue. This is clearly an unsafe and poor design. I have pieces of broken block for reference and will continue to escalate this as far as necessary for resolution from gm.
The drivers seat adjuster fails to hold the seat from sliding back and forth. I have manual bucket seats and have been told by GMC that there is no records of failures. This has been repaired 5 times by replacing the seat adjuster, all under warranty thus far, but I am concerned that this is a safety issue since if it fails while driving, it allows the driver to be moved forward when brakes are applied.
There is a bar that is at the base of the front drivers seat which comes out at the console. The bar cut straight through the seat. The bar is very sharp, and the consumer was badly cut by the bar .
Son was driving 99 GMC Sierra truck on I-20 in arlington, TX Monday, may 26th when he braked to slow and the front driver seat suddenly lurched forward throwing him into the steering wheel causing him to lose control of the truck. He regained control of the vehicle but was almost rear ended by vehicle. Son and fiancee were unhurt and no damage was done. When they were able to pull over and investigate, the front driver seat would not lock in place. It would move forward and backward without locking into place. Son had to brace his foot against the dash to hold seat in place in able to drive the vehicle home. Serious injury could have been the result if control of the vehicle had been lost. Feel this is a manufacturers defect and serious injury could result if this happened to others or myself since I drive the same identical vehicle.
Seat tracks anchor snapped off, causing driver's seat to fully recline back. Cause unknown. Dealer notified.
I was having trouble moving the drivers front seat forward or backwards, I left it in the foward position as I was driving along a city street ,I came up to a light and the seat anchorage became broken causing me to strick the steering wheel. I feel that if I had been going faster then 25mph I would have gotten hurt worse. I had a factory defect on the front seat belts,which I had taken to the dealer ,I was adviced that the parts were not in and had to be ordered. This was back in November or so to the best of my recllaction. 2-28-2001 I called the GMC customer assistance office spoke with a GMC representative and declare my problem , I wanted this deficiency to be covered under warranty,and I was adviced that it was not. Now what good is the seat belt doing me when the seat will not stay ,I have been using my left foot for support against the brake release that is mounted on the side of the drivers door,it keeps me from going foward at slow speeds what is going to happen if a vehicle in front of me suddenly stops? what good is this type of safety seat belt if the seat will not stay stationary,if this happen to my vehicle I dont doubt it will happen to some one else and mybe they wont be so lucky. Another safety feature that was installed be the manufacture is the antilock brakes, they are also not covered under an extended warranty like the emission system, I feel that the seat and antilock brakes should be more of a safety concern then the emission system. Any information will be kindly appreciated thanks for your time.
Driver's seat moves when applying brakes. Throws driver against steering wheel and unable to control vehicle properly. Dealer will look at the vehicle.
There is a pop/squeak in front over bumps. Replaced front coil springs. Also, driver's seat sits too far/replaced right air deflector.
Front passenger seat rattles. Yh.
Bucket seat tracks pertrude out from under seat creating a safety hazard due to design flaw.
Consumer went to apply brakes and driver's seat slid forward because bolt that catches seat on tracks broke. Dealer has inspected t vehicle.