While vehicle is in foward driving motion on street or highway(20 - 70mph)out of no where, truck will have a quick second halt in its motion, as if someone pulled and released the emergency brake(see attach recording) all I feel is a sudden jerk which its intensity depends on traveling speed. It startles me every time! during this time, the speed gauge drop then resumes regular speed, check engine light appear but immediately turns off as does the words "park assist off" also displays then immediately goes away. These sporadic episode are becoming more frequent and could cause tragic accident. I have made several attempts to have issue dignosed but unfortunately does not generate codes, according to onstar. Dealership was unable to duplicate the issue. However they recommended replacing throttle position sensor, brake lamp switch, spark plugs and wires, master cyl and brake booster, flushing and replacing brake fluid for possible solutions but it did not fix the problem. What I have notice the issue becomes more frequent when there is studden braking(stop and go traffic) followed by increased acceleration. In addition while sitting idle in park for about 10mins with A/C on, truck idles down like it is about to cut off(engine light comes on then immediately off) but doesn't. dealership was unable to duplicate that too. Also after braking for stop light I sometimes feel several thumps as though I'm not putting enough pressure on brake peddle. No matter how much pressure I put on brakes the thumps still sporadically occur. Sometime when this happens it is followed by the first issue I meantioned when driving is resumed (hault, engine light, park assist off warning).

- Charlotte, NC, USA

The contact owns a 2008 Chevrolet Suburban 1500. While driving approximately 60 mph, all the warning indicators illuminated and the check engine light kept flashing. The braking ability seized. The contact had to maneuver to the side of the road. The vehicle was towed to an independent mechanic who diagnosed that the power control module system malfunctioned. The vehicle was not repaired. The manufacturer was notified of the failure. The VIN was invalid. The approximate failure mileage was 150,000.

- Omaha, NE, USA

Brakes do not catch every time. Had them replaced but still have issues where it seems that when your pressing them to slow or stop it takes them a while to catch. Saw where earlier models had brake line issues.

- Providence Village, TX, USA

Purchased the truck in March 2013 with approx 63K miles on it. In November 2013, stabilitrak warning came on. Took to Chevy dealer who replaced spark plug and new battery. In January 2015, stabilitrak warning light on again. Took truck immediately to dealer who hooked it up for diagnosis but did get any results. Light did not come on again until 9/8/15 when I was driving 70 mph on a highway. Service stabilitrak/service traction control/ABS all lit up. Strange noise coming from right front tire area when I attempted to slow down to pull off the highway, had no brakes. Pedal literally went to the floor. Luckily there was an incline so my vehicle slowed enough to allow me to get off the highway. Pulled off onto an emergency area just past the toll booths and had to use my emergency brake to stop. Luckily, I didn't have my 4 small children with me like I usually do. Now the extended warranty company is trying to deny my claim for repairs saying that the rust was the cause. I had the vehicle looked at by a certified authorized dealer who didn't notice the rust and I also had the truck inspected in July per MA law for safety and emissions and there was no mention of rust even though they do a pretty thorough inspection yet I, the consumer, am at fault when my wheel rips apart from the hub while traveling 70 mph"!? this is obviously a huge problem. People in the northeast drive SUVS -and come into contact with salt every winter. Isn't that the point of having an SUV?!". never again will I buy a GM and I will be sure to tell anyone and everyone I know to avoid them as well. Shame on GM for putting consumers in potentially life-threatening situations because of the obvious use of inferior materials. I hope the NHTSA takes a really close look at this problem and force GM to address it.

- Walpole, MA, USA

I purchased this car in May 2013 with 76,000 miles as a certified used vehicle from a GM dealership in NJ. I noticed on test drive brake vibration from the front. Before I picked up the vehicle they replaced new rotors and ceramic brake pads. Now at 17,000 miles later there is vibration again, once again the rotors are warped but the pads are perfectly fine. The service manager told me and I quote "it must have been a hot day and you took the car through a car wash warping the rotors." If GM is making their rotors with non-virgin steel this can happen. I have previously owned a 2005 Suburban with 100,000 miles, the rotors never warped and I only needed them changed once at 55,000 miles, I have a light foot. In 2010 I changed my 2005 Suburban for a 2009 Buick enclave this car was the first time I noticed in the 3 years of ownership that I needed rotors twice, in 3 years I had only put 30,000 miles on the car, so that lead to the purchase of the 2008 Suburban. I can't help but believe there is something wrong in the making of their rotors, they changed manufacturer maybe?? with this 2008 Suburban I have also contacted them with no answer or reply to the fact when my 12 year old son who weighs 108lbs sits in the front passenger seat the passenger air bag light is on one minute and then off the next minute. Sometime I can put my purse and a gallon of milk on the passenger seat and the air bag light is on will display. Yet my 108 lb child or my 86 lb child the air bag light will go from on to off. So they are my two safety concerns, the rotors warping repeatedly and the air bag light not working properly which GM has refused to comment on. Thank you. Updated 1/16/15

- Sparta, NJ, USA