2011 Buick Lacrosse Vehicle speed control Problems

“I noticed this problem not long after getting car when stopped in drive going from brake to gas car seems to act like its on oil slick then catches on with a sudden jerk. It will also when going from gas to brake even on incline will lunge forward it also will just suddenly speed up with out any acceleration its like the car is in cruise control. I have had car in several times and always they cant tell me anything I'm not the only person who notices this anyone who is in car asks what was that or what just happened.”

“Driving 60 MPH on the highway. Suddenly the information panel flashed stabilitrak service required (or similar) then low power mode. Car went from 60 to 30 MPH on the highway. Unable to speed up. Needed to pull over to the side of the road. Turned car off. Tried to restart and it wouldn't restart for several tries. Restarted and still said low power and was idling low. Tried again and was normal. This has happened several more times and always is similar. Sometimes it doesn't happen at all in a 30 mile trip, sometimes it happens 3 times. Very dangerous! Could be rear ended! …”

“The vehicle started to voluntarily come to a stop, and cut itself off without notice. Then, subsequently, the battery light/icon started to appear onto the dash screen, followed by a deceleration while driving with an information notice stating that the battery power had been reduced. With this notification your ability to accelerate becomes hindered, and having consulted with on-star, a diagnostic test resulted with a code of p-0335, and the problem listed as an ignition system engine misfire. Such diagnosis comes with a warning of speed precautions, and highway driving is not recommended.”

“While turning left at a major intersection, car lurched forward and gained speed/momentum while at same time steering wheel became stiff and very difficult to turn & driver could not control the car. Car did not complete the left turn but rather continued driving as if all on its own and crashed into a high curb on right side of car. Air bags did not deploy; front car parts simply crumbled and fell off; suspension was ruined; car tire was punctured along with the tire rim being cracked clear through in a couple of areas. Driver was injured with head injury, cracked rib, and broken rt. Forearm. …”

“Sudden and unexpected acceleration during a low speed (<5 MPH) tight left hand turn. First incident resulted in crash against house wall, damage to vehicle. Vehicle repaired below insurance deductible, no damage to structure. Second incident in a parking lot, on or about may 16, 2012, able to stop vehicle with no crash. Third incident occurred at neighbors house june 26, 2012, causing crash. Damage to vehicle and garage door. All incidents occurred when lifting from accelerator prior to stepping on the brake to shift into reverse (vehicle still in drive, no braking). …”