2012 Chevrolet Sonic power train problems

“The contact owns a 2012 Chevrolet Sonic. The contact stated that on several occasions, while coming to a stop, the vehicle unexpectedly remained in second gear. There were no warning lights illuminated. The contact stated that several attempts were needed for the vehicle to shift into another gear. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for additional assistance. The failure mileage was approximately 77,000.”

“The contact owns a 2012 Chevrolet Sonic. The contact stated while driving 75 MPH, the vehicle lost power. The check engine OBD reader had lost communication with the transmission. The contact merged to the side of the road. The contact then went to auto parts store and attempted to change the speed sensor; however, the parts store had given the contact the incorrect part. The dealer was contacted and informed the contact that the vehicle was already repaired under NHTSA Campaign Number: 14V315000 (POWER TRAIN). The vehicle had lost throttle and power. The contact then took the vehicle to an independent mechanic who diagnosed the vehicle and linked the failure to NHTSA Campaign Number: 14V315000 (POWER TRAIN). The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 86,000.”

“While driving on the highway late at night, at approximately 60 mph my 2012 Sonic began to lose power and slowed to a dangerously low speed when there was nowhere for me to pull over! I literally had to coast to a spot that I could barely squeeze off the road! Then would not shift into any workable gear but 1st and after that just revved up loudly. Long story short…had to be towed 35 miles home. Then towed to a reputable garage where they concluded the transmission was shot at about 90,000 miles. Would be around $3800. to rebuild. Come to find out these cars are known for this problem! And yet somehow I’m being told by GM that it’s not included in the Turbine Shaft Fracture Recall for that car’s year/make/model!! WHY?! Needless to say….the car will be junked!”

“01.24.2023 Purchased Chevy Sonic 2012 three weeks ago (12.27.22) w odometer at 33,688 and manuf. date of 03/2012. It has multiple recalls, inc transmission, that GM has reported resolved. I have had to schedule a transmission rebuild for $3,200.00 in February. After pressing on gas pedal, the vehicle hesitates as though it is going to stall, then lurches forward. On open road it will buck. When slowing down to stop or make turns, it bucks and lurches. The problems duplicate those stated in almost all of the complaints reported on this site. If GM has reported this vehicle as properly repaired, then I am stuck. Also, the questionable low mileage of a ten year old vehicle and dates of the recalls make me wonder about where and when or if all the recalls were truly resolved. There is one accident reported on this vehicle, Sept. 2022; was the accident caused by the same powertrain related problems?”

“THE AUTOMATIC TRANSMISSION FAILED. IT FAILED WHILE I WAS DRIVING THE VEHICLE. YES, IT WAS CONFIRMED BY A DEALER. IT HAS BEEN INSPECTED BY THE CHEVY DEALER. NO, THERE WERE NOT ANY WARNING SIGNS PRIOR TO THE FAILURE.”

“The contact owns a 2012 Chevrolet Sonic. The contact stated that while coming off the freeway at approximately 30-35 MPH, the vehicle began jerking. The engine revved up as if it intended to accelerate however, the vehicle would then jerk. The contact was able to coast to the destination driving approximately 5-10 mph. The check engine warning light illuminated with a trouble code regarding the engine. The contact who is a certified mechanic determined that the failure was related to Technical Service Bulletin NHTSA ID: 14V315000 (Power Train). The contact had the vehicle towed to a dealer where the vehicle was waiting to be repaired. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 87,410.”