{"count":1,"message":"Results returned successfully","results":[{"odiNumber":11711937,"manufacturer":"General Motors, LLC","crash":false,"fire":false,"numberOfInjuries":0,"numberOfDeaths":0,"dateOfIncident":"08/09/2025","dateComplaintFiled":"01/19/2026","vin":"3GTUUDEL2SG","components":"ENGINE","summary":"I have the 6.2 L87 with the 10 speed transmission in my 2025 Sierra. At cold start, when auto stop restarts the truck,  when the truck downshifts under 20 mph down to 12 mph the engine or transmission makes a chirping/squeak/squeal sounds. Several repair attempts have been made, parts replaced. According to GM and their \u201cfield engineer\u201d this is a \u201cnormal characteristic of the dfm system\u201d. They claim that it has to do with ignition timing. Not my first dfm truck, but it is the first to make this noise. There is  not very many components in \u201cthe dfm system\u201d that can make a metal on metal squeak/chirp/squeal sound other than lifters/pushrods, but the noise could be coming from the transmission/bell housing area.  I am fairly certain this is an early warning sign of engine or transmission failure.  Truck currently has 7,800 miles. If this was an actual \u201cnormal behavior\u201d for this engine, all of them would make the same noise.  But out of 7 other trucks with the same engine and transmission that i have started/drove, none of them made the noise. It has made this noise since i purchased it brand new. A Gm field engineer \u201clooked\u201d at the truck 3 weeks ago, and I still have not received any paperwork on what they actually did when diagnosing it. Not a single document from the dealership or GM, regarding the 4 days that my truck was at the dealership on the 4th repair attempt.  Gm technical service bulletin I was referred to by the dealership is 22-NA-218 Will update this complaint when failure occurs.","products":[{"type":"Vehicle","productYear":"2025","productMake":"GMC","productModel":"SIERRA 1500","manufacturer":"General Motors, LLC"}]}]}