{"count":1,"message":"Results returned successfully","results":[{"odiNumber":11766397,"manufacturer":"Hyundai Motor America","crash":false,"fire":false,"numberOfInjuries":0,"numberOfDeaths":0,"dateOfIncident":"03/26/2026","dateComplaintFiled":"09/23/2026","vin":"5NMS23AD5KH","components":"POWER TRAIN,ENGINE","summary":"On 03/26/2026, my 2019 Hyundai Santa Fe received Hyundai Service Campaign 9C2 (TSB 26-01-013H-1), which included an Engine Control Module (ECM) software update for Theta II emissions improvement. The vehicle did not have the following drivability problem before this software update.  Immediately after the 9C2 update, the vehicle began jerking/bucking slightly at low speeds, most noticeably around 10-20 mph when coasting with no accelerator input or when applying very light throttle. Acceleration response also feels slower than before the update, with noticeable hesitation when the accelerator is pressed.  The problem is most noticeable during the beginning of a drive when the vehicle is cold. After driving for some time and the vehicle warms up, the symptoms improve, although the change in drivability remains noticeable compared with operation before the update.  There have been no warning lights or warning messages associated with the problem. The issue began immediately following the ECM software update. The vehicle has not yet been returned to the dealer for diagnosis or confirmation and is available for inspection.  I am concerned about the safety implications of delayed or unpredictable acceleration response, particularly when entering traffic, crossing an intersection, or merging when timely acceleration may be necessary. I am reporting this because the condition began only after Hyundai Service Campaign 9C2 was performed and I believe NHTSA should evaluate whether this ECM software update is causing similar drivability and acceleration problems in affected vehicles.","products":[{"type":"Vehicle","productYear":"2019","productMake":"HYUNDAI","productModel":"SANTA FE","manufacturer":"Hyundai Motor America"}]}]}