| Issue ID | 1048640 |
| Internal NHTSA # | 10573371 |
| Manufacurer | Hyundai Motor Company |
| Brand | HYUNDAI |
| Model | SONATA |
| Model Year | 2010 |
| File date | 03/02/14 |
| Component | POWER TRAIN |
| Product type code | VEHICLE |
| Description of the problem | When vehicle is cold and i decelerate down thru 20 mph, the transmission down shifts abruptly causing a jerking motion. I have been told by an auto mechanic who researched it that there was an actual recall by hyundai for this issue. He said the problem was that hyundai installed computer control equipment from an older model in their 2010 sonatas and this resulted in a failure in proper communication between the computer and the automatic transmission's solenoid, causing the abrupt down shifting at 20 mph when car is cold. One last note: when this first started occurring, it would cause the "fix engine" light to come on, but this has not happened for about the last three weeks. The abrupt down shifting when cold still occurs consistently, always right around 20 mph. |
| Vehicle Mileage at Failure | 88203 |
| Number of Occurences | 1 |
| Source of the issue | NHTSA WEB SITE |
| City and State | LAS VEGAS, NV |
| VIN pattern | 5NPET4AC2AHXXXXXX |
| Was vehicle invloved in a crash? | N |
| Was vehicle involved in a fire? | N |
| Was incedent reported to police? | N |
| Was medical attention required? | |
| Was part original equipment? | |
| No. of injured persons | 0 |
| No. of fatalities | 0 |
| Date of purchase | 07/08/26 |
| Was original owner? | N |
| Anti-lock brakes | N |
| Cruise control | N |
| Number of cylinders | 4 |
| Drive train type | |
| Transmission type | |
| Vehicle speed | 20 |
| DoT tire identifier | |
| Tire size | |
| Location of tire code | |
| Type of tire failure code | |
| Was defective tire repaired? | |
| Date of manufacture | |
| Type of child seat code | |
| Type of restraint | |
| Dealer's name | |
| Dealer's telephone number | |
| Dealer's city | |
| Dealer's state code | |
| Dealer's ZIP code |