This bulletin describes the service procedure to inspect the lot number of the electronic stability control (ESC) module of certain Santa Fe (NC) and Tucson (TL) vehicles. Parts from the affected LOT number may have damaged bolts which hold the ECU to the solenoid block. Vehicles with affected LOT number ESC modules must be inspected for damaged bolts. If the bolts are intact, they must be replaced. If the bolts are damaged, the HECU assembly must be replaced.