The HSBA auto loan contact number for USA is: Service Center – Toll-free: 1.888.222.4227 Mon-Thur, 7 a.m. to 11 p.m. Central Time Fri, 7 a.m. to 9 p.m. Central Time Sat, 7 a.m. to 5 p.m. Central Time Sun, 7 a.m. to 9 p.m. Central Time. Good luck. If this information has been helpful, please indicate by clicking the up icon.