"Good reliability" means that something consistently performs well and can be trusted to work correctly without failing or causing problems. Full definition
The 2015 facelift improved the quality of the materials used throughout the car's interior and the car has a reputation for good reliability. (carbuyer.co.uk)
Overall, all of the scales showed good reliability. (ncrpp.org)
It has good reliability ratings and good safety ratings, so it's a solid choice in those areas, too. (edmunds.com)