The battery module electrical connectors differ on the Bolt EV from those on other Hybrid and Battery Electric vehicles. GM-48571-63 is a pinout box adapter cable used with the previously essential pinout box GM-48571-A. The adapter and pinout box together allow Bolt EV individual cell groups to be checked with a multimeter at the CMA1, 2, 3, 5, 6, 8, 9, 10 X1 and CMA1, 2, 3, 5, 6, 8, 9, 10 X2 connectors for comparison with the GDS2 Scan Tool data and corresponding DTCs for proper diagnostics. The low-output cell group, or groups, can then be identified and appropriate repairs performed, which may avoid the need for replacement of the entire pack.