2015 Tahoe JB1 vs JD9 Brake Codes

[Jason101]

Does anyone know the difference between the following codes:

JB1 - BRAKES, 4-WHEELDISCANTILOCK VAC POWER

JD9 - ANTILOCK BRAKES, 4 WHEEL DISC

Two 2015 Tahoes I am looking at both have the Max Trailering Package (NHT), but both have different brake codes. I searched the forum, and see other posts referencing JD9, but had no hits when I searched JB1

 

[swathdiver]

JB1 should be accompanied by Y66, both are for use with adaptive cruise control.

JD9 is regular stabilitrak VSES brakes.