P0504
Brake signal vs brake pressure correlation check failed.
Driver may be activating the BLS for more than 2.5 sec without building more than 10 psi of hydraulic pressure in the brake system. Riding the brake pedal.
BLS may be always activated.
Fuse F5 may be blown.

P061E
Low brake pressure activated before brake light switch. Not plausible.
Fuse F5 may be blown.

P1614
Throttle body may need to cleaned.
Throttle body position sensor may need to reset. Hook up to Buds required.
Throttle body may need to be replaced.