All the dash warning lights are on (ABS, VSA, Power Steering) as well as messages displayed on the information screen.
hydraulic pump runs continuously, even with the car turned off.
Brake reservoir has proper fluid level, battery was tested fine (disconnected to prevent pump from draining battery)
Car is well maintained and under 50k miles.
I rapped the pump body with a hammer a few times, and the buzzing/whirring changed tone slightly. I'm suspecting the pump pistons are jammed in the rotor and the pump is not effective.
ABS does not function, but steering and all other systems run and drive normally.
Replacing the ABS pump/modulator is easy, but selling my firstborn for the part will not be.
ABS pump is running continuously, even with the vehicle completely turned off. My Solus and code reader(s) don't cover 2012 Honda for ABS. The controller seems to be part of the pump/modulator assembly. I suppose it's possible it's bad, but the internet searches seem to all point to replacing the pump.
The fact that I rapped it with a hammer and the tone changed (from a whine to a pulsing chug) leads me to believe the pump pistons no longer float well (probably from water/corrosion) and the pump is not effective in building accumulator pressure.
I found a 27k used one complete on eBay for $110, which is half of what I can buy just the controller for. The pump section can be taken apart (not officially) but I'm waiting for the spare installed and working before I break that seal.
Car is functional without ABS but would be stranded with the modulator removed and all the brake lines open. The Vehicle Stability Assist, ABS, and in some way the electric power steering are all somehow tied to this pump/modulator module.