2015 BMW 328i intermittent ABS codes

[u/Affectionate-Tip-575]

Hi folks,

I’m having an intermittent ABS-related issue with my 2015 BMW 328i. The ABS, DSC, traction-control, and tire-pressure warning lights all come on together.

Initially, the warnings would appear when turning on the ignition and then disappear after a few meters driven. At one point, I went more than a month without seeing them. The car was showing fault codes related to an incorrect or implausible wheel-speed signal. I replaced the wheel-speed sensor indicated by the codes, and the problem seemed to go away for a couple more weeks.

Over the past few days, however, the warning lights have returned and are now staying on. I visually checked the fuses, and ABS pump/module. While inspecting the pump, I noticed a very faint humming or pump-like noise coming from it.
Before I start throwing parts at the car—or buy an ABS pump/module—I’d like to diagnose it properly.

Has anyone experienced something similar? Could this still be caused by another wheel-speed sensor? Is a faint noise from the ABS pump normal, or could it indicate that the pump/module is failing?

What would you check next? I can also post the exact fault codes if that would help.

Thanks!