Sony alpha a6000 camera error

Assuming it happens with a known good lens (or no lens at all):

The shutter is about the only essential moving part in an a6000 - there is no mirror, no aperture actuator, no AF motor, no IBIS (there is a sensor cleaning mechanism with an ultrasonic actuator, though). It would be a likely candidate.

Sony FAQs say that this message indicates either a shutter, lens or IBIS problem. A6000 has no IBIS. A lens problem can easily be isolated by not attaching a lens.

Other things that could have taken damage and indirectly cause such a malfunction:

• A switch or dial could have gotten knocked into making contact in a pattern that is impossible when intact

• External contacts could have gotten bent and shorted together (hotshoe, card socket, or lens mount)

• Some metal enclosure part could have got bent enough to short something electrical out

• Some flex cable got knocked out of its socket

• Some heavy electronic component (eg an inductor or electrolytic capacitor) got sheared or broken off a PCB (unlikely that an a6000 enclosure would survive that kind of impact intact).