Fault code 4012 causing Three Amigos

I had been free of the Three Amigos for a little while but they have re-appeared and the code is:

Fault 4012 Pump Failure 1 (High level at X2 Pin 8 without pump actuation)

Any thoughts on a cause and how to fix?

Background: I previously had fault code 4022 Earth not connected to ground.
The ground wire to my ABS module was broken. I repaired the wire and cleared the code.

I did check the ground behind the left headlight and found it was bad. I repaired it and the 4022 fault went away with no codes for a short time. Now I am getting this 4012 fault and really cannot find any information on the cause and how to fix it.