P0A93 error code

I was driving one day when the engine check light came on after I could get any power from the car to go up a hill ( this never happens) and sometimes the car would rev out when I pressing the gas and feels like it is struggling to move. Took the car to the mechanic, he scanned the car and the P0A93 error code came up saying that something is wrong coolant with coolant pump A something of that sort. I then replaced the inverter coolant pump. The mechanic scanned the car again and no error codes were seen. Few minutes after I drove off after replacing the pump the engine check light on. Went to the mechanic, he scanned the car again and it was the same P0A93 code. What else should I do?

 

He also checked if the pump was working and heard a sound coming from it and also saw it pumping the coolant. So it seems as if the pump is working. What else could be cause of the error code