Basically because the pump has gone bad.
this code is a pressure leak in the fuel system -- check gas cap and eval system.
How do I get my Radiator out of my 06 impala
Behind the water pump pulley. The water pump is small so the water pump pulley covers the entire pump so you can't see it. Once you remove the serpentine belt and the water pump pulley, the pump is easily accessible.
No! No!
06 impala ss, stock to stock.
the magnum R/T.
yes
6x9" on the rear deck.
No.
under passenger sear
You will have to remove the timing belt to replace the water pump. I just had mine done on 06 kia sorento and it took the mechanic 6 hours.
Your cooling system should be pressure tested to find the source of the leak. There were many 02-06 4 cylinder Camrys with faulty waterpumps. If it was replaced at the dealer less than 1 year ago, it may be under Toyota parts/service warranty. If not, you may very well need to buy another water pump if that is in fact the source of the leak.