Yes
Pilot light alone will not produce enough heat to damage the tank, but the main burner will destroy the tank and possibly start a fire. Why would anyone want to leave the pilot light on an empty tank?
Spillage , bad thermocouple
It's possible hard water deposits have built up inside. To prevent this and the early demise of your water heater, drain and flush the heater at least once a year.
remove the fuel tank and drain the water
The pilot setting will heat the water a few degrees. A gas water heater will have a thermal rating in BTU of 30,000 to 80,000. The pilot light by itself will have about 1,000 BTU. Operating overnight with no water movement and a well-insulated tank, you will observe a temperature rise but certainly not enough for clothes washing, dishwashers, or showers.
The check engine light on the Honda Pilot is an indicator that there may be a problem with the engine. This could be minor such as air or water in the gas tank or could be an indicator of something more serious.
Sound like maybe the bladder has burst in the tank and is covering the drain.
it should not be a water in oil tank it is mean engine cracked
It is the thin copper line coming out of the bottom of the control valve and running to the pilot light. Should follow the tube coming out of the bottom of the control valve that supplies gas to the pilot light.
Shut the water supply to it and drain it.
Bottom of the air tank. Used to drain the water in the bottom off the tank
The only way to know for sure if a person has water in the gas tank is to drain the tank. Usually a car will sputter and die if there is water in the tank.