You'd need to tell us WHICH solenoid you're referring to. That would be helpful in getting your question answered.
On top of the starter.(usually)
Bottom of the motor, passenger side.
Under the hood, on the firewall, passenger side, very close to passenger fender.
Outside, right behind the bumper on passenger side
It's located underneath the front passenger seat.
Should be underneath on the passenger side near the back like on the pickup trucks
It is in the passenger side of the timing cover towards the bottom.
Where is the ecm located in a 2000 Chevy Malibu
passenger side of vehicle under hood right next to fender
Its on the backside of the engine (between the engine and firewall) nearest the passenger side. You can get to it from under the hood.
passenger side of the waterpump. right by where your heater hoses connect onto the pump housing.
It is located on the passenger/right rear side of the engine, near the oil filter.