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The computer is protecting the engine by not allowing it to start or run while in an overheated condition. Once the engine cools down to a safe operating temperature the computer will allow it to be re-started.
You may have overheated the engine or seized it.
Could have just overheated
If you do this incorrectly you will have engine damage when you attempt to start the engine. Take it to a professional and have it done right.
In modern vehicles, there are sensors which will prevent the engine from coming on when it is overheated. This is a protection measure.
Perhaps starter is getting weak and needs replacing--takes more effort to start hot engine
If the car overheated, you may have warped the aluminum head. You may have to have the head shaved and a new head gasket put in.
check starter motor
Start with a compression test. Head gaskets fail when an engine overheats and that's a common cause of sudden engine failure. It doesn't always mean that the engine has to have overheated RECENTLY; sometimes it has to be run for a while.
does it stall/ have lack of power. has it ever overheated? cylinter walls may be warped.
Not necessarily. I actually just overheated my air-cooled engine the other day. First, are you sure it is water-cooled? If so then more than likely you will need to replace certain parts in the engine such as piston, piston ring, etc. Or it would be cheaper to just buy a new engine.
Your engine overheated for whatever reason.