Can i use automatic transmission fluid for power steering

If you make the substitution when that is the case, you could cause damage to the system, including deterioration of the seals and leakage. Make sure that ATF is recommended as a replacement for your power steering fluid before using it.

Automatic transmission fluid (ATF) is the same fluid used inside the automatic transmission. ATF can also be used in some power steering systems. Some ATF types include Dexron and Mercon. Synthetic power steering fluid is a non-oil-based fluid that's created in a lab.

It's better to use approved fluid for your specific car system since it's better to be safe than to be sorry. You should use transmission fluid for your power steering pump and you shouldn't use power steering fluid on your transmission pump.