One problem related to power steering fluid has been reported for the 2005 Toyota Scion Tc. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Scion Tc based on all problems reported for the 2005 Scion Tc.
I took my 2005 Scion Tc to dealer to have a routine warranty oil change. Tech told me that power steering fluid was completely black. When pressed for an explanation, I was told this was normal wear (even at only 25,000 mi). I had the fluid replaced for a hefty fee, but called to speak w/ a service manager and was again told that this is a normal wear issue "for all Toyota's" and was assured that nothing was wrong with the steering system. I have never heard of this being "normal" as this is a contained system. Another friend mechanic said it sounds as though something within the system is corroding or wearing (possibly metal chips or wearing of black rubber hoses). I am in the process of writing a letter to Toyota/scion headquarters, as I haven't been able to find a reasonable explanation or a service bulletin and my warranty will be up in another 5000 miles. I don't want to find out something is wrong in a couple years, but be out of warranty by then. If you've had this same problem, please make a formal complaint!.