ABS, VSC, Brake, and tire pressure lights with NO CODES

The scanner being used can not talk (communicate) with the 14 to 16 ECUs in your Prius. So you can not read all the trouble codes that have been activated. You need a better scanner to find all the trouble codes. Read the first post and then skip down to post #37 in this thread, https://priuschat.com/index.php?posts/3246758. The Autel AP200 is a very good choice for a scanner to purchase.

The humming you hear is the brake pump. You probably have trouble code C1391, which indicates that the pump can not maintain the brake pressure because there is an internal leak in the brake actuator. This is a very common problem for a Prius.

You can also read the brake trouble codes by blinking lights on the dash. I will try to find the link for you.
Here is the link Blink (a/k/a Flash) Codes – How to. | PriusChat

 

Interesting. That's a high end Snap-On scantool and certainly is capable of scanning all systems on a Gen2. (I have a "mid range" version at work)

Not sure exactly what's going on, but I would want to sure that all systems respond during the "full" code scan.

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98,500 miles.. i thought the actuator lasts much longer..

I did replaced mine at 147,500 miles. Same year (2009). Also there were no lights, just the annoying noise every 10 seconds or so.

Where in Texas are you located? I have the Autel scanner (AP 200) and live in north Dallas area.

 

Do those Snap-On scanners have a subscription to access the advanced features? Maybe the subscription has not been renewed and has reverted to a basic scanner.

 

The ones that I use have a subscription for updates - the super duper ones also have "advanced online hand-holding diagnostics".

No subscription means that the scantool's functionality becomes static. It won't add coverage and added tests for newer cars, but it also won't lose anything either (except for the online stuff, if you have that).

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