Prius 2009 slip indicator light when going about 60mph

It doesn't really matter as long as they are all the size. It is preferable for them to be the same make and type, too.

If your tyres are the same size and type, then you need to read the codes and look at the freeze frame data to work out why the slip light is lighting.

 

Came here with the same issue, except it came on totally out of the blue. My tires are all the same and in great shape, and I had them rotated but it didn't help. How do you read the code with something like this that only flashes for a few seconds? Should an auto shop be able to read it like they would a check engine code? Thanks!

 

If it only flashes randomly every now and then, there might be nothing wrong. That's what happens when VSC is doing its job.

But, if there is really a problem, then yes a capable scanner that can read the brake system/HV Control system ECUs is what's required. Something like Techstream.

 

Did you ever figure out what happened? We can’t go over 60 mph and the slip lights come on.

 

I did ultimately bring it in, and apparently they'd need to replace my entire hydraulics system to the tune of $2k to fix it. So, that's not happening unless it starts to feel like a safety concern.

 

You might have some kind of problem with the ABS wheel speed sensors that makes the ABS/VSC ecu think that the drive wheels are spinning faster than the rears. Or you could have mismatched tires (different circumferences) that cause the same thing.

Having a scantool that is capable of looking at data from the ABS system (such as Techstream) would help immensely.

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That sounds like the stuff dealers say when they have other customers with appointments for easier jobs and they don't feel like the effort to find out what's happening with your car.

If they read trouble codes and didn't give those to you, you should insist that they do; then post them here.

Besides just reading trouble codes, Techstream has a utility called ABS History that can give you the details of what was happening the most recent four times the ABS or traction control (same computer handles both) kicked in.

 

So as you know I’ve been having abs svc ! Lights come on after replacing wheel bearings (abs 32/36 vsc 43, ! 34) Before I did that I had a horrible sound and the same traction control light at 60. Well I ordered new sensor on the chance they could’ve been damaged. So I reset lights and all seemed good til my morning commute , the same abs svc ! Came on and the ride felt rougher (like I got some crap bearings). I didn’t get to pull the codes this time. After work the lights are off but I didn’t reset them and now the traction light is coming on after 69 again. My ride is definitely not as smooth as the first week of new wheel bearings, it feels like they’re altlready failing again or something. Vsc and ! Is back on (kicked on after 79-80 no more traction control light. The lights just went off again and only kicked on at 83 mph.
i don’t know how long it’ll take me to dig up techstream, but my current OBD can do freeze-frame data. What would I be looking for and how do I take freeze frame data? Does it take the data itself when it detects something weird?

I should get an alignment after replacing wheel bearings shouldnt I?