help? DTC C1256 Code

welcome!
sounds like you need a new brake actuator

 

Welcome to PriusChat!!

Here is the workup for DTC C1256 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Repair%20Manual/04pruisr/05/21avn/cic12565.pdf

 

they are around $2,500. at a dealer. some people have been able to find a local mech who will install a salvage unit for around $500. iirc.

 

are there any symptoms?

 

While you're admiring all the digits after that dollar sign, do think on following that workup procedure from SFO before you decide for sure that part is what you need.

 

Well, if you hadn't already posted the trouble code, that would be the first order of business, but you've already done that. SFO then posted the workup instructions for that code, which tell somebody how to find out whether the code was set because of an actuator problem or an ECU problem. That could help with deciding what to try to buy.

Both parts are probably available on the salvage market for considerably less than new ones.

 

Have you been talked into figuring out what's broken before buying a replacement yet?

 

I replaced my brake actuator with one I pulled from the scrap yard for $75. It's a fairly involved process. And then the brakes need to be bled with the techstream software afterwards. Totally doable diy project, but it is somewhat challenging if I remember correctly.

Make sure to walk through the steps to diagnose the problem before taking any action. I bought my car with the issue and it had the red triangle on the dash with a slew of other lights as well and wasn't happy that I was driving it. So yours may progress in that direction if that is in fact the issue.

Posted via the PriusChat mobile app.

 

If you paid the dealership for a diagnostic, that would include them attaching an OBD2 scanner to scan the vehicle for any stored codes (DTCs) in the ECUs, could you please post all of the retrieved codes in this thread.

 

Ok, so they're too busy with work they'd rather do than follow their own diagnostic steps in their own manual.

Fortunately SFO posted those steps earlier.

If you had a laptop with Techstream it could do the step 2 of testing (read the accumulator pressure sensor). The rest you can do with a multimeter.

The name of the game (as you can see from the outcomes of those steps) is "decide whether to replace the actuator or the ECU".