CEL, Red Triangle with !, intermittent VSC light, and code P0093

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What's the voltage look like after the car has sat overnight?

 

If 12v is below 12. in the morning its time for a stronger 12V. H

 

I have no hint of Prius specific codes, but generically

P0093, Fuel System Leak Detected, Large Leak

Possible causes
- Faulty fuel pump
- Blocked fuel filter
- Faulty fuel pressure solenoid
- Faulty Fuel injector

basically anything that might result in low fuel pressure.

 

I do not believe that DTC P0093 is a valid Prius code. Any skid control ECU DTC would start with a "C" character (for chassis; "P" is for powertrain.)

I suggest that you discard that scan tool (or at least, do not rely upon it for Prius work) and consult with your local Toyota dealer service dept to obtain the correct DTC and a diagnosis if you don't find a problem with your 12V battery.

Regarding whether you should continue to drive the car with the braking system impaired, you should use your own judgment on that based upon any driveability symptoms you observe. At minimum I suggest that you drive at moderate speeds and leave plenty of time to stop.

 

Why not an independent repair shop that knows Prii?

 

Yes, the (!) and VSC warning lights both let you know that the skid control ECU (which controls the braking system) has logged DTC.

 

No problem with that, as long as the owner can locate a competent independent. This is not easy outside very large metropolitan areas.

 

Of course my opinion is to look for a competent independent shop first with the dealer as the second choice. If the OP were to share their location we might be able to help.

 

The OP also needs to consider whether the root cause of the problem is likely to be covered under warranty; in which case he would do best visiting his local Toyota dealer - even if a competent independent is available. Given the symptoms he has reported, if the problem is actually with the skid control ECU or other braking system components like the brake actuator, that will not be covered under the standard warranty.

 

When you press Power, the 12 volt battery runs the computers through a Power On Self Test, then, if everything is safe, it pulls on relays that allow the HV battery to power the Inverter at the 14 volts you see when running, then you get a Ready light on the dash.

If the 12 volt battery is low, you can get erroneous readings before the 14 volt Inverter output kicks in.

We get suspicious when the symptoms do not hint at one failure, in this example you have lights hinting braking issues, and codes hinting Fuel Injector issues. It seems unlikely (but not impossible) that they would fail at the same time. So we ask battery questions.

 

I think that scanner is known to trigger ABS, VSC, etc. lights.

Scan tool caused Abs, vsc,((!)), parking brake light! | PriusChat

 

Did all those lights come on at the same time or did the ABS and ((!)) come on after you scanned it for the CEL and triangle lights? Is there more to the story such as repairs being performed prior, etc.?