Red Triangle, 5 codes (?), Prius will start but won't drive.

P0420 Code Solved | PriusChat

that’s a lot of codes to hit all at once. I would start with a free load test at an auto parts store

 

Those are all codes from the engine controls: not worthless, but not the reason the red triangle is on. To find the rest of the codes you will need a scan tool that can query all the controllers in a Prius.

 

The Red Triangle (Master Warning Light) usually indicates a problem with the hybrid system. I think the five trouble codes that you listed do not trigger the Read Triangle warning light. So, I think the scan tool that you are using is not capable of communicating with all the ECUs in the car and reading all the trouble codes that have been activated. You need a better scan tool. Read the first post, then scroll down to post #37 in this thread,
https://priuschat.com/index.php?posts/3246758
The Autel AP200 is a good choice. It is on sale right now on Amazon.

You need all the trouble codes before you start diagnosing the problem with your car.

Edit: ChapmanF posted 4 minutes before my post, confirming what I have posted about the Red Triangle.

 

I'm also having very good luck with an ELM327 Bluetooth OBD2 adapter and car something It's a free download It seems to work very well it I don't think it will bleed the brakes but boy it's a good code reader for pretty much free and then if you were to use the car rista app with the elm 327 I think it will bleed the brakes but it's a subscription deal

 

Yes, as mentioned it would be very useful to have a scantool that is capable of checking ALL systems for codes.

That said, if we do a bit of assumptionating (ie, it's a guess), the P2111 code could explain your symptoms. It means that the ECM (engine computer) thinks that the throttle plate is stuck open. If that happens, the ECM will shut down the engine (and that makes all the other system ecu's sad).

Look up youtube videos for cleaning the throttle body on a Gen2 Prius (2004 to 2009). You want to clean the throttle blade, and the walls of the bore where the blade sits when closed. Also see if the blade moves smoothly from fully closed to fully open.

Might be an internal problem in the throttle housing, but clean it first and see what happens.

P2111 "pd" means that the ECM also set the same code as "pending". That means the fault happened the last time the engine ran. Normally a pending code by itself won't turn on the Check Engine Light unless it happens again (so at least 2 failures in a row).

The other three codes deal with "emissions systems" and shouldn't directly affect how the car drives. P0420 is for low catalytic converter efficiency. P1116 and P1121 are for the Coolant Heat Storage system (thermos tank that holds some coolant to speed up engine warmup after cold start).

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The Dr Prius app is not capable of reading all the trouble codes in your Prius. That is why I recommended the Autel AP200, which is capable of reading all the codes. Report back on what Dr Prius reports for the trouble codes.

 

The OP says the car will start with the P2111 code, which seems very strange to me. You would think that the car would not be able to start with that code.

 

It depends on how Toyota implemented their failsafe strategy for this problem. Maybe it's allowing engine startup then if the ECM can't control the throttle it disallows drive functions then kills the ICE.

Every manufacturer has their own way of doing "the same thing". Some cars have levels of functionality for different throttle faults. Could be RPM or MPH limited, then fixed high idle, idle only, with no start (or no crank) if things are bad enough.

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