Steady electronic beep, dash flickering, codes C1241, C1353, and C2318, 2009 Prius

Welcome to PriusChat!!

Unlikely if the 12v is bad, though it could be low, and you can check the resting voltage with a multi-meter or voltmeter to be sure.

You can also take it to a local auto parts chain store and they can test it for you.

It sounds like the diagnostic tool may not be hybrid compatible, best to borrow another, even within the same auto parts chain.

When was the last time the inverter coolant pump was replaced? (check you maintenance paperwork for DTC P0A93)

With the vehicle on, check for turbulence by removing the inverter reservoir cap and look inside, or use a pencil/stick/rod to feel the pump.

Here is the work up for C1241 : 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/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21avn/cic12414.pdf

Tip: In the above PDF, the different 'detailed code'(s) for DTC C1241 are subcodes (81, 82, 83, 84), also known as INF(s). Make sure your OBD2 reader/scannner has the ability to provide an associated INF (if it exists) for a primary DTC. Having both DTCs and any subcodes (INFs) make tracking down a problem that much easier.

Here is the workup for DTC 1353 : 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/cic13153.pdf

Here is the workup for C2318 : 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/05/21age/cic2318.pdf

FYI : you're moderated until you've posted 5 times.

 

As SFO mentioned, the initial guess is that something is wrong with your inverter cooling system, causing the inverter to run hot. This will set codes and result in sections of the inverter turning off to prevent damage. A/C compressor and the DC-DC converter (provides 12V power to the car) are first to shut down.

Having the inverter coolant pump fail is very common on the Gen2 Prius. Sometimes it just stops working. Sometimes it shorts, which blows the AM2 fuse and "kills" the car completely until the fault is repaired. It is recommended to only use a Toyota pump from a reputable source, as aftermarket pumps have questionable reliability.

There are a number of options for scantools if you want to be able to gets codes and data yourself. Techstream (dealer diagnostic software and OBD cable for pc), or a number of apps and OBD devices for smartphone are out there. Use the search function to learn more.

IF your fault is inverter overheat (P0A93) but your pump works, then it is possible to have problems with other bits in the cooling system, such as debris or bent fins plugging up the air passages through the bottom section of the radiator.

Posted via the PriusChat mobile app.