Prius Code help

The fact that you can hear the HV battery fan is a BAD sign. This could be due to module(s) is/are failing and overheating, OR, the fan HV fan is clogged.

You could check and clean the fan. If clogged, this might be the cure.

P0301= cyl 1misfire. The spark plugs should be replaced no later than 150K miles. Have they ever been replaced? If they have been w/ the correct irridium sp, the. maybe the coil is bad?

Is the code reader using Techstream software? Or is this a generic universal code reader, that will miss many specific Prius codes.

 

probably a long shot since the engine skipped, but was the 12v at least 12.4 volts after being off for a few hours?

 

you reset the computers, but the codes will likely return at some point

 

NO.

The Fan going on HIGH speed, is a reaction to the temperature sensors detecting excessive heat coming from the modules in the HV Battery.

You have a HV pack that is already terminal. STOP DRIVING THE CAR, unless you don't mind being stranded at an inopportune location and time. GUARANTEED, this will happen if you continue to clear the codes to make the car drivable for a short period of time/distance. Also, many other module pairs are bad. Many have a voltage difference greater than 0.2V.

The most reliable repair is a new OEM replacement HV Pack. $1699.70, at Conicelli Toyota. You will need to see if Toyota dealers near you will sell you a pack OTC (Over The Conter). You will need to call local dealers to see if they will price match, as some might do it. The part is relatively pricey. If you amortize the cost over its likey lifespan of 10years, it is affordable. $1699.70/10years = $169.97/year = $14.16/month = $0.47/day The pack can be placed into another Gen2 with relative ease. It can also go into a Gen3 by swapping the modules into a Gen3 case. This might also be possible w/ certain Gen4s.

Replacing bad modules w/ healthier ones is an unreliable, SHORT TERM solution. The Gen2 modules are (2004-2009) 9-14 years old, and getting older. Mixing modules from a Gen3 is a bad idea b/c of likely large resistance differences between the old and younger module. A used/refurbished/remanufactured/reconditioned HV pack suffers the same unreliable problem. People who have swapped modules or purchased a used pack, have reported failures w/in a short time.

The question becomes what do you want to do (new or used), what do you value (reliability or unreliability), and what can you afford. Remember, time is the most important resource, b/c you can never earn more time. Money is limited, but you can earn more (pay raise, spend less, save more, sell stuff, 2nd job, etc).