B1476 AC Compressor Not Working - seeking sage advice

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Chicago David, Jul 5, 2026 at 10:40 PM.

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  1. Chicago David

    Chicago David Junior Member

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    Hola All! Our trusty 2005 Gen2 is blowing hot air w/ AC set to Max Cold - read all of the other posts, looking for a few additional opinions
    • Fuses and relays are good
    • Cleaned the pressure valve connections
    • Condenser fan spins when AC turns on, runs for a few seconds and stops
    • Originally thought the compressor wouldn’t kick on due to low 134a, low side was about 55 psi with the compressor not working which calculates out to a little low
    • Added some 134a and the low-side pressure is around 85 psi which seems right with the compressor not kicking on and the ambient temperatiure
    Both B1476 history and live DTCs are showing along w/ the B1421 (but it was very cloudy out today and I could clear the code sometimes).

    Is it time to buy an OEM compressor or is there anything else I should check or do?

    Thanks Community!
     
    #1 Chicago David, Jul 5, 2026 at 10:40 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    So what's the problem when you put the air condition on LO not a temp . And hi fan . If you get out and touch the big fat silver hose and it's coooold. You're . Making the cycle . Because it's not making it into the car is another situation . So we're we at here?
     
    #2 Tombukt2, Jul 6, 2026 at 9:49 AM
  3. ChapmanF

    ChapmanF Senior Member

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    The repair manual section for B1476 pretty much tells it like it is. The electrical power drawn by the compressor in operation is being measured too low or too high for the conditions. It can be too low if there's not enough refrigerant. It can be too high if there's too much refrigerant, or if the compressor is failing and hard to turn.

    It's up to the human to figure out which of those possibilities it is, then fix.
     
    #3 ChapmanF, Jul 6, 2026 at 12:36 PM
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