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P3000 on a Toyota or Lexus: read the sub-code first
Toyota's own service bulletin says not to diagnose P3000/123 at all — it is a companion code. The sub-code stored with it is the one that names the fault.
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Symptoms, decisions and the things that cost people money. Written for Toyota, Prius and Lexus owners in the Phoenix metro — not for search engines.
Toyota's own service bulletin says not to diagnose P3000/123 at all — it is a companion code. The sub-code stored with it is the one that names the fault.
It's a system-level message covering the battery, inverter, cooling, motors and 12V supply — not a diagnosis, and not automatically a battery.
· Updated August 18, 2026
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