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Toyota · Prius · 2004–2009
100k–250k mi (peaks ~170k)
$1,400–$3,800
Population range — not a quote for your car.
High-voltage battery
EV and hybrid traction packs. Different math, different lifespan curve, different replacement reality than anything in the gas world.
Major patterns are wallet events — repairs in the four-figure range that re-shape the math on a quote or a purchase decision.
Vehicles outside this population may exhibit the same symptoms for unrelated reasons. The engine resolves down to your specific VIN before applying this pattern to a Verdict.
The window above is where most documented failures cluster. Vehicles past the tail aren’t immune — but they’ve statistically aged out of the high-density band.
A symptom matching this list isn’t a diagnosis — it’s a flag. The Verdict engine cross-checks symptoms against your VIN’s recall history and the failure window to weigh the probability.
If any of these have been performed on the affected vehicle, the engine reduces the failure-mode deduction accordingly. Documentation matters — “the previous owner said” isn’t the same as a receipt.
Documented hybrid battery replacement (any source) within last 50k miles
root cause fix
Reconditioned battery replacement
root cause fix
Hybrid battery cooling system service / fan cleaning
mitigating service
$1,400–$3,800
This is the documented dollar range we see across affected vehicles. Quotes outside this band — high or low — get flagged in a Verdict.
Base deduction−8 on the 0–100 scale.
Past-window credit60% credit back if the vehicle has aged past the window without symptoms.
Each entry traces to documented sources — recall bulletins, regulator complaints, manufacturer service bulletins. Not forum chatter.
The encyclopedia tells you what’s documented across the population. The Verdict tells you what it means for your specific year, mileage, and recall status.