P0A80

P0A80 is the BECM's explicit verdict that the hybrid battery pack has exceeded its end-of-life criteria and must be replaced — it is set after persistent P0A7F deterioration conditions, block voltage delta exceeding 1.2V on Toyota HSD, or repeated state-of-charge calculation failures across multiple drive cycles. Cheapest-first diagnostic ladder: confirm the code is not stale from a prior pack swap or BECM reset by clearing and driving two full warm-up cycles with mixed city/highway — a freshly rebuilt pack should not re-set P0A80 within 50 miles unless a module is already failing. Pull block voltages with Techstream/FORScan/HDS and document the spread; a pack throwing P0A80 will typically show 0.5V or greater delta between strongest and weakest block at rest, and 1.0V or greater under load. Caveat: P0A80 is a hard-set code on most platforms and will not self-clear even after module replacement until the BECM completes its internal recalibration cycle.

Vehicle-specific patterns: 2004-2009 Toyota Prius Gen 2 (NHW20) — the iconic P0A80 case, typically at 180K-220K miles; options are OEM new ($2400+), Toyota reman ($1800), independent refurb with grid-charged modules ($1100), or full lithium conversion ($2200-3000). 2010-2015 Toyota Prius Gen 3 — same code but pack uses 28 modules in 14 blocks with revised cooling. 2007-2011 Toyota Camry Hybrid — 34-module NiMH pack under rear seat, P0A80 onset around 160K with the trunk-mounted blower drawing dust. 2005-2012 Ford Escape Hybrid — 250V NiMH pack, P0A80 typically forces dealer-only replacement due to BECM marriage. Estimated repair: $1,100 to $4,800.