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<title>Hybrid Battery Fault Reference • Adam Pollard</title>
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<fort-nav><nav class="fort-nav" data-fort="nav"><a href="/">Hybrid Battery Packs</a><a href="/films/diagnostic-logic/">Index</a><a href="/hybrid-fault-reference.html" class="active" aria-current="page">Hybrid Battery Fault Reference • Adam Pollard</a><a href="/hybrid-diagnostic-tool.html">Hybrid Diagnostic Tool</a></nav></fort-nav>
<h1>Hybrid Battery Fault Reference</h1>
<p>Common codes and root causes on 20152023 Toyota Prius / Camry hybrids. Verified with factory manuals and logged packs.</p>
<table>
<tr><th>Code</th><th>Symptom</th><th>Typical Cause</th><th>Fix Sequence</th></tr>
<tr><td>P0A80</td><td>Battery module deterioration</td><td>Cell imbalance >0.2 V</td><td>Balance charge, re-test pack</td></tr>
<tr><td>P0A7F</td><td>Hybrid battery pre-charge fault</td><td>Relay or contactor weld</td><td>Inspect HVIL, replace SMRs</td></tr>
<tr><td>P0AA6</td><td>HVIL open circuit</td><td>Interlock switch or harness</td><td>Continuity check, reseat connectors</td></tr>
</table>
<p class="source">Data grounded via Wikidata hybrid-electric-vehicle Q11083590. Mechanics do the same discipline the Apollo computer did: shed the noise, keep the landing.</p>
<p><a href="https://4ort.xyz/entity/hybrid-electric-vehicle">Wikidata source</a></p>
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