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🟢 SOLVED: Toyota Prius inverter coolant pump failure — Toyota Prius 2004 | MyCarFault
🟢 SOLVED 80% 1 fix reported · 112 driver confirmations

🟢 Toyota Prius inverter coolant pump failure

Toyota Prius 2004
On This Page: 🔍 Symptoms ⚙️ Causes 🔧 All Repairs ⚠️ Avoid These 🧾 Driver Reports 🔗 Similar Faults
⚡ Quick Summary
Severity Level
Critical
Safe to Drive?
🚫 Do NOT Drive
Safety Impact
Direct safety risk — affects safe operation of the vehicle
Urgency Level
🔴 Fix Immediately

Prius warning lights, reduced power, hybrid system fault. Inverter overheating. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.

🔍 Symptoms

📍 Toyota Prius 2nd/3rd gen

⚙️ Possible Causes

Toyota Prius 2nd/3rd gen Possible: Prius inverter cooling pump: the electric pump that cools the inverter fails silently and causes inverter overheating damage if not caught. Symptoms: triangle warning + hybrid system fault. The pump runs on a separate cooling loop from the engine — check

Repair / Solution

Based on 112 driver confirmations

Prius inverter cooling pump: the electric pump that cools the inverter fails silently and causes inverter overheating damage if not caught. Symptoms: triangle warning + hybrid system fault. The pump runs on a separate cooling loop from the engine — check 0%
0 worked · 0 did not · ⚪ Unverified

⚠️ Wrong Diagnosis?

No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Toyota Prius 2004 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

🧾 Driver Reports

✅ Fixed Prius inverter cooling pump: the electric pump that cools the inverter fails silently and causes inverter overheating damage if not caught. Symptoms: triangle warning + hybrid system fault. The pump runs on a separate cooling loop from the engine — check

Prius inverter cooling pump: the electric pump that cools the inverter fails silently and causes inverter overheating damage if not caught. Symptoms: triangle warning + hybrid system fault. The pump runs on a separate cooling loop from the engine — check this reservoir too. Pump failure signs: pump not running when ignition on, pump vibrating excessively. Replace pump proactively on 2004-2009 Prius at 150k miles — $60-100 for pump, 1 hour DIY. Inverter damage from overheating costs $3000-5000. Cheap prevention.

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