P3004CriticalHybrid control system - high-voltage power supply / inverter

P3004: High Voltage Power Resource Circuit Malfunction

2 vehicles · 1 makes · $2,500-$5,000 repair

Most Reported On

2023Toyota Crown 2010-2015Toyota PriusPrius +2

P3004 is an OBD-II diagnostic trouble code meaning “High Voltage Power Resource Circuit Malfunction.” Toyota's hybrid repair manuals title this code 'High Voltage Power Resource' malfunction: the hybrid/power management control ECU has detected a fault in the high-voltage supply path between the traction battery and the inverter with converter assembly. Toyota bulletin T-SB-0085-23 defines sub-code P300449 specifically as 'High Voltage Power Resource Circuit Short during Pre-Charge' - a short detected while the inverter's capacitors are being pre-charged before Ready. In practice the code most often resolves to a failed Intelligent Power Module (IPM) inside the inverter assembly, and Toyota's IPM programs (CSP 23TE03) list P3004 as a qualifying code; in freezing weather it may instead be the software condition addressed by T-SB-0085-23. This code is most commonly reported on 2023 Toyota Crown, and 2010-2015 Toyota Prius (Prius, Prius v, Prius Plug-in Hybrid), with repair costs ranging from $2,500 to $5,000.

Common Causes

1Intelligent Power Module (IPM) failure inside the inverter assembly, typically from thermal stress

2Inverter with converter assembly internal fault

3Short or insulation breakdown in the high-voltage power cable between the HV battery and inverter

4Hybrid control software condition in below-freezing temperatures (Toyota T-SB-0085-23; fixed by reflash)

5MG ECU fault within the inverter

Typical Repair Cost

$2,500 - $5,000

Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.

Diagnostic Tools

P3004 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.

Vehicles Affected (2)

Toyota P3004 page →

CrownModerate

Hybrid System Warning Lamp / MIL in Freezing Temperatures (TSB T-SB-0085-23)

2023

PriusCritical

Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall

2010-2015$2,500-$5,000

FAQ

What does P3004 mean?

P3004 stands for "High Voltage Power Resource Circuit Malfunction." Toyota's hybrid repair manuals title this code 'High Voltage Power Resource' malfunction: the hybrid/power management control ECU has detected a fault in the high-voltage supply path between the traction battery and the inverter with converter assembly. Toyota bulletin T-SB-0085-23 defines sub-code P300449 specifically as 'High Voltage Power Resource Circuit Short during Pre-Charge' - a short detected while the inverter's capacitors are being pre-charged before Ready. In practice the code most often resolves to a failed Intelligent Power Module (IPM) inside the inverter assembly, and Toyota's IPM programs (CSP 23TE03) list P3004 as a qualifying code; in freezing weather it may instead be the software condition addressed by T-SB-0085-23.

What are the most common causes of P3004?

The most common causes of P3004 are: Intelligent Power Module (IPM) failure inside the inverter assembly, typically from thermal stress, Inverter with converter assembly internal fault, Short or insulation breakdown in the high-voltage power cable between the HV battery and inverter, Hybrid control software condition in below-freezing temperatures (Toyota T-SB-0085-23; fixed by reflash), MG ECU fault within the inverter. The specific cause varies by vehicle.

How much does it cost to fix P3004?

Repair costs for P3004 range from $2,500 to $5,000, depending on the vehicle and root cause.

Which vehicles are affected by P3004?

Au7o has documented P3004 across 2 vehicle models from 1 manufacturers: Toyota.

Sources (5)

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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.