P3004 on Toyota
High Voltage Power Resource Circuit Malfunction
P3004 on Toyota vehicles indicates high voltage power resource circuit malfunction. Au7o has documented this code across 2 Toyota models — most commonly on Crown, Prius. 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. Typical repair costs on Toyota range from $2,500 to $5,000, depending on the specific model and root cause.
Common Causes of P3004
- •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
P3004 on Toyota by Model
Toyota Crown(1 issue)
- Hybrid System Warning Lamp / MIL in Freezing Temperatures (TSB T-SB-0085-23)2023
Some 2023 Crown hybrids illuminate the hybrid system warning lamp / check engine light when operated in below-freezing temperatures (below 32F / 0C). The condition is a false high-voltage power-resource circuit short detected during Ready-ON or pre-charge, logged as DTCs P1C8449 and/or P300449. The CarComplaints 2023 Crown TSB page confirms the bulletin applies to the Crown.
Toyota Prius(1 issue)
- Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall2010-2015
Transistors inside the Intelligent Power Module of the inverter/converter assembly can overheat and fail under sustained high load (long grades, hard acceleration, hot weather). When the module faults, the hybrid system shuts down and the car can stall at speed, sometimes without warning. Toyota first issued a software recall to reduce IPM thermal stress (NHTSA 14V-053, ~701,000 US Gen 3 cars), later expanded remedies (18V-684), and created Customer Support Program ZE3 extending inverter coverage on 2010-2014 Prius to 15 years/unlimited miles. Owners report stalls persisting after the software remedy, which drove follow-on litigation. This is failure of the inverter itself - distinct from the inverter coolant pump.
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View P3004 across all makes →Frequently Asked Questions
What does P3004 mean on Toyota?▼
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. On Toyota specifically, this code is documented across 2 models.
What causes P3004 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P3004 on a Toyota?▼
Repair costs on Toyota range from $2,500 to $5,000, depending on the specific model and root cause.
Which Toyota models have P3004 documented?▼
Au7o has documented P3004 on 2 Toyota models: Crown, Prius.