OBD-II trouble code
P3004: Toyota/Lexus: Power Cable Malfunction
Application matters: The archived Lexus CT200h RM1720E descriptions name P3004-131 and P3004-132 Power Cable Malfunction. Toyota’s separate February 2023 Prius/Prius V bulletin uses its own inverter-type, DTC and information-code repair branches; Lexus wiring and procedures must not be transferred to those vehicles.
In the cited Toyota/Lexus context, a high-voltage power-path or precharge fault has been reported. Keep the information code: the cable name alone does not identify a failed cable, battery or inverter.
Quick facts
- System
- Powertrain
- Category
- Hybrid Propulsion
- Severity
- High severity
- Driving guidance
- Stop safely and arrange diagnosis
- Repair cost range
- Get a vehicle-specific estimate after diagnosis.
- DIY difficulty
- Shop recommended
A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.
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What does P3004 mean?
For the Lexus CT200h descriptions cited here, P3004 is named Power Cable Malfunction. The complete information code matters. The 131 entry describes inverter voltage failing to rise during precharge; the 132 entry describes the inverter not being precharged. These are monitored electrical conditions, rather than proof that a particular cable is broken.
The Lexus tables list several possible trouble areas: the hybrid battery junction block, frame wire, inverter with converter, HV battery, and harness or connectors. The 132 table also lists the power management control ECU. A listed area is a diagnostic possibility, not a recommendation to replace it. The complete vehicle procedure must establish which part of the power path or control system failed.
A separate Toyota example is T-SB-0003-21 Rev1, revised February 16, 2023, for some 2010–2015 Prius and 2012–2017 Prius V vehicles with the listed codes. Its repair route depends on the specified physical-damage assessment. Where that damage is absent, the technician selects components using the inverter type, DTC and information code. P3004 alone therefore does not require either a whole inverter or a traction battery.
Keep owners away from high-voltage access. Do not open or disconnect cables, remove a service plug, measure inverter terminals or repeat start attempts as a test. Qualified personnel need the complete current manufacturer isolation, waiting and verification process before protected work. Follow actual stop warnings and arrange assistance if the vehicle cannot enter READY or propulsion is unreliable.
Possible causes
- A power-path or connection fault confirmed under the matching precharge diagnosis
- A junction-block, frame-wire, harness or connector concern established by the vehicle procedure
- An inverter, HV battery or control-unit fault supported by the application-specific findings
Symptoms
- P3004 and an information code recorded in a hybrid-system scan
- A malfunction indicator or hybrid warning in an applicable vehicle
- A READY or propulsion problem that requires assessment of the actual vehicle condition
Diagnostic steps
Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.
- 1.Preserve the full multi-module scan, information code, status, event data and warning messages before faults are cleared.
- 2.Have a qualified hybrid technician identify the exact vehicle definition and the monitored precharge condition.
- 3.Require findings that distinguish the relevant power path, connections and control components before authorizing a cable, battery or inverter.
- 4.For a matching Prius bulletin case, have the technician establish the specified damage branch and inverter-type/DTC/information-code selection. Do not use another model’s component map.
- 5.Complete the demonstrated repair and required verification. Follow stop warnings and recovery instructions; do not test driveability by resets or repeated starts.
Repair cost
Get a vehicle-specific estimate after diagnosis.
A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with hybrid-system fault diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
These links are planning examples; the code does not confirm that any listed part has failed.
DIY vs shop
A qualified shop is recommended because this can involve a high-voltage traction system that stays live with the car switched off and requires documented shutdown procedures, in-date insulating gloves, and specific training. Ask the technician what testing confirmed the repair.