P3000: Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)
5 vehicles · 3 makes · $150-$7,000 repair
Most Reported On
P3000 is an OBD-II diagnostic trouble code meaning “Hybrid/High-Voltage Battery Control System Malfunction (Parent Code).” P3000 is a high-voltage battery malfunction code used mainly on hybrid vehicles (commonly Toyota and Lexus), set when the hybrid/battery control system detects an abnormality in the HV battery pack or its monitoring system. It is intentionally a generic 'parent' code — the specific fault (weak cell block, cooling problem, communication loss, contactor issue) is identified by accompanying sub-codes (INF codes). It can cause warning lights, reduced hybrid assist, or the vehicle refusing to enter Ready mode. Because it involves the high-voltage system, it is important and usually needs hybrid-capable diagnostic equipment. This code is most commonly reported on 2011-2017 Lexus CT (CT200h), 2013-2019 Lexus ES (ES300h), and 2022-2024 Mitsubishi Outlander (ES, SE, SEL, LE, Platinum Edition, PHEV), plus 2 other vehicles, with repair costs ranging from $150 to $7,000.
Common Causes
Typical Repair Cost
Based on 5 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P3000 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 (5)
FAQ
What does P3000 mean?
P3000 stands for "Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)." P3000 is a high-voltage battery malfunction code used mainly on hybrid vehicles (commonly Toyota and Lexus), set when the hybrid/battery control system detects an abnormality in the HV battery pack or its monitoring system. It is intentionally a generic 'parent' code — the specific fault (weak cell block, cooling problem, communication loss, contactor issue) is identified by accompanying sub-codes (INF codes). It can cause warning lights, reduced hybrid assist, or the vehicle refusing to enter Ready mode. Because it involves the high-voltage system, it is important and usually needs hybrid-capable diagnostic equipment.
What are the most common causes of P3000?
The most common causes of P3000 are: Weak or degraded HV battery cell block/module, Battery cooling fan failure or blocked cooling airflow, Loss of CAN communication between battery ECU and hybrid ECU, Battery ECU / battery management system fault, Stuck contactor or insulation (leak/short) fault, Corroded or loose HV battery connections/bus bars, Aging high-mileage hybrid battery pack. The specific cause varies by vehicle.
How much does it cost to fix P3000?
Repair costs for P3000 range from $150 to $7,000, depending on the vehicle and root cause.
Which vehicles are affected by P3000?
Au7o has documented P3000 across 5 vehicle models from 3 manufacturers: Lexus, Mitsubishi, Toyota.
Sources (5)
- Forum12v battery death - Mitsubishi Outlander PHEV Forum
- ForumDead Auxiliary Battery (twice in 2 days) - Outlander Forums
- Forum12v Auxiliary Battery rapid discharge - Mitsubishi Outlander PHEV Forum
- ForumReddit r/Toyota thread discussing hybrid battery degradation in 2021 Sienna
- ForumReddit r/Prius thread discussing hybrid battery degradation on Prius C
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.