P3000: How to Diagnose & Fix — Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)
5 vehicles · 3 makes · $150-$7,000 repair
How to diagnose and fix P3000: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Lexus CT · 2011–2017
The CT200h NiMH hybrid battery pack loses capacity over time, reducing fuel economy and hybrid system effectiveness. The CT200h uses the same hybrid system as the Toyota Prius, and battery degradation follows a similar pattern. Hot climates accelerate degradation, and cells can develop internal resistance imbalances.
Common Symptoms
- Fuel economy drops by 5-10 MPG
- Hybrid battery warning light
- Engine runs more frequently than expected
- Reduced EV-only driving range
- Battery gauge fluctuates rapidly
How to Fix
Replace the hybrid battery pack with a new or refurbished unit. The CT200h battery is the same as the third-generation Prius, so aftermarket options are plentiful and affordable. Refurbished packs from Green Bean Battery or hybrid specialists cost $1,200-$2,000 installed.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- G9510-76014 genuine Lexus HEV supply battery assemblyOEMG9510-76014
Confirm VIN and supersession before ordering; core return applies.
- 2011-2017 Lexus CT200h complete hybrid battery replacementOEM2011-2017 CT200h hybrid battery replacement
Shipping/core-return and regional mobile-installation branches carry different terms; confirm exact option and service
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Lexus ES · 2013–2019
The ES300h hybrid battery pack experiences capacity degradation over time, particularly in hot climates where thermal cycling accelerates cell deterioration. Owners report reduced fuel economy, inability to maintain EV mode, and eventually a hybrid system warning light. The NiMH battery pack typically begins showing degradation between 8-12 years of age.
Common Symptoms
- Decreased fuel economy by 5-10 MPG
- Hybrid system warning light on dashboard
- Unable to enter or maintain EV mode
- Reduced acceleration performance
- Battery charge gauge drops rapidly
How to Fix
Replace the hybrid battery pack with a new or refurbished unit. Lexus dealers charge $3,000-$5,000 for a new pack. Aftermarket refurbished packs from companies like Green Bean Battery or Dorman cost $1,500-$2,500 installed. Individual cell replacement is also possible for partial degradation.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 2013-2017 Lexus ES300h complete hybrid battery replacementOEM2013-2017 ES300h hybrid battery replacement
Replace a diagnosed failed 2013-2017 ES300h pack through a model-specific remanufactured/new program Fitment/availability: Live configurable product page covers the pre-2019 ES300h branch and offers shipping/core-return or regional insta…
- 2013-2018 Lexus ES300h reconditioned hybrid battery installationOEM2013-2018 ES300h reconditioned pack service
Replace a diagnosed failed AVV60-generation pack through the vendor's installed service Fitment/availability: Live page title/content lists 2013-2018 ES300h and states the product is not shipped or purchased as an online DIY item; instal…
- G9510-33112 genuine Lexus HEV supply battery assemblyOEMG9510-33112
Confirm VIN and core terms.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Mitsubishi Outlander · 2022–2024
Fourth-generation Outlander and Outlander PHEV owners (2022+) report the 12V auxiliary battery repeatedly going flat, sometimes leaving the car dead in a day or two, even on nearly new vehicles and with the traction battery fully charged. Identified culprits on owner forums include the OEM infotainment/radio head unit failing to fully sleep, a driver's seat control module intermittently drawing current, a WiFi/telematics module, and a charging logic that tops up the 12V battery on a fixed daily timer rather than by voltage - so a low battery may never recover. Distinct from the high-voltage traction-battery issues.
Common Symptoms
- Dead 12V battery / no-start after sitting 1-2 days
- No dash lights, vehicle won't power on
- Repeated battery replacements not fixing the drain
- Infotainment or seat module suspected of not sleeping
- Battery drains even shortly after full charge (PHEV)
How to Fix
Diagnose parasitic draw with a multimeter (fuse-pull method) to isolate the offending circuit; check for infotainment/seat-module software updates at the dealer. Replace a degraded 12V battery (vented AGM type on PHEV) and verify DC-DC/alternator charging. Some owners fit a battery maintainer for vehicles parked for extended periods. Dealers have addressed specific VINs with module reprogramming.
What you need to diagnose it
The fix here starts with a test, not a part — which repair you need depends on what the test finds.At least one code uses a manufacturer-specific format. No scanner recommendation is shown because family-level coverage cannot prove it can read that code.
UNI-T UT210E Low-Current DC Clamp Meter
1 mA resolution on the 2 A range — a 0.1 A meter reads a 50 mA drain as zero
$40–$70View
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Testing and isolating the fault is DIY work. Replacing or reprogramming a control module is not — most are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
Sources for this issue (3)
Toyota Prius C · 2012–2019
Toyota Sienna · 2021–2025
Find P3000 by make
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P3000 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.