P3000: How to Diagnose & Fix — Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)
4 vehicles · 2 makes · $800-$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 uses the same modules and housing as the third-generation Prius pack, 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.
Sources for this issue (3)
Lexus ES · 2013–2018
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.
Sources for this issue (3)
Toyota Prius C · 2012–2019
The Prius C's nickel-metal hydride (NiMH) hybrid battery pack degrades over time, with noticeable range and fuel economy loss typically appearing between 100,000-150,000 miles. Individual cells develop imbalances, causing the hybrid system to operate less efficiently. The Prius C's smaller battery pack (compared to the standard Prius) is worked harder and may degrade faster. Toyota warrants the battery for 8 years/100,000 miles; owners report the Prius C did not receive the 10-year/150,000-mile CARB-state extension given to the liftback, so confirm in the warranty booklet.
Common Symptoms
- Decreased fuel economy (5-10 MPG loss)
- Hybrid battery gauge fluctuates rapidly
- Engine runs more than usual
- Triangle warning light on dashboard
- Reduced electric-only driving range
How to Fix
Check warranty coverage first — 8 years/100,000 miles standard; owners report the Prius C does not carry the 10-year/150,000-mile CARB-state coverage, so confirm in your warranty booklet. If out of warranty, the full battery pack replacement costs $2,000-$3,500 at a dealer. Aftermarket remanufactured packs cost $1,200-$2,000 with a warranty. Individual cell replacement by a hybrid specialist ($800-$1,500) can extend pack life. Green Bean Battery and AISIN offer remanufactured packs with warranties.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Greentec Auto 2012-2017 Prius C hybrid battery with new cells
replace a professionally diagnosed failed 2012-2017 Prius c traction-battery pack as a complete matched assembly Fitment/availability: 2012-2017 Prius C, 20-module 6.5-Ah NiMH pack; not approved here for source years 2018-2019, and core,…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipBefore paying for a full pack replacement, find a hybrid specialist who can test individual cells. Often only 2-3 cells out of 120 are bad. Cell-level repair costs $800-$1,200 and buys you another 50k+ miles.
Sources for this issue (2)
Toyota Sienna · 2021–2025
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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 $800 to $7,000, depending on the vehicle and root cause.
Which vehicles are affected by P3000?
Au7o has documented P3000 across 4 vehicle models from 2 manufacturers: Lexus, Toyota.
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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.