P0A80: How to Diagnose & Fix — Replace Hybrid Battery Pack
15 vehicles · 8 makes · $60-$9,000 repair
How to diagnose and fix P0A80: 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.
Toyota Prius · 2004–2015
Gen 2 (2004-2009) and Gen 3 (2010-2015) Prius NiMH battery packs commonly fail between 8-15 years. Individual cell degradation causes voltage imbalances, triggering warning lights and reduced performance. Battery cooling fan clogging accelerates failure.
Common Symptoms
- Red triangle warning light
- P0A80 code - Replace Hybrid Battery Pack
- Decreased fuel economy
- Reduced power and acceleration
- Battery SOC fluctuating rapidly
How to Fix
Replace hybrid battery pack or individual failed cells. Toyota OEM pack costs $2,200-$3,500. Refurbished options from Green Bean Battery ($1,500 with warranty) or Dorman (587-001 for Gen 2, 587-003 for Gen 3). DIY cell replacement possible with individual cells ($20-40 each). Clean battery cooling fan first - located behind rear seat on driver side.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Greentec Auto 2004-2009 Prius hybrid battery with new cells
replace a professionally diagnosed failed Gen-2 traction-battery pack as a complete matched assembly Fitment/availability: 2004-2009 Prius Gen 2 NiMH pack, 200 V and 28 modules; confirm VIN, service area, core deposit/return and warranty…
- Greentec Auto 2010-2015 Prius hybrid battery with new cells
replace a professionally diagnosed failed Gen-3 liftback traction-battery pack as a complete matched assembly Fitment/availability: 2010-2015 Prius Gen 3 liftback NiMH pack, 6.5 Ah and 28 modules; not a Prius v or Plug-in pack, and core/…
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Sources for this issue (1)
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.
Ford Fusion · 2010–2020
Ford Fusion Hybrid spans two generations with different high-voltage batteries — degradation patterns differ. 1st-gen 2010-2012 (NiMH, ~1.4 kWh): typical degradation appears at 100,000-150,000 miles with reduced EV-mode range and increased ICE intervention. Replacement runs $2,500-$4,000 at independent hybrid specialists. 2nd-gen 2013-2020 (Lithium-ion, ~1.4 kWh): better thermal management has led to longer life on average but cell imbalance issues appear at 150,000+ miles. 'Stop Safely Now' warnings often precede full failure. 2013-2020 Energi PHEV variants share the architecture but with larger 7.6 kWh batteries — separate degradation curve. Owners should check cell balance via OBD-II scanner with hybrid module support (Forscan recommended).
Common Symptoms
- Reduced electric-only driving range
- Decreased fuel economy (gradual decline)
- "Check Hybrid System" warning on dashboard
- Slower-than-normal acceleration or power loss
- Battery charge indicator drops faster than normal
- Unusual noise from battery compartment area
- Vehicle fails to start (complete battery failure)
- Hybrid system shuts down and runs on gasoline only
How to Fix
Check warranty first - Ford covers 8yr/100k miles (10yr/150k in CA, CT, MA, ME, MD, NJ, NY, OR, PA, RI, VT, WA states). If out of warranty, aftermarket/remanufactured battery packs from GreenTecAuto ($1,550-2,950 installed) are significantly cheaper than dealer replacement ($4,000-7,000). Individual cell replacement at specialized hybrid shops ($800-2,000) is an option if only specific cells have failed. Battery reconditioning is a temporary fix that may restore 60-80% of capacity for $300-800.
Sources for this issue (1)
Lexus ES · 2013–2019
Toyota Highlander · 2006–2013
Find P0A80 by make
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P0A80 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 P0A80 mean?
P0A80 stands for "Replace Hybrid Battery Pack." This code appears on hybrid and some electric vehicles and is a direct instruction that the high-voltage hybrid/traction battery pack needs to be replaced because one or more cells or modules have degraded beyond the system's acceptable limits. The battery management system continuously monitors each module's voltage, temperature, and capacity, and when the cells fall too far out of balance or lose too much capacity, it sets this code. You may notice reduced fuel economy, less electric assist, a flashing dashboard battery warning, or the vehicle entering a reduced-power mode. While the code names battery replacement, the true cause is often just one or a few weak modules rather than the whole pack.
What are the most common causes of P0A80?
The most common causes of P0A80 are: Aged or degraded hybrid battery cells/modules losing capacity, One or more weak modules causing cell imbalance, Internal cell resistance increase from heat and age, Poor battery pack cooling (clogged fan/filter, weak coolant pump), Corroded or loose high-voltage bus bar connections, Faulty battery module temperature or voltage sensor, Failed battery management/ECU module misreading cells (less common). The specific cause varies by vehicle.
How much does it cost to fix P0A80?
Repair costs for P0A80 range from $60 to $9,000, depending on the vehicle and root cause.
Which vehicles are affected by P0A80?
Au7o has documented P0A80 across 15 vehicle models from 8 manufacturers: Chevrolet, Ford, Jeep, Kia, Lexus, Mercedes-Benz, Toyota, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.