P0A80 on Toyota
Replace Hybrid Battery Pack
P0A80 on Toyota vehicles indicates replace hybrid battery pack. Au7o has documented this code across 2 Toyota models — most commonly on Prius C, Sienna. 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. Typical repair costs on Toyota range from $800 to $7,000, depending on the specific model and root cause.
Common Causes of P0A80
- •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)
P0A80 on Toyota by Model
Toyota Prius C(1 issue)
- Hybrid Battery Pack Degradation2012-2019
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 (10 years/150,000 in CARB states).
Toyota Sienna(1 issue)
- Hybrid Battery Performance Degradation Signs2021-2025
The 2021+ Sienna is hybrid-only with a 1.9 kWh nickel-metal hydride battery pack. Some early adopters are reporting signs of hybrid battery performance degradation including reduced electric-only driving range, the gasoline engine running more frequently than expected, decreased overall fuel economy compared to when the vehicle was new, and the battery charge gauge not reaching full charge. While Toyota hybrid batteries are generally very reliable, the Sienna hybrid system works the battery harder than the Prius due to the heavier vehicle weight and more frequent engine-off coasting demands.
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View P0A80 across all makes →Frequently Asked Questions
What does P0A80 mean on Toyota?▼
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. On Toyota specifically, this code is documented across 2 models.
What causes P0A80 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0A80 on a Toyota?▼
Repair costs on Toyota range from $800 to $7,000, depending on the specific model and root cause.
Which Toyota models have P0A80 documented?▼
Au7o has documented P0A80 on 2 Toyota models: Prius C, Sienna.