P0A80 on Ford
Replace Hybrid Battery Pack
P0A80 on Ford vehicles indicates replace hybrid battery pack. Au7o has documented this code across 2 Ford models — most commonly on C-Max, Fusion. 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 Ford range from $150 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 Ford by Model
Ford C-Max(1 issue)
- Hybrid Battery Pack Degradation and "Stop Safely Now" Warning2013-2018
The C-Max hybrid battery pack (lithium-ion in Energi, NiMH in Hybrid) can exhibit cell imbalance and capacity degradation, triggering the "Stop Safely Now" warning message. This disables the hybrid system and forces the vehicle into a reduced-power limp mode. The Energi plug-in version's lithium pack generally holds up better than the base Hybrid's NiMH cells. Ford's 8-year/100,000-mile battery warranty covers most failures, but out-of-warranty replacement is costly.
Ford Fusion(1 issue)
- Hybrid High-Voltage Battery Degradation and Failure2010-2020
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).
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View P0A80 across all makes →Frequently Asked Questions
What does P0A80 mean on Ford?▼
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 Ford specifically, this code is documented across 2 models.
What causes P0A80 on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $150 to $7,000, depending on the specific model and root cause.
Which Ford models have P0A80 documented?▼
Au7o has documented P0A80 on 2 Ford models: C-Max, Fusion.