P0A80 Code: Replace Hybrid Battery Pack — Causes & Fix
P0A80 means the hybrid battery pack has degraded to the point the system requests replacement — one or more cell blocks are weak or imbalanced.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $1,000 – $4,000
- Time to fix
- 1–4 hours
What it means
Causes are age/wear of the high-voltage battery, a weak cell block, or a cooling problem accelerating degradation. P0A80 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine + hybrid/red triangle warning
- Reduced fuel economy and EV assist
- Possible reduced power
How to fix it
- 1
Have the pack tested by module
1. A hybrid specialist can test each cell block to find weak modules.
- 2
Repair or replace the pack
1. Replace weak modules or the full pack. 2. Ensure the battery cooling fan/filter is clean to protect the new pack, then clear the code.
Frequently asked questions
Does P0A80 always mean a whole new battery?
Not always — often a few weak modules can be replaced or reconditioned. A proper block-by-block test tells you what's actually needed.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.