P0A80: Replace hybrid battery pack
The ECU sees that the hybrid battery blocks are badly out of balance. Usually battery wear, weak modules or poor battery cooling are to blame.
| Code | P0A80 |
|---|---|
| System | Engine and transmission |
| Group | P0Axx, Hybrid and electric |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0A80 means
A hybrid’s high-voltage battery is made up of many blocks or modules in series. The control unit compares their voltages and, if one or more fall well below the rest, stores this code. It does not always mean replacing the whole battery: sometimes the fault is a single module, the internal connections or the cooling.
Most common causes
- Dirty or blocked battery cooling filter or fan (usually near the rear seats), causing the battery to run hot
- Weak 12 V battery causing false readings
- Corroded or loose internal connections between battery modules
- One or more worn battery modules
- General battery wear from age and mileage
- Faulty battery voltage sensing wiring or battery control unit
Symptoms
- Engine warning light and hybrid system warning on
- Petrol engine starts up more often
- Less power and higher fuel consumption
- Battery charge gauge rises and falls very quickly
Can you drive with P0A80?
With care You can usually drive, but the car may limit power and the fault will get worse. Get it to a garage that works on hybrids soon.
Open the bonnetthe in-depth explanation
How to check it
Check and clean the hybrid battery cooling vent, which clogs with dust and pet hair. If your reader allows it, look at the individual block voltages: the garage will want to know which ones are low.
How to read and clear P0A80 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0A80 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0A7C The engine electronics is getting too hot
- P0A7D The high voltage battery state of charge is lower than normal
- P0A7E The high voltage battery is getting too hot
- P0A7F Hybrid battery pack deterioration
- P0A81 The high voltage battery cooling fan 1 control has a broken or disconnected wire
- P0A82 The high voltage battery cooling fan 1 has got stuck
- P0A83 The high voltage battery cooling fan 1 has got stuck
- P0A84 The high voltage battery cooling fan 1 control gives a lower signal than normal
- P0A0F Engine failed to start
- P0A1F Battery energy control module fault
- P0A94 DC/DC converter performance
- P0AA6 Hybrid high-voltage system isolation fault
To understand it properly
We explain how that system works, with drawings and no waffle, in our mechanics guide: Batteries.
What does code P0A80 mean?
A hybrid’s high-voltage battery is made up of many blocks or modules in series. The control unit compares their voltages and, if one or more fall well below the rest, stores this code. It does not always mean replacing the whole battery: sometimes the fault is a single module, the internal connections or the cooling.
Can you drive with P0A80?
You can usually drive, but the car may limit power and the fault will get worse. Get it to a garage that works on hybrids soon.
How do you clear P0A80?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0A80 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
