MajorCommonElectrical

Toyota Alphard: Hybrid NiMH Battery Pack Capacity Degradation

Hybrid NiMH Battery Pack Capacity Degradation is a common electrical fault on the Toyota Alphard on the 2011–2015 cars, and we rate it major. Putting it right costs $3,500 to $9,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 52 documented faults on the Toyota Alphard.

Vehicle: Toyota Alphard
Years: 2011–2015
Fuel: hybrid
Gearbox: cvt
System: Electrical

This page covers the Toyota Alphard as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Toyota Alphard faults52 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The AHH20 Alphard Hybrid uses a nickel-metal hydride high-voltage battery pack (288V nominal) that degrades with age and charge cycles. At 10 or more years old and 120,000–180,000 km, capacity typically falls to 60–70% of original, reducing EV-mode duration and fuel economy significantly. In advanced degradation, DTC P0A80 (Replace Hybrid Battery Pack) triggers limp mode and the triangle warning light. Replacement requires specialist high-voltage tooling and training; refurbished cell packs from Japan are the common NZ/AU solution.

What you would notice

Fuel economy worse than 9–10 L/100km in mixed driving
EV mode indicator rarely or never activates
Hybrid system triangle warning light on dash
Frequent engine starts during low-speed crawl

How to check it

Where to look. Under the rear cargo floor or beneath the second-row seat

Connect Toyota Techstream (or equivalent) and check for DTC P0A80 and related HV battery codes.
Request a state-of-health percentage from the battery ECU — below 70% indicates near-term replacement.
Observe EV operation during a test drive at 20–40 km/h: the engine should cut out on light throttle.
Check battery cooling fan operation — blockage accelerates degradation.
Inspect for previous battery servicing or cell replacement receipts.

What it costs to put right

$3,500 to $9,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the hybrid battery ever been health-tested or replaced?”
“What is the current real-world fuel economy in mixed driving?”
“Has the triangle hybrid warning light ever appeared?”

Now check the Toyota Alphard you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Toyota Alphard buyer questions

Is hybrid nimh battery pack capacity degradation serious on a Toyota Alphard?

We rate it major and common on the Toyota Alphard. The AHH20 Alphard Hybrid uses a nickel-metal hydride high-voltage battery pack (288V nominal) that degrades with age and charge cycles. At 10 or more years old and 120,000–180,000 km, capacity typically falls to 60–70% of original, reducing EV-mode duration and fuel economy significantly. In advanced degradation, DTC P0A80 (Replace Hybrid Battery Pack) triggers limp mode and the triangle warning light. Replacement requires specialist high-voltage tooling and training; refurbished cell packs from Japan are the common NZ/AU solution.

How much does it cost to fix on a Toyota Alphard?

$3,500 to $9,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Toyota Alphard years are affected?

Our research records this fault on the 2011–2015 Toyota Alphard. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Connect Toyota Techstream (or equivalent) and check for DTC P0A80 and related HV battery codes. Request a state-of-health percentage from the battery ECU — below 70% indicates near-term replacement. Observe EV operation during a test drive at 20–40 km/h: the engine should cut out on light throttle. Check battery cooling fan operation — blockage accelerates degradation. Inspect for previous battery servicing or cell replacement receipts. Look here: Under the rear cargo floor or beneath the second-row seat