CriticalCommonElectrical

Toyota Crown: 2GR-FXE Hybrid NiMH Traction Battery Capacity Degradation

2GR-FXE Hybrid NiMH Traction Battery Capacity Degradation is a common electrical fault on the Toyota Crown on the 2008–2012 cars, and we rate it critical. Putting it right costs $2,800 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 24 documented faults on the Toyota Crown.

Vehicle: Toyota Crown
Engine: 2GR-FXE
Years: 2008–2012
Fuel: hybrid
Gearbox: auto
System: Electrical

This page covers the Toyota Crown 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 Crown faults24 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 GWS204 Crown Hybrid uses the same Panasonic NiMH traction battery module architecture as the Lexus GS450h, comprising individual prismatic cells stacked in a temperature-managed pack beneath the rear seat. Repeated high-rate charge and discharge cycles, combined with inadequate cooling when ambient temperatures are high, cause irreversible capacity fade through lithium plating of cell plates and internal resistance rise. Once overall pack capacity drops below roughly 60 percent of original, the hybrid ECU restricts available power, reduces EV-only operation, and eventually illuminates the master warning and hybrid system warning lights.

What you would notice

Hybrid system warning light or master warning light illuminated, often with fault codes P0A7F (battery capacity low) or P3000-series
Fuel economy significantly below Toyota's published figure, with the petrol engine running almost continuously even at low speeds
State of charge gauge oscillating rapidly or refusing to reach full charge
Reduced or absent EV-only drive mode at low speeds

How to check it

Where to look. High-voltage NiMH battery pack located beneath the rear passenger seat and boot floor

Also check the battery cooling fan inlet (under the rear seat) for blockage with debris. If a workshop inspection is possible: Scan the hybrid battery ECU with a Toyota Techstream diagnostic tool to read individual cell block voltages and state-of-charge balance. A spread greater than 0.2 V between the weakest and strongest cell blocks during a standardised load test indicates significant degradation.

What it costs to put right

$2,800 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 tested with Techstream for individual cell balance, and can you share the report?”
“Has any hybrid system warning light appeared, and if so what was the diagnosed fault?”

Now check the Toyota Crown 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 Crown buyer questions

Is 2gr-fxe hybrid nimh traction battery capacity degradation serious on a Toyota Crown?

We rate it critical and common on the Toyota Crown. The GWS204 Crown Hybrid uses the same Panasonic NiMH traction battery module architecture as the Lexus GS450h, comprising individual prismatic cells stacked in a temperature-managed pack beneath the rear seat. Repeated high-rate charge and discharge cycles, combined with inadequate cooling when ambient temperatures are high, cause irreversible capacity fade through lithium plating of cell plates and internal resistance rise. Once overall pack capacity drops below roughly 60 percent of original, the hybrid ECU restricts available power, reduces EV-only operation, and eventually illuminates the master warning and hybrid system warning lights.

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

$2,800 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 Crown years are affected?

Our research records this fault on the 2008–2012 Toyota Crown. 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.