Toyota Crown: Hybrid battery degradation (GWS204 / AWS210 Crown Hybrid)

The Crown Hybrid (3.5 GWS204 from 2008, 2.5 AWS210 from 2013) uses a 288V NiMH battery that degrades with age and heat. Once modules weaken you get falling fuel economy, the engine running far more than it should, and eventually the red triangle warning with hybrid system fault codes. A thriving Australian replacement industry exists precisely because these fail: reconditioned packs run roughly $2,000-3,500 and brand-new aftermarket packs around $4,000-4,500 fitted (Hybrid Batteries Australian lists a new GWS204/AWS210 pack at $4,035). Factory battery warranty on these imports has long expired.

• Red triangle / hybrid system warning light
• Petrol engine running almost constantly, rarely driving on EV alone
• Fuel economy far worse than the ~6-8 L/100km these should achieve
• Battery charge gauge jumping rapidly between full and empty

1. 1

   On the test drive, watch the energy monitor screen: the charge level should move gradually, not bounce between extremes, and the car should crawl on electric power at low speed with a warm battery.

2. 2

   Check fuel economy on the trip computer against what the seller claims.

3. 3

   Ask a hybrid specialist for a battery health scan (about $100-150) before purchase - it reads individual block voltages.

≈A$1,840 to ≈A$4,140 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, 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.

• “Has the hybrid battery ever been replaced or reconditioned, and is there a warranty on it?”
• “Can I get a hybrid battery health check done before I buy?”
• “What fuel economy does it actually get around town?”

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.