12 V battery discharging
Severity 1/3 · AnnoyingThe small 12 V auxiliary battery, not the hybrid battery, is the fault most often reported: it runs flat on short trips, after prolonged standing or with accessories permanently connected (WhoCanFixMyCar), and repeated discharges wear it out prematurely. When too weak, it prevents the hybrid system from starting (CarVerif). 12% of owners surveyed by What Car? cite problems with the 12 V battery, bodywork or infotainment. Owners of the Corolla Touring Sports report batteries going flat repeatedly (Toyota Owners Club).
- Versions
- Hybride 122, Hybride 184
- Onset
- not documented
- Repair
- not documented
Sources
- Used Toyota Corolla 2019-present reliability review — What Car? (new tab)
- Common problems with the Toyota Corolla — WhoCanFixMyCar (new tab)
- Fiabilité Toyota Corolla XII 1.8 Hybrid 122 (2ZR-FXE) — CarVerif (new tab)
- Fiabilité Toyota Corolla XII 2.0 Hybrid 184 (M20A-FXS) — CarVerif (new tab)
- Corolla Touring Sport Excel 2.0 — another flat battery — Toyota Owners Club (new tab)
- Battery problem with Toyota Corolla Tourer hybrid — Toyota Owners Club (new tab)