KNOWN FAULTS · Toyota

Toyota Yaris Cross 1.5 Hybrid common problems.

2021–2026 · Hybrid

Sources are not verified in real time and no entry confirms that your car is affected.

2 known faults with sources

Applies if: The Toyota USA bulletin does not list this model, but its hybrid battery is also cooled with cabin air through a filter.

Clogged hybrid battery cooling fan and filterHigh-voltage battery

Engine / equipment: Hybrid battery cooled with cabin air (intake next to the rear seat): Prius, Yaris, Auris, Corolla, C-HR, RAV4, Camry and others
Period mentioned: 2003 onwards
Symptoms: Hybrid battery cooling maintenance message, warning light with codes P0A80 or P0A7F, a noisy fan and less electric assistance; if ignored, the battery ages faster.
Possible cause described: Dust, pet hair or dirt block the filter and fan that cool the battery; so do objects covering the intake. Toyota USA issued bulletin T-SB-0074-20 (2003–2020 Prius and Camry, Corolla, Highlander, RAV4 and Mirai hybrids up to 2020) and recommends cleaning the filter every 5,000 miles (about 8,000 km).
Check for the garage: Clean or replace the filter and clean the fan before condemning the battery; keep the intake grille clear. At the garage, read the codes and, if needed, install the software Toyota specifies.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Built before February 2024 (since then they have a higher-capacity 12 V battery).

Will not start because of a flat 12 V battery on the Yaris and Yaris Cross hybridsElectrical and electronic systems

Engine / equipment: 1.5 hybrid: fourth-generation Toyota Yaris and Yaris Cross
Period mentioned: 2020–2024
Symptoms: After a few days parked, the car will not start (it does not go to “Ready”) because the auxiliary 12 V battery is very low or flat. It mainly affects people who drive few kilometres.
Possible cause described: According to an internal 2024 Toyota technical note reported by L'argus (March 2025), the original 12 V battery was too small to recharge quickly enough while driving. Since February 2024, Yaris and Yaris Cross built in France and the Czech Republic have an LN0 12 V 35 Ah battery with twice the charge capacity.
Check for the garage: Measure and test the 12 V battery. If the car was built before February 2024, ask Toyota to replace it with the new higher-capacity battery (the part number depends on whether the battery was fitted before or after October 2024). In the meantime, make somewhat longer trips or use a battery maintainer if the car stays parked for days.
Cost cited in the source: Toyota replaces it under the 3-year or 100,000 km warranty.A rough figure from the original database, not an up-to-date quote.