Toyota Sienna hybrid battery corrosion issue and replacement details on Toyota Sienna

Some Toyota Sienna owners report experiencing corrosion on the 12V battery terminals, which can lead to electrical connectivity issues and potentially prevent the vehicle from starting. Additionally, owners facing battery problems, such as decreased fuel economy or performance drops, may need to consider battery replacement, with costs ranging from $1,000 to $3,000 depending on the model and labor charges. To prevent the auxiliary battery from discharging during storage, some owners emphasize the importance of proper maintenance, including ensuring the shift lever is in the “P” position before disconnecting the battery. Furthermore, there have been reports of a battery drain issue related to the Data Communication Module (DCM), which was addressed with a software update for early 2021 models, and owners of 2022 models are advised to confirm that this update is installed. It is recommended that owners experiencing these battery-related issues consult with a professional for further assistance.