Toyota Corolla completely dead with key fob not unlocking or starting the engine on Toyota Corolla

Some Toyota Corolla owners report experiencing issues where their vehicle is completely dead, and the key fob is unable to unlock or start the engine. These problems may stem from a weak or dead key fob battery, which prevents communication with the vehicle. Additionally, corrosion on the battery terminals or a weak vehicle battery can contribute to starting difficulties. Some owners have found that an expired remote connect service can also lead to engine start issues. A dead 12V battery is a common cause of key fob malfunctions in the Corolla, and electrical problems may arise after a battery change, requiring further diagnosis. In some cases, issues with the transponder chip in the key can affect remote start systems and engine ignition. To address these concerns, owners are advised to check and replace the key fob battery, inspect the vehicle's battery for corrosion, renew the remote connect service if needed, and consider diagnostic testing for any underlying electrical issues.