What does code 59 mean on the chevrolet malibu?

Code 59 on the Chevrolet Malibu means that the transmission fluid temperature is too low. The transmission temperature sensor can go bad.The Transmission Oil Temperature Sensor is used in automotive applications to monitor the temperature of transmission fluid and provide feedback to prevent overheating of the transmission, which can cause performance and reliability issues. One light that You never want to see illuminated is the transmission temperature gauge warning light. Excessive heat is the enemy of Your vehicle's transmission and is responsible for many transmission problems. If You see this light come on, You should take immediate action.