It was used during the 2013 Formula One season, where it was driven by Charles Pic and Giedo van der Garde.

[3][4] The car was unveiled on the eve of testing for the 2013 season at the Circuito de Jerez.

Lotus technical director James Allison observed details of the car's exhaust outlet that he believed contravened Article 5.8.4 of the technical regulations,[6] that prohibits the use of bodywork within a defined area with respect to the exhaust outlet.

After the initial three races of the season the CT03 received a major upgrade to improve handling and performance.

Caterham were unable to score any points in 2013 and finished the season in 11th in the Constructors' Championship.