That technology was not in use for several months, and NASA engineers had to guide the rover through one major trajectory adjustment using alternate means, according to Webster.
The fix, which was uploaded to the rover as it traveled through space, changed the configuration of unused data-holding locations, called registers.
NASA reported that engineers confirmed this week that the fix was successful and the star scanner is working again.
Curiosity, equipped with 10 science instruments, is expected to land on Mars in August.
The super rover is set to join the rover Opportunity, which has been working on Mars for more than six years. Opportunity has been working alone since a second rover, Spirit, stopped functioning last year.
Curiosity will collect soil and rock samples, and analyze them for evidence that the area has, or ever had, environmental conditions favorable to microbial life.
Curiosity weighs one ton and is twice as long and five times heavier than its predecessors.