Due to a software glitch, the computer display in the 2004 model year Grand Prix shows the wrong day of the week, Pontiac spokesman Jim Hopson told Reuters this week. Engineers overlooked the fact that 2004 is a leap year, with an extra day.

“Somehow or other, the fact that this was a leap year got missed,” Hopson reportedly said. “We are working on a solution.”

GM may be able to fix the problem by resetting the software. A more costly solution could include replacing the display unit, he added.

According to Reuters, Hopson said the redesigned Grand Prix went on sale last March, and all models since then could potentially be affected by the glitch.

The news agency noted that, despite studies showing improved quality and durability, GM has been hit by a high number of vehicle recalls this year. Last week, GM said it would recall more than four million full-size pickup trucks to replace tailgate support cables that may corrode and fracture.