WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Can Communication-Related DTC Code (U Code) Table (1 Of 2)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 2: Can Communication-Related DTC Code (U Code) Table (2 Of 2)