A C-testable motion estimation (CTME) design to efficiently detect the faults in process elements (Pes) is presented. The goal of the CTME design is to offer high reliability for video coding systems. The proposed CTME was carried out by Verilog HDL (very high speed integrated circuit hardware description language) and synthesized with the TSMC (Taiwan Semiconductor Manufacturing Company) 0.18 μm CMOS technology. Logic simulation results show that the proposed CTME guarantees 100% fault coverage with only 8 sets of test patterns. Design verification and comparisons also demonstrate that the area overhead of the proposed CTME is about 4.8% with little delay penalty.