The two affected vehicle plants are Dongfeng Nissan and Dongfeng Honda in Hubei province, Xinhua reported.
Though the two plants remain operational, their managements fear production and sales might be affected starting April.
Dongfeng Honda said its parts inventory was enough to sustain production for the rest of this month, but supply of parts for April was uncertain.
Japan is the leading trade partner of the vehicle industry in the province, with last year’s two-way trade totaling $2.19 billion.
The catastrophic quake and ensuing tsunami that hit Japan March 11 have left 5,178 people dead till Thursday morning, Japan’s National Police Agency said, adding that a total of 8,606 people were unaccounted for.