Involved in the degradation of methyl tert-butyl ether (MTBE). Catalyzes the conversion of 2-methyl 1,2-propanediol (2-M1,2-PD) to hydroxyisobutyraldehyde. 2-methylpropane-1,2-diol + NAD(+) = 2-hydroxy-2-methylpropanal + H(+) + NADH Induced in the presence of MTBE or tert-butyl alcohol (TBA). Belongs to the GMC oxidoreductase family.