The electrical transport properties of the polycrystalline samples La 0.7−x Pr x Ba 0.3 MnO 3 (0≤x≤0.2) have been investigated. Two metal–insulator transitions (T P1 and T P2 ) are observed in the electrical resistivity. The abnormal transport properties are considered to be a sign of a martensitic transition in the T P2 temperature region. Besides, all the samples clearly reveal the unusual low temperature resistivity minimum, presumably due to the combined effect of weak localization, electron–electron and electron–phonon scattering. The present results are discussed and possible explanations were given based on the related theory and previous reported results.