We report on low-temperature dielectric response of Pr0.6Ca0.4MnO3 (PCMO), member of manganite family showing colossal magnetoresistance. Room temperature "colossal'' dielectric function is decreasing with lowering temperature, accompanied by disappearance of dielectric relaxation toward very low frequencies. This behaviour indicates that large dielectric constant in PCMO arises from the Schottky barriers at electrical contacts. Weak anomaly at the charge ordering temperature can also be attributed to interplay of sample and contact resistance. Magnetic field at temperatures T>50K shifts dielectric relaxation to higher frequencies. However, at T<50 K, where "colossal'' dielectric response is already frozen, magnetic field increases dielectric constant (and function) uniformly in the whole measured frequency range. This frequency insensitivity cannot be understood from the simplest equivalent circuit that includes Schottky contacts. It indicates that dielectric response at these temperatures is completely. flattened by strong magnetic correlations. We comment our results in relation with other magnetic field induced phenomena. (C) 2007 Elsevier B.V. All rights reserved..