In 20to 30 km speed there was a little humming noise in the 1.4 diesel creta after 1000 kms . is it a big problem sir?

@SVP in 20to 30 km speed there was a little humming noise in the 1.4 diesel creta after 1000 kms . is it a big problem sir?

Question asked from: http://www.carandbike.com/hyundai-cars/creta/14-base-diesel