Vehicular Ad Hoc Network (VANET) is the special branch of the Mobile Ad Hoc Network. MANET has un-controlled moving patterns of a number of nodes where as VANET has restricted node movement by factors like a road course, traffic and traffic regulations because VANET is formed mainly by vehicles. VANET is the collection of information on moving vehicles throughout the period of communication. Security in VANET is a complex issue. Black hole attack is one of the possible attacks on AODV routing protocol in vehicular ad hoc networks. In this attack, a malicious node advertises itself as having freshest or shortest path to specific node to absorb packets to it. The effect of Black hole attack on Adhoc network using AODV as a routing protocol will be studied in this paper. The proposed solution that is capable of detecting and removing Black hole nodes in the VANET.