Download ISSUE Some 2002-2006 Explorer/Mountaineer and 2003-2005 Aviator vehicles may exhibit a customer complaint of the fuel gauge being slow to read full after refueling, the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0463, instrument cluster DTC B1201, and/or the fuel gauge dropping to empty. This may be due to the fuel level sender assembly sending incorrect data to the instrument cluster and/or powertrain control module (PCM). ACTION Refer to the following General Information for a description of two (2) modes of fuel gauge operation prior to following the TSB Service Procedure. This brief explanation of current fuel gauge strategy will help ensure the correct diagnosis is made. The fuel gauge on these vehicles has several distinct modes of operation. The difference in the various modes is the speed at which the fuel gauge pointer moves in relationship to fuel level input from the fuel level sender. After reviewing the General Information, refer to the TSB Service Procedure. GENERAL INFORMATION Fuel gauge strategy provides several modes of operation. One being referred to as Fast Acquire Mode and another as Slosh Mode.