Gillig LLC (Gillig) is recalling certain model year 2015-2016 Low Floor compressed natural gas (CNG) transit buses manufactured September 1, 2015, to December 5, 2016, equipped with Amerex SafetyNet fire suppression system panel/controller units. These buses have gas detection electronics that may be disabled without providing the operator with a warning of a system malfunction. Affected display panel/controller units were also provided as replacement parts for warranty claims, part numbers 16389, 24109, 24918, 24926 and 24927.