diff --git a/VECTO/GUI/VehicleForm.Designer.vb b/VECTO/GUI/VehicleForm.Designer.vb
index fef16cd2627339423a7329bb49e201f3d0ec4e10..a62e3c187fb67f2e0a9f482858ee2cd81ad748d1 100644
--- a/VECTO/GUI/VehicleForm.Designer.vb
+++ b/VECTO/GUI/VehicleForm.Designer.vb
@@ -1517,11 +1517,14 @@ Partial Class VehicleForm
         '
         'cbEmPos
         '
+        Me.cbEmPos.DisplayMember = "Value"
+        Me.cbEmPos.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList
         Me.cbEmPos.FormattingEnabled = true
         Me.cbEmPos.Location = New System.Drawing.Point(110, 52)
         Me.cbEmPos.Name = "cbEmPos"
         Me.cbEmPos.Size = New System.Drawing.Size(153, 21)
         Me.cbEmPos.TabIndex = 1
+        Me.cbEmPos.ValueMember = "Key"
         '
         'lblEmCount
         '
diff --git a/VECTO/GUI/VehicleForm.vb b/VECTO/GUI/VehicleForm.vb
index f91a8c0c23af3426cab71e09c47e6a79bdd5520b..59d0dd389adee100d3ec60665f9a192e41a6841b 100644
--- a/VECTO/GUI/VehicleForm.vb
+++ b/VECTO/GUI/VehicleForm.vb
@@ -1230,7 +1230,14 @@ Public Class VehicleForm
 		gbRatiosPerGear.Enabled = cbEmPos.SelectedValue.Equals(PowertrainPosition.HybridP2_5)
 
 		if (VehicleType.IsOneOf(VectoSimulationJobType.BatteryElectricVehicle, VectoSimulationJobType.SerialHybridVehicle)) then
-			gbRetarderLosses.Enabled = PowertrainPosition.BatteryElectricE3.Equals(cbEmPos.SelectedValue)
+			if (PowertrainPosition.BatteryElectricE3.Equals(cbEmPos.SelectedValue)) then
+				gbRetarderLosses.Enabled = true
+			else
+				gbRetarderLosses.Enabled = false
+				CbRtType.SelectedValue = RetarderType.None
+				TbRtRatio.Text = ""
+				TbRtPath.Text = ""
+			end if
 		end if
 	End Sub