Index: dialin/common/msg_ids.py
===================================================================
diff -u -r11b3f6f190446f11633a31aa05bc332e57d3e2d6 -r206fbc70f59d5b96203f24295ca2a2e7860289c2
--- dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 11b3f6f190446f11633a31aa05bc332e57d3e2d6)
+++ dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 206fbc70f59d5b96203f24295ca2a2e7860289c2)
@@ -476,7 +476,7 @@
     MSG_ID_DG_SET_SW_CONFIG_RECORD = 0xA04B
     MSG_ID_DG_SEND_SW_CONFIG_RECORD = 0xA04C
     MSG_ID_DG_FANS_DUTY_CYCLE_OVERRIDE = 0xA04D
-    MSG_ID_MSG_AVAILABLE_42 = 0xA04E
+    MSG_ID_DG_MODE_FILL_ENABLE_CHEMS_TEST = 0xA04E
     MSG_ID_DG_SET_FANS_RPM_ALARM_START_TIME_OFFSET = 0xA04F
     MSG_ID_MSG_AVAILABLE_43 = 0xA050
     MSG_ID_FILL_MODE_DATA_PUBLISH_INTERVAL_OVERRIDE = 0xA051
Index: dialin/dg/dialysate_fill.py
===================================================================
diff -u -rb325782a4c7ab9446c8c78259a5b8c8fe5bf7ef5 -r206fbc70f59d5b96203f24295ca2a2e7860289c2
--- dialin/dg/dialysate_fill.py	(.../dialysate_fill.py)	(revision b325782a4c7ab9446c8c78259a5b8c8fe5bf7ef5)
+++ dialin/dg/dialysate_fill.py	(.../dialysate_fill.py)	(revision 206fbc70f59d5b96203f24295ca2a2e7860289c2)
@@ -148,7 +148,6 @@
         @param reset: (int) 1 to reset a previous override, 0 to override
         @return: 1 if successful, zero otherwise
         """
-
         rst = integer_to_bytearray(reset)
         vol = float_to_bytearray(volume)
         payload = rst + vol
@@ -177,6 +176,31 @@
             self.logger.debug("Timeout!!!!")
             return False
 
+    def cmd_set_mode_fill_enable_chemicals_conductivity_values_test(self) -> int:
+        """
+        Constructs and sends the enable mode fill chemicals conductivity values test command.
+        Constraints:
+            Must be logged into DG.
+
+        @return: 1 if successful, zero otherwise
+        """
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id,
+                                              message_id=MsgIds.MSG_ID_DG_MODE_FILL_ENABLE_CHEMS_TEST.value)
+
+        self.logger.debug("Enabling mode fill chemicals test ")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            self.logger.debug("Enabled mode fill chemicals test")
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
     def cmd_set_mode_fill_cal_check_state(self, cal_check_state: int) -> int:
         """
         Constructs and sends a message to set the mode fill calibration check status.