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diff --git a/Marlin/src/gcode/temp/M105.cpp b/Marlin/src/gcode/temp/M105.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+/**
+ * M105: Read hot end and bed temperature
+ */
+void GcodeSuite::M105() {
+
+  const int8_t target_extruder = get_target_extruder_from_command();
+  if (target_extruder < 0) return;
+
+  SERIAL_ECHOPGM(STR_OK);
+
+  #if HAS_TEMP_SENSOR
+
+    thermalManager.print_heater_states(target_extruder
+      #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
+        , parser.boolval('R')
+      #endif
+    );
+
+    SERIAL_EOL();
+
+  #else
+
+    SERIAL_ECHOLNPGM(" T:0"); // Some hosts send M105 to test the serial connection
+
+  #endif
+}