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diff --git a/Marlin/src/gcode/control/M42.cpp b/Marlin/src/gcode/control/M42.cpp
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+++ b/Marlin/src/gcode/control/M42.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 "../../inc/MarlinConfig.h"
+
+#if ENABLED(DIRECT_PIN_CONTROL)
+
+#include "../gcode.h"
+#include "../../MarlinCore.h" // for pin_is_protected
+
+#if HAS_FAN
+  #include "../../module/temperature.h"
+#endif
+
+void protected_pin_err() {
+  SERIAL_ERROR_MSG(STR_ERR_PROTECTED_PIN);
+}
+
+/**
+ * M42: Change pin status via GCode
+ *
+ *  P<pin>  Pin number (LED if omitted)
+ *          For LPC1768 specify pin P1_02 as M42 P102,
+ *                                  P1_20 as M42 P120, etc.
+ *
+ *  S<byte> Pin status from 0 - 255
+ *  I       Flag to ignore Marlin's pin protection
+ *
+ *  M<mode> Pin mode: 0=INPUT  1=OUTPUT  2=INPUT_PULLUP  3=INPUT_PULLDOWN
+ */
+void GcodeSuite::M42() {
+  const int pin_index = PARSED_PIN_INDEX('P', GET_PIN_MAP_INDEX(LED_PIN));
+  if (pin_index < 0) return;
+
+  const pin_t pin = GET_PIN_MAP_PIN(pin_index);
+
+  if (!parser.boolval('I') && pin_is_protected(pin)) return protected_pin_err();
+
+  if (parser.seenval('M')) {
+    switch (parser.value_byte()) {
+      case 0: pinMode(pin, INPUT); break;
+      case 1: pinMode(pin, OUTPUT); break;
+      case 2: pinMode(pin, INPUT_PULLUP); break;
+      #ifdef INPUT_PULLDOWN
+        case 3: pinMode(pin, INPUT_PULLDOWN); break;
+      #endif
+      default: SERIAL_ECHOLNPGM("Invalid Pin Mode"); return;
+    }
+  }
+
+  if (!parser.seenval('S')) return;
+  const byte pin_status = parser.value_byte();
+
+  #if HAS_FAN
+    switch (pin) {
+      #if HAS_FAN0
+        case FAN0_PIN: thermalManager.fan_speed[0] = pin_status; return;
+      #endif
+      #if HAS_FAN1
+        case FAN1_PIN: thermalManager.fan_speed[1] = pin_status; return;
+      #endif
+      #if HAS_FAN2
+        case FAN2_PIN: thermalManager.fan_speed[2] = pin_status; return;
+      #endif
+      #if HAS_FAN3
+        case FAN3_PIN: thermalManager.fan_speed[3] = pin_status; return;
+      #endif
+      #if HAS_FAN4
+        case FAN4_PIN: thermalManager.fan_speed[4] = pin_status; return;
+      #endif
+      #if HAS_FAN5
+        case FAN5_PIN: thermalManager.fan_speed[5] = pin_status; return;
+      #endif
+      #if HAS_FAN6
+        case FAN6_PIN: thermalManager.fan_speed[6] = pin_status; return;
+      #endif
+      #if HAS_FAN7
+        case FAN7_PIN: thermalManager.fan_speed[7] = pin_status; return;
+      #endif
+    }
+  #endif
+
+  pinMode(pin, OUTPUT);
+  extDigitalWrite(pin, pin_status);
+  analogWrite(pin, pin_status);
+}
+
+#endif // DIRECT_PIN_CONTROL