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diff --git a/Marlin/src/feature/controllerfan.cpp b/Marlin/src/feature/controllerfan.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(USE_CONTROLLER_FAN)
+
+#include "controllerfan.h"
+#include "../module/stepper/indirection.h"
+#include "../module/temperature.h"
+
+ControllerFan controllerFan;
+
+uint8_t ControllerFan::speed;
+
+#if ENABLED(CONTROLLER_FAN_EDITABLE)
+  controllerFan_settings_t ControllerFan::settings; // {0}
+ #else
+   const controllerFan_settings_t &ControllerFan::settings = controllerFan_defaults;
+#endif
+
+void ControllerFan::setup() {
+  SET_OUTPUT(CONTROLLER_FAN_PIN);
+  init();
+}
+
+void ControllerFan::set_fan_speed(const uint8_t s) {
+  speed = s < (CONTROLLERFAN_SPEED_MIN) ? 0 : s; // Fan OFF below minimum
+}
+
+void ControllerFan::update() {
+  static millis_t lastMotorOn = 0,    // Last time a motor was turned on
+                  nextMotorCheck = 0; // Last time the state was checked
+  const millis_t ms = millis();
+  if (ELAPSED(ms, nextMotorCheck)) {
+    nextMotorCheck = ms + 2500UL; // Not a time critical function, so only check every 2.5s
+
+    #define MOTOR_IS_ON(A,B) (A##_ENABLE_READ() == bool(B##_ENABLE_ON))
+    #define _OR_ENABLED_E(N) || MOTOR_IS_ON(E##N,E)
+
+    const bool motor_on = (
+      ( DISABLED(CONTROLLER_FAN_IGNORE_Z) &&
+        (    MOTOR_IS_ON(Z,Z)
+          || TERN0(HAS_Z2_ENABLE, MOTOR_IS_ON(Z2,Z))
+          || TERN0(HAS_Z3_ENABLE, MOTOR_IS_ON(Z3,Z))
+          || TERN0(HAS_Z4_ENABLE, MOTOR_IS_ON(Z4,Z))
+        )
+      ) || (
+        DISABLED(CONTROLLER_FAN_USE_Z_ONLY) &&
+        (    MOTOR_IS_ON(X,X) || MOTOR_IS_ON(Y,Y)
+          || TERN0(HAS_X2_ENABLE, MOTOR_IS_ON(X2,X))
+          || TERN0(HAS_Y2_ENABLE, MOTOR_IS_ON(Y2,Y))
+          #if E_STEPPERS
+            REPEAT(E_STEPPERS, _OR_ENABLED_E)
+          #endif
+        )
+      )
+    );
+
+    // If any of the drivers or the heated bed are enabled...
+    if (motor_on || TERN0(HAS_HEATED_BED, thermalManager.temp_bed.soft_pwm_amount > 0))
+      lastMotorOn = ms; //... set time to NOW so the fan will turn on
+
+    // Fan Settings. Set fan > 0:
+    //  - If AutoMode is on and steppers have been enabled for CONTROLLERFAN_IDLE_TIME seconds.
+    //  - If System is on idle and idle fan speed settings is activated.
+    set_fan_speed(
+      settings.auto_mode && lastMotorOn && PENDING(ms, lastMotorOn + SEC_TO_MS(settings.duration))
+      ? settings.active_speed : settings.idle_speed
+    );
+
+    // Allow digital or PWM fan output (see M42 handling)
+    WRITE(CONTROLLER_FAN_PIN, speed);
+    analogWrite(pin_t(CONTROLLER_FAN_PIN), speed);
+  }
+}
+
+#endif // USE_CONTROLLER_FAN