diff --git a/Marlin/src/core/boards.h b/Marlin/src/core/boards.h
index 1b95b2ba52..7cc9760e49 100644
--- a/Marlin/src/core/boards.h
+++ b/Marlin/src/core/boards.h
@@ -513,10 +513,11 @@
#define BOARD_BTT_OCTOPUS_PRO_V1_1 6008 // BigTreeTech Octopus Pro v1.1 (STM32H723ZE)
#define BOARD_BTT_MANTA_M8P_V2_0 6009 // BigTreeTech Manta M8P V2.0 (STM32H723ZE)
#define BOARD_BTT_KRAKEN_V1_0 6010 // BigTreeTech Kraken v1.0 (STM32H723ZG)
-#define BOARD_TEENSY41 6011 // Teensy 4.1
-#define BOARD_T41U5XBB 6012 // T41U5XBB Teensy 4.1 breakout board
-#define BOARD_FLY_D8_PRO 6013 // FLY_D8_PRO (STM32H723VG)
-#define BOARD_FLY_SUPER8_PRO 6014 // FLY SUPER8 PRO (STM32H723ZG)
+#define BOARD_TEENSY40 6011 // Teensy 4.0
+#define BOARD_TEENSY41 6012 // Teensy 4.1
+#define BOARD_T41U5XBB 6013 // T41U5XBB Teensy 4.1 breakout board
+#define BOARD_FLY_D8_PRO 6014 // FLY_D8_PRO (STM32H723VG)
+#define BOARD_FLY_SUPER8_PRO 6015 // FLY SUPER8 PRO (STM32H723ZG)
//
// Espressif ESP32 WiFi
diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
index ecf15758e0..abe4673407 100644
--- a/Marlin/src/pins/pins.h
+++ b/Marlin/src/pins/pins.h
@@ -854,8 +854,10 @@
#include "stm32h7/pins_BTT_MANTA_M8P_V2_0.h" // STM32H7 env:STM32H723ZE_btt
#elif MB(BTT_KRAKEN_V1_0)
#include "stm32h7/pins_BTT_KRAKEN_V1_0.h" // STM32H7 env:STM32H723ZG_btt
+#elif MB(TEENSY40)
+ #include "teensy4/pins_TEENSY40.h" // Teensy-4.0 env:teensy40
#elif MB(TEENSY41)
- #include "teensy4/pins_TEENSY41.h" // Teensy-4.x env:teensy41
+ #include "teensy4/pins_TEENSY41.h" // Teensy-4.1 env:teensy41
#elif MB(T41U5XBB)
#include "teensy4/pins_T41U5XBB.h" // Teensy-4.x env:teensy41
#elif MB(FLY_D8_PRO)
diff --git a/Marlin/src/pins/teensy4/env_validate.h b/Marlin/src/pins/teensy4/env_validate.h
index 5a89e8a409..38b94a636d 100644
--- a/Marlin/src/pins/teensy4/env_validate.h
+++ b/Marlin/src/pins/teensy4/env_validate.h
@@ -21,6 +21,8 @@
*/
#pragma once
-#if NOT_TARGET(IS_TEENSY41)
+#if defined(IS_TEENSY40) && NOT_TARGET(IS_TEENSY40)
+ #error "Oops! Select 'Teensy 4.0' in 'Tools > Board.'"
+#elif defined(IS_TEENSY41) && NOT_TARGET(IS_TEENSY41)
#error "Oops! Select 'Teensy 4.1' in 'Tools > Board.'"
#endif
diff --git a/Marlin/src/pins/teensy4/pins_TEENSY40.h b/Marlin/src/pins/teensy4/pins_TEENSY40.h
new file mode 100644
index 0000000000..88c8ccf97e
--- /dev/null
+++ b/Marlin/src/pins/teensy4/pins_TEENSY40.h
@@ -0,0 +1,34 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2025 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 .
+ *
+ */
+#pragma once
+
+/****************************************************************************************
+* Teensy 4.0 (IMXRT1062) Breadboard pin assignments
+* Requires the Teensyduino software with Teensy 4.0 selected in Arduino IDE!
+* https://www.pjrc.com/teensy/teensyduino.html
+****************************************************************************************/
+
+#include "env_validate.h"
+
+#define BOARD_INFO_NAME "Teensy4.0"
+
+#include "pins_TEENSY4x.h"
diff --git a/Marlin/src/pins/teensy4/pins_TEENSY41.h b/Marlin/src/pins/teensy4/pins_TEENSY41.h
index 2a8a76f17c..121514e463 100644
--- a/Marlin/src/pins/teensy4/pins_TEENSY41.h
+++ b/Marlin/src/pins/teensy4/pins_TEENSY41.h
@@ -31,99 +31,11 @@
#define BOARD_INFO_NAME "Teensy4.1"
-/**
- * Plan for Teensy 4.0 and Teensy 4.1:
- * USB
- * GND |-----#####-----| VIN (3.65 TO 5.5V)
- * X_STEP_PIN CS1 RX1 PWM 0 | ##### | GND
- * X_DIR_PIN MISO1 TX1 PWM 1 | | 3.3V
- * Y_STEP_PIN PWM 2 | | 23 A9 PWM SERVO1_PIN
- * Y_DIR_PIN PWM 3 | | 22 A8 PWM SERVO0_PIN
- * Z_STEP_PIN PWM 4 | | 21 A7 RX5
- * Z_DIR_PIN PWM 5 | | 20 A6 TX5 FILWIDTH_PIN
- * X_ENABLE_PIN PWM 6 | | 19 A5 PWM SCL0
- * Y_ENABLE_PIN RX2 PWM 7 | | 18 A4 PWM SDA0 HEATER_1_PIN
- * Z_ENABLE_PIN TX2 PWM 8 | | 17 A3 RX4 SDA1
- * E0_STEP_PIN PWM 9 | | 16 A2 TX4 SCL1 TEMP_0_PIN
- * E0_DIR_PIN PWM 10 | | 15 A1 PWM RX3 TEMP_BED_PIN
- * MOSI_PIN MOSI0 PWM 11 | | 14 A0 PWM TX3 TEMP_1_PIN
- * MISO_PIN MISO0 PWM 12 | | 13 LED PWM SCK0 SCK_PIN
- * 3.3V | | GND
- * Z_STOP_PIN PWM 24 | | 41 A17
- * E0_ENABLE_PIN PWM 25 | | 40 A16
- * FAN0_PIN MOSI1 26 | | 39 A15 MISO1 X_STOP_PIN
- * Z-PROBE PWR SCK1 27 | * * * * * | 38 A14 Y_STOP_PIN
- * SOL1_PIN RX7 PWM 28 | | 37 PWM HEATER_0_PIN
- * FAN0_PIN TX7 PWM 29 | | 36 PWM HEATER_BED_PIN
- * X_CS_PIN 30 | | 35 TX8 E1_ENABLE_PIN
- * y_CS_PIN 31 | SDCARD | 34 RX8 E1_DIR_PIN
- * Z_CS_PIN 32 |_______________| 33 PWM E1_STEP_PIN
- */
+#include "pins_TEENSY4x.h"
-//
-// Servos
-//
-#define SERVO0_PIN 22
-#define SERVO1_PIN 23
-
-//
-// Limit Switches
-//
-#define X_STOP_PIN 39
-#define Y_STOP_PIN 38
-#define Z_STOP_PIN 24
-
-//
-// Steppers
-//
-#define X_STEP_PIN 0
-#define X_DIR_PIN 1
-#define X_ENABLE_PIN 6
-//#define X_CS_PIN 30
-
-#define Y_STEP_PIN 2
-#define Y_DIR_PIN 3
-#define Y_ENABLE_PIN 7
-//#define Y_CS_PIN 31
-
-#define Z_STEP_PIN 4
-#define Z_DIR_PIN 5
-#define Z_ENABLE_PIN 8
-//#define Z_CS_PIN 32
-
-#define E0_STEP_PIN 9
-#define E0_DIR_PIN 10
-#define E0_ENABLE_PIN 25
-
-#define E1_STEP_PIN 33
-#define E1_DIR_PIN 34
-#define E1_ENABLE_PIN 35
-
-//
-// Heaters / Fans
-//
-#define HEATER_0_PIN 37
-#define HEATER_1_PIN 18
-#define HEATER_BED_PIN 36
-#ifndef FAN0_PIN
- #define FAN0_PIN 29
-#endif
-
-//
-// Temperature Sensors
-//
-#define TEMP_0_PIN 2 // Extruder / Analog pin numbering: 2 => A2
-#define TEMP_1_PIN 0
-#define TEMP_BED_PIN 1 // Bed / Analog pin numbering
-
-//
-// Misc. Functions
-//
-#define LED_PIN 13
-#define SOL0_PIN 28
-//#define PS_ON_PIN 1
-//#define FILWIDTH_PIN 6 // A6
-
-#ifndef SDCARD_CONNECTION
- #define SDCARD_CONNECTION ONBOARD
+// For the Ethernet Kit or WIZ812
+// https://www.pjrc.com/store/ethernet_kit.html
+// https://www.pjrc.com/teensy/td_libs_Ethernet.html)
+#if HAS_ETHERNET
+ #define ETHERNET_CS_PIN 10 // W5x00 module
#endif
diff --git a/Marlin/src/pins/teensy4/pins_TEENSY4x.h b/Marlin/src/pins/teensy4/pins_TEENSY4x.h
new file mode 100644
index 0000000000..251f7533b3
--- /dev/null
+++ b/Marlin/src/pins/teensy4/pins_TEENSY4x.h
@@ -0,0 +1,127 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2025 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 .
+ *
+ */
+#pragma once
+
+/****************************************************************************************
+* Teensy 4.x (IMXRT1062) Breadboard pin assignments
+* Requires the Teensyduino software with Teensy 4.0 / 4.1 selected in Arduino IDE!
+* https://www.pjrc.com/teensy/teensyduino.html
+****************************************************************************************/
+
+#include "env_validate.h"
+
+/**
+ * Plan for Teensy 4.0 and Teensy 4.1:
+ * USB
+ * GND |-----#####-----| VIN (3.65 TO 5.5V)
+ * X_STEP_PIN CS1 RX1 PWM 0 | ##### | GND
+ * X_DIR_PIN MISO1 TX1 PWM 1 | | 3.3V
+ * Y_STEP_PIN PWM 2 | | 23 A9 PWM SERVO1_PIN
+ * Y_DIR_PIN PWM 3 | | 22 A8 PWM SERVO0_PIN
+ * Z_STEP_PIN PWM 4 | | 21 A7 RX5
+ * Z_DIR_PIN PWM 5 | | 20 A6 TX5 FILWIDTH_PIN
+ * X_ENABLE_PIN PWM 6 | | 19 A5 PWM SCL0
+ * Y_ENABLE_PIN RX2 PWM 7 | | 18 A4 PWM SDA0 HEATER_1_PIN
+ * Z_ENABLE_PIN TX2 PWM 8 | | 17 A3 RX4 SDA1
+ * E0_STEP_PIN PWM 9 | | 16 A2 TX4 SCL1 TEMP_0_PIN
+ * E0_DIR_PIN PWM 10 | | 15 A1 PWM RX3 TEMP_BED_PIN
+ * MOSI_PIN MOSI0 PWM 11 | | 14 A0 PWM TX3 TEMP_1_PIN
+ * MISO_PIN MISO0 PWM 12 | | 13 LED PWM SCK0 SCK_PIN
+ * 3.3V | | GND
+ * Z_STOP_PIN PWM 24 | | 41 A17
+ * E0_ENABLE_PIN PWM 25 | | 40 A16
+ * FAN0_PIN MOSI1 26 | | 39 A15 MISO1 X_STOP_PIN
+ * Z-PROBE PWR SCK1 27 | * * * * * | 38 A14 Y_STOP_PIN
+ * SOL1_PIN RX7 PWM 28 | | 37 PWM HEATER_0_PIN
+ * FAN0_PIN TX7 PWM 29 | | 36 PWM HEATER_BED_PIN
+ * X_CS_PIN 30 | | 35 TX8 E1_ENABLE_PIN
+ * y_CS_PIN 31 | SDCARD | 34 RX8 E1_DIR_PIN
+ * Z_CS_PIN 32 |_______________| 33 PWM E1_STEP_PIN
+ */
+
+//
+// Servos
+//
+#define SERVO0_PIN 22
+#define SERVO1_PIN 23
+
+//
+// Limit Switches
+//
+#define X_STOP_PIN 39
+#define Y_STOP_PIN 38
+#define Z_STOP_PIN 24
+
+//
+// Steppers
+//
+#define X_STEP_PIN 0
+#define X_DIR_PIN 1
+#define X_ENABLE_PIN 6
+//#define X_CS_PIN 30
+
+#define Y_STEP_PIN 2
+#define Y_DIR_PIN 3
+#define Y_ENABLE_PIN 7
+//#define Y_CS_PIN 31
+
+#define Z_STEP_PIN 4
+#define Z_DIR_PIN 5
+#define Z_ENABLE_PIN 8
+//#define Z_CS_PIN 32
+
+#define E0_STEP_PIN 9
+#define E0_DIR_PIN 10
+#define E0_ENABLE_PIN 25
+
+#define E1_STEP_PIN 33
+#define E1_DIR_PIN 34
+#define E1_ENABLE_PIN 35
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN 37
+#define HEATER_1_PIN 18
+#define HEATER_BED_PIN 36
+#ifndef FAN0_PIN
+ #define FAN0_PIN 29
+#endif
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN 2 // Extruder / Analog pin numbering: 2 => A2
+#define TEMP_1_PIN 0
+#define TEMP_BED_PIN 1 // Bed / Analog pin numbering
+
+//
+// Misc. Functions
+//
+#define LED_PIN 13
+#define SOL0_PIN 28
+//#define PS_ON_PIN 1
+//#define FILWIDTH_PIN 6 // A6
+
+#ifndef SDCARD_CONNECTION
+ #define SDCARD_CONNECTION ONBOARD
+#endif
diff --git a/ini/teensy.ini b/ini/teensy.ini
index dac4b40c30..3e988b8d7c 100644
--- a/ini/teensy.ini
+++ b/ini/teensy.ini
@@ -71,10 +71,20 @@ board = teensy36
build_src_filter = ${teensy_arm.build_src_filter} +
#
-# Teensy 4.0 / 4.1 (ARM Cortex-M7)
+# Teensy 4.0 (ARM Cortex-M7)
+#
+[env:teensy40]
+extends = teensy_arm
+board = teensy40
+build_src_filter = ${teensy_arm.build_src_filter} +
+build_flags = -DIS_TEENSY40
+
+#
+# Teensy 4.1 (ARM Cortex-M7)
#
[env:teensy41]
extends = teensy_arm
board = teensy41
build_src_filter = ${teensy_arm.build_src_filter} +
+build_flags = -DIS_TEENSY41
lib_ignore =