diff --git a/drivers/ieee802154/Kconfig b/drivers/ieee802154/Kconfig
index af405551f63251..629b492a579978 100644
--- a/drivers/ieee802154/Kconfig
+++ b/drivers/ieee802154/Kconfig
@@ -102,6 +102,7 @@ config IEEE802154_SELECTIVE_TXCHANNEL
 
 config IEEE802154_CARRIER_FUNCTIONS
 	bool "Support for carrier functions"
+	default y if OPENTHREAD_DIAG
 	help
 	  Enable support for functions such as modulated carrier and continuous carrier.
 
diff --git a/modules/openthread/Kconfig.features b/modules/openthread/Kconfig.features
index 4c84a698c24c8f..17031467b7c556 100644
--- a/modules/openthread/Kconfig.features
+++ b/modules/openthread/Kconfig.features
@@ -144,7 +144,6 @@ config OPENTHREAD_DHCP6_SERVER
 
 config OPENTHREAD_DIAG
 	bool "Diagnostic functions support"
-	depends on IEEE802154_CARRIER_FUNCTIONS
 	help
 	  Enable OpenThread CLI diagnostic commands
 
diff --git a/modules/openthread/platform/diag.c b/modules/openthread/platform/diag.c
index b92e34209b80cb..8c53962fa5a762 100644
--- a/modules/openthread/platform/diag.c
+++ b/modules/openthread/platform/diag.c
@@ -7,9 +7,11 @@
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/gpio.h>
 
+#include <openthread/error.h>
 #include <openthread/platform/diag.h>
 
 #include "platform-zephyr.h"
+#include "zephyr/sys/util.h"
 
 /**
  * Diagnostics mode variables.
@@ -19,6 +21,8 @@ static bool sDiagMode;
 static void *sDiagCallbackContext;
 static otPlatDiagOutputCallback sDiagOutputCallback;
 
+static otError startModCarrier(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[]);
+
 static void diag_output(const char *aFormat, ...)
 {
 	va_list args;
@@ -47,10 +51,20 @@ otError otPlatDiagProcess(otInstance *aInstance, uint8_t aArgsLength, char *aArg
 	ARG_UNUSED(aInstance);
 	ARG_UNUSED(aArgsLength);
 
-	/* Add more platform specific diagnostics features here. */
-	diag_output("diag feature '%s' is not supported\r\n", aArgs[0]);
+	otError error = OT_ERROR_NOT_IMPLEMENTED;
+
+#if defined(CONFIG_IEEE802154_CARRIER_FUNCTIONS)
+	if (strcmp(aArgs[0], "modcarrier") == 0) {
+		error = startModCarrier(aInstance, aArgsLength - 1, aArgs + 1);
+	}
+#endif
+
+	if (error == OT_ERROR_NOT_IMPLEMENTED) {
+		/* Add more platform specific diagnostics features here. */
+		diag_output("diag feature '%s' is not supported\r\n", aArgs[0]);
+	}
 
-	return OT_ERROR_NOT_IMPLEMENTED;
+	return error;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -276,3 +290,30 @@ otError otPlatDiagGpioGetMode(uint32_t aGpio, otGpioMode *aMode)
 #endif /* DT_HAS_COMPAT_STATUS_OKAY(openthread_config) && \
 	* DT_NODE_HAS_PROP(DT_COMPAT_GET_ANY_STATUS_OKAY(openthread_config), diag_gpios)
 	*/
+
+#if defined(CONFIG_IEEE802154_CARRIER_FUNCTIONS)
+
+static otError startModCarrier(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[])
+{
+	ARG_UNUSED(aInstance);
+	ARG_UNUSED(aArgsLength);
+
+	bool enable = true;
+	uint8_t data[OT_RADIO_FRAME_MAX_SIZE + 1];
+
+	if (aArgsLength <= 0) {
+		return OT_ERROR_INVALID_ARGS;
+	}
+
+	if (strcmp(aArgs[0], "stop") == 0) {
+		enable = false;
+	} else {
+		if (hex2bin(aArgs[0], strlen(aArgs[0]), data, ARRAY_SIZE(data)) == 0) {
+			return OT_ERROR_INVALID_ARGS;
+		}
+	}
+
+	return platformRadioTransmitModulatedCarrier(aInstance, enable, data);
+}
+
+#endif
diff --git a/modules/openthread/platform/platform-zephyr.h b/modules/openthread/platform/platform-zephyr.h
index 94fd04d70579ac..ca25fedf2b1899 100644
--- a/modules/openthread/platform/platform-zephyr.h
+++ b/modules/openthread/platform/platform-zephyr.h
@@ -77,13 +77,20 @@ uint16_t platformRadioChannelGet(otInstance *aInstance);
 otError platformRadioTransmitCarrier(otInstance *aInstance, bool aEnable);
 #endif /* CONFIG_IEEE802154_CARRIER_FUNCTIONS */
 
+#if defined(CONFIG_IEEE802154_CARRIER_FUNCTIONS)
+/**
+ * Start/stop modulated carrier wave transmission.
+ */
+otError platformRadioTransmitModulatedCarrier(otInstance *aInstance, bool aEnable,
+					      const uint8_t *aData);
+#endif
+
 /**
  * This function initializes the random number service used by OpenThread.
  *
  */
 void platformRandomInit(void);
 
-
 /**
  *  Initialize platform Shell driver.
  */
diff --git a/modules/openthread/platform/radio.c b/modules/openthread/platform/radio.c
index 008dab009930f5..0aaa237ee14d93 100644
--- a/modules/openthread/platform/radio.c
+++ b/modules/openthread/platform/radio.c
@@ -11,6 +11,7 @@
  *
  */
 
+#include <openthread/error.h>
 #define LOG_MODULE_NAME net_otPlat_radio
 
 #include <zephyr/logging/log.h>
@@ -846,6 +847,34 @@ otError platformRadioTransmitCarrier(otInstance *aInstance, bool aEnable)
 
 	return OT_ERROR_NONE;
 }
+
+otError platformRadioTransmitModulatedCarrier(otInstance *aInstance, bool aEnable,
+					      const uint8_t *aData)
+{
+	if (radio_api->modulated_carrier == NULL) {
+		return OT_ERROR_NOT_IMPLEMENTED;
+	}
+
+	if (aEnable && sState == OT_RADIO_STATE_RECEIVE) {
+		if (aData == NULL) {
+			return OT_ERROR_INVALID_ARGS;
+		}
+
+		radio_api->set_txpower(radio_dev, get_transmit_power_for_channel(channel));
+
+		if (radio_api->modulated_carrier(radio_dev, aData) != 0) {
+			return OT_ERROR_FAILED;
+		}
+		sState = OT_RADIO_STATE_TRANSMIT;
+	} else if ((!aEnable) && sState == OT_RADIO_STATE_TRANSMIT) {
+		return otPlatRadioReceive(aInstance, channel);
+	} else {
+		return OT_ERROR_INVALID_STATE;
+	}
+
+	return OT_ERROR_NONE;
+}
+
 #endif /* CONFIG_IEEE802154_CARRIER_FUNCTIONS */
 
 otRadioState otPlatRadioGetState(otInstance *aInstance)