diff --git a/system/system_error_monitor/README.md b/system/system_error_monitor/README.md
index d1bfbdc95488d..a62d4b0f00576 100644
--- a/system/system_error_monitor/README.md
+++ b/system/system_error_monitor/README.md
@@ -108,12 +108,13 @@ endif
 
 ### Node Parameters
 
-| Name                         | Type   | Default Value | Explanation                                                                                                                                             |
-| ---------------------------- | ------ | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `ignore_missing_diagnostics` | bool   | `false`       | If this parameter is turned off, it will be ignored if required modules have not been received.                                                         |
-| `add_leaf_diagnostics`       | bool   | `true`        | Required to use children diagnostics.                                                                                                                   |
-| `diag_timeout_sec`           | double | `1.0` (sec)   | If required diagnostic is not received for a `diag_timeout_sec`, the diagnostic state become STALE state.                                               |
-| `data_ready_timeout`         | double | `30.0`        | If input topics required for system_error_monitor are not available for `data_ready_timeout` seconds, autoware_state will translate to emergency state. |
+| Name                         | Type   | Default Value | Explanation                                                                                                                                                            |
+| ---------------------------- | ------ | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `ignore_missing_diagnostics` | bool   | `false`       | If this parameter is turned off, it will be ignored if required modules have not been received.                                                                        |
+| `add_leaf_diagnostics`       | bool   | `true`        | Required to use children diagnostics.                                                                                                                                  |
+| `diag_timeout_sec`           | double | `1.0` (sec)   | If required diagnostic is not received for a `diag_timeout_sec`, the diagnostic state become STALE state.                                                              |
+| `data_ready_timeout`         | double | `30.0`        | If input topics required for system_error_monitor are not available for `data_ready_timeout` seconds, autoware_state will translate to emergency state.                |
+| `data_heartbeat_timeout`     | double | `1.0`         | If input topics required for system_error_monitor are not no longer subscribed for `data_heartbeat_timeout` seconds, autoware_state will translate to emergency state. |
 
 ### Core Parameters
 
diff --git a/system/system_error_monitor/include/system_error_monitor/system_error_monitor_core.hpp b/system/system_error_monitor/include/system_error_monitor/system_error_monitor_core.hpp
index 19c94cd21d45c..a170fa8b90742 100644
--- a/system/system_error_monitor/include/system_error_monitor/system_error_monitor_core.hpp
+++ b/system/system_error_monitor/include/system_error_monitor/system_error_monitor_core.hpp
@@ -71,6 +71,7 @@ class AutowareErrorMonitor : public rclcpp::Node
     bool ignore_missing_diagnostics;
     bool add_leaf_diagnostics;
     double data_ready_timeout;
+    double data_heartbeat_timeout;
     double diag_timeout_sec;
     double hazard_recovery_timeout;
     int emergency_hazard_level;
@@ -92,6 +93,7 @@ class AutowareErrorMonitor : public rclcpp::Node
   rclcpp::TimerBase::SharedPtr timer_;
 
   bool isDataReady();
+  bool isDataHeartbeatTimeout();
   void onTimer();
 
   // Subscriber
@@ -125,6 +127,12 @@ class AutowareErrorMonitor : public rclcpp::Node
     [[maybe_unused]] std_srvs::srv::Trigger::Request::SharedPtr request,
     std_srvs::srv::Trigger::Response::SharedPtr response);
 
+  // for Heartbeat
+  rclcpp::Time diag_array_stamp_;
+  rclcpp::Time autoware_state_stamp_;
+  rclcpp::Time current_gate_mode_stamp_;
+  rclcpp::Time control_mode_stamp_;
+
   // Algorithm
   boost::optional<DiagStamped> getLatestDiag(const std::string & diag_name) const;
   uint8_t getHazardLevel(const DiagConfig & required_module, const int diag_level) const;
diff --git a/system/system_error_monitor/launch/system_error_monitor.launch.xml b/system/system_error_monitor/launch/system_error_monitor.launch.xml
index 76d89c915a8e4..9eb805b0eb2a6 100644
--- a/system/system_error_monitor/launch/system_error_monitor.launch.xml
+++ b/system/system_error_monitor/launch/system_error_monitor.launch.xml
@@ -3,6 +3,7 @@
   <arg name="ignore_missing_diagnostics" default="false"/>
   <arg name="add_leaf_diagnostics" default="true"/>
   <arg name="data_ready_timeout" default="30.0"/>
+  <arg name="data_heartbeat_timeout" default="1.0"/>
   <arg name="diag_timeout_sec" default="1.0"/>
   <arg name="hazard_recovery_timeout" default="5.0"/>
   <arg name="use_emergency_hold" default="false"/>
@@ -45,6 +46,7 @@
     <arg name="ignore_missing_diagnostics" value="$(var ignore_missing_diagnostics)"/>
     <arg name="add_leaf_diagnostics" value="$(var add_leaf_diagnostics)"/>
     <arg name="data_ready_timeout" value="$(var data_ready_timeout)"/>
+    <arg name="data_heartbeat_timeout" value="$(var data_heartbeat_timeout)"/>
     <arg name="diag_timeout_sec" value="$(var diag_timeout_sec)"/>
     <arg name="hazard_recovery_timeout" value="$(var hazard_recovery_timeout)"/>
     <arg name="use_emergency_hold" value="$(var use_emergency_hold)"/>
diff --git a/system/system_error_monitor/launch/system_error_monitor_node.launch.xml b/system/system_error_monitor/launch/system_error_monitor_node.launch.xml
index 161f29f5ee626..6741b4f22ce48 100644
--- a/system/system_error_monitor/launch/system_error_monitor_node.launch.xml
+++ b/system/system_error_monitor/launch/system_error_monitor_node.launch.xml
@@ -3,6 +3,7 @@
   <arg name="ignore_missing_diagnostics"/>
   <arg name="add_leaf_diagnostics"/>
   <arg name="data_ready_timeout"/>
+  <arg name="data_heartbeat_timeout"/>
   <arg name="diag_timeout_sec"/>
   <arg name="hazard_recovery_timeout"/>
   <arg name="use_emergency_hold"/>
@@ -23,6 +24,7 @@
     <param name="ignore_missing_diagnostics" value="$(var ignore_missing_diagnostics)"/>
     <param name="add_leaf_diagnostics" value="$(var add_leaf_diagnostics)"/>
     <param name="data_ready_timeout" value="$(var data_ready_timeout)"/>
+    <param name="data_heartbeat_timeout" value="$(var data_heartbeat_timeout)"/>
     <param name="diag_timeout_sec" value="$(var diag_timeout_sec)"/>
     <param name="hazard_recovery_timeout" value="$(var hazard_recovery_timeout)"/>
     <param name="use_emergency_hold" value="$(var use_emergency_hold)"/>
diff --git a/system/system_error_monitor/src/system_error_monitor_core.cpp b/system/system_error_monitor/src/system_error_monitor_core.cpp
index 1a0b696bb36f4..9240563741015 100644
--- a/system/system_error_monitor/src/system_error_monitor_core.cpp
+++ b/system/system_error_monitor/src/system_error_monitor_core.cpp
@@ -234,6 +234,7 @@ AutowareErrorMonitor::AutowareErrorMonitor()
   get_parameter_or<bool>("ignore_missing_diagnostics", params_.ignore_missing_diagnostics, false);
   get_parameter_or<bool>("add_leaf_diagnostics", params_.add_leaf_diagnostics, true);
   get_parameter_or<double>("data_ready_timeout", params_.data_ready_timeout, 30.0);
+  get_parameter_or<double>("data_heartbeat_timeout", params_.data_heartbeat_timeout, 1.0);
   get_parameter_or<double>("diag_timeout_sec", params_.diag_timeout_sec, 1.0);
   get_parameter_or<double>("hazard_recovery_timeout", params_.hazard_recovery_timeout, 5.0);
   get_parameter_or<int>(
@@ -363,24 +364,36 @@ void AutowareErrorMonitor::onDiagArray(
       diag_buffer.pop_front();
     }
   }
+
+  // for Heartbeat
+  diag_array_stamp_ = this->now();
 }
 
 void AutowareErrorMonitor::onCurrentGateMode(
   const tier4_control_msgs::msg::GateMode::ConstSharedPtr msg)
 {
   current_gate_mode_ = msg;
+
+  // for Heartbeat
+  current_gate_mode_stamp_ = this->now();
 }
 
 void AutowareErrorMonitor::onAutowareState(
   const autoware_auto_system_msgs::msg::AutowareState::ConstSharedPtr msg)
 {
   autoware_state_ = msg;
+
+  // for Heartbeat
+  autoware_state_stamp_ = this->now();
 }
 
 void AutowareErrorMonitor::onControlMode(
   const autoware_auto_vehicle_msgs::msg::ControlModeReport::ConstSharedPtr msg)
 {
   control_mode_ = msg;
+
+  // for Heartbeat
+  control_mode_stamp_ = this->now();
 }
 
 bool AutowareErrorMonitor::isDataReady()
@@ -408,6 +421,37 @@ bool AutowareErrorMonitor::isDataReady()
   return true;
 }
 
+bool AutowareErrorMonitor::isDataHeartbeatTimeout()
+{
+  auto isTimeout = [this](const rclcpp::Time & last_stamp, const double threshold) {
+    const auto time_diff = this->now() - last_stamp;
+    return time_diff.seconds() > threshold;
+  };
+
+  if (isTimeout(diag_array_stamp_, params_.data_heartbeat_timeout)) {
+    RCLCPP_ERROR_THROTTLE(get_logger(), *get_clock(), 5000, "diag_array msg is timeout...");
+    return true;
+  }
+
+  if (isTimeout(current_gate_mode_stamp_, params_.data_heartbeat_timeout)) {
+    RCLCPP_ERROR_THROTTLE(get_logger(), *get_clock(), 5000, "current_gate_mode msg is timeout...");
+    return true;
+  }
+
+  if (isTimeout(autoware_state_stamp_, params_.data_heartbeat_timeout)) {
+    RCLCPP_ERROR_THROTTLE(get_logger(), *get_clock(), 5000, "autoware_state msg is timeout...");
+    return true;
+  }
+
+  if (isTimeout(control_mode_stamp_, params_.data_heartbeat_timeout)) {
+    RCLCPP_ERROR_THROTTLE(
+      get_logger(), *get_clock(), 5000, "vehicle_state_report msg is timeout...");
+    return true;
+  }
+
+  return false;
+}
+
 void AutowareErrorMonitor::onTimer()
 {
   if (!isDataReady()) {
@@ -420,6 +464,11 @@ void AutowareErrorMonitor::onTimer()
     return;
   }
 
+  if (isDataHeartbeatTimeout()) {
+    publishHazardStatus(createTimeoutHazardStatus());
+    return;
+  }
+
   current_mode_ = current_gate_mode_->data == tier4_control_msgs::msg::GateMode::AUTO
                     ? KeyName::autonomous_driving
                     : KeyName::external_control;