diff --git a/pytorch_lightning/trainer/trainer.py b/pytorch_lightning/trainer/trainer.py
index 4e19f16b29..ac01227fd0 100644
--- a/pytorch_lightning/trainer/trainer.py
+++ b/pytorch_lightning/trainer/trainer.py
@@ -459,7 +459,7 @@ class Trainer(
         self.logger_connector = LoggerConnector(self, log_gpu_memory)
         self._callback_connector = CallbackConnector(self)
         self.checkpoint_connector = CheckpointConnector(self, resume_from_checkpoint)
-        self.signal_connector = SignalConnector(self)
+        self._signal_connector = SignalConnector(self)
         self.tuner = Tuner(self)
 
         min_steps, max_steps, min_epochs, max_epochs, max_time = _parse_loop_limits(
@@ -1242,7 +1242,7 @@ class Trainer(
         self._data_connector.teardown()
         self._active_loop.teardown()
         self.logger_connector.teardown()
-        self.signal_connector.teardown()
+        self._signal_connector.teardown()
 
     def run_stage(self) -> None:
         rank_zero_deprecation(
@@ -1267,7 +1267,7 @@ class Trainer(
         self.strategy.barrier("setup_training")
 
         # register signals
-        self.signal_connector.register_signal_handlers()
+        self._signal_connector.register_signal_handlers()
 
         # --------------------------
         # Pre-train
diff --git a/tests/trainer/connectors/test_signal_connector.py b/tests/trainer/connectors/test_signal_connector.py
index 3b4ccf5589..5988809af4 100644
--- a/tests/trainer/connectors/test_signal_connector.py
+++ b/tests/trainer/connectors/test_signal_connector.py
@@ -100,7 +100,7 @@ def test_auto_requeue_flag(auto_requeue):
 
 def _registering_signals():
     trainer = Trainer()
-    trainer.signal_connector.register_signal_handlers()
+    trainer._signal_connector.register_signal_handlers()
 
 
 @RunIf(skip_windows=True)