diff --git a/mobly/controllers/android_device_lib/fastboot.py b/mobly/controllers/android_device_lib/fastboot.py
index 754a039..1ef4969 100644
--- a/mobly/controllers/android_device_lib/fastboot.py
+++ b/mobly/controllers/android_device_lib/fastboot.py
@@ -12,8 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import logging
 from subprocess import Popen, PIPE
 
+from mobly import utils
+
 
 def exe_cmd(*cmds):
   """Executes commands in a new shell. Directing stderr to PIPE.
@@ -33,6 +36,9 @@
   cmd = ' '.join(cmds)
   proc = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True)
   (out, err) = proc.communicate()
+  ret = proc.returncode
+  logging.debug('cmd: %s, stdout: %s, stderr: %s, ret: %s',
+                utils.cli_cmd_to_string(cmds), out, err, ret)
   if not err:
     return out
   return err
diff --git a/tests/mobly/controllers/android_device_lib/fastboot_test.py b/tests/mobly/controllers/android_device_lib/fastboot_test.py
new file mode 100644
index 0000000..6e59dea
--- /dev/null
+++ b/tests/mobly/controllers/android_device_lib/fastboot_test.py
@@ -0,0 +1,43 @@
+# Copyright 2022 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+from unittest import mock
+
+from mobly.controllers.android_device_lib import fastboot
+
+
+class FastbootTest(unittest.TestCase):
+  """Unit tests for mobly.controllers.android_device_lib.adb."""
+
+  @mock.patch('mobly.controllers.android_device_lib.fastboot.Popen')
+  @mock.patch('logging.debug')
+  def test_fastboot_commands_and_results_are_logged_to_debug_log(
+      self, mock_debug_logger, mock_popen):
+    expected_stdout = 'stdout'
+    expected_stderr = b'stderr'
+    mock_popen.return_value.communicate = mock.Mock(
+        return_value=(expected_stdout, expected_stderr))
+    mock_popen.return_value.returncode = 123
+
+    fastboot.FastbootProxy().fake_command('extra', 'flags')
+
+    mock_debug_logger.assert_called_with(
+        'cmd: %s, stdout: %s, stderr: %s, ret: %s',
+        '\'fastboot fake-command extra flags\'', expected_stdout,
+        expected_stderr, 123)
+
+
+if __name__ == '__main__':
+  unittest.main()