diff --git a/conman/connection_manager.py b/conman/connection_manager.py
index abfcb36..eaaf7cf 100755
--- a/conman/connection_manager.py
+++ b/conman/connection_manager.py
@@ -147,7 +147,7 @@
 
     try:
       subprocess.check_output(self.WIFI_STOPCLIENT + ['-b', self.band],
-                            stderr=subprocess.STDOUT)
+                              stderr=subprocess.STDOUT)
       self.client_up = False
       logging.debug('Stopped wifi client on %s GHz', self.band)
     except subprocess.CalledProcessError as e:
@@ -483,15 +483,16 @@
         match = re.match(self.COMMAND_FILE_REGEXP, filename)
         if match:
           band = match.group('band')
-          wifi = next(w for w in self.wifi if band in w.bands)
-          self._update_wlan_configuration(
-              self.WLANConfiguration(band, wifi, contents))
+          wifi = self.wifi_for_band(band)
+          if wifi:
+            self._update_wlan_configuration(
+                self.WLANConfiguration(band, wifi, contents))
       elif filename.startswith(self.ACCESS_POINT_FILE_PREFIX):
         match = re.match(self.ACCESS_POINT_FILE_REGEXP, filename)
         if match:
           band = match.group('band')
-          wifi = next(w for w in self.wifi if band in w.bands)
-          if band in self._wlan_configuration:
+          wifi = self.wifi_for_band(band)
+          if wifi and band in self._wlan_configuration:
             self._wlan_configuration[band].access_point = True
           logging.debug('AP enabled for %s GHz', band)
 
@@ -527,6 +528,15 @@
       if ifc.name == interface_name:
         return ifc
 
+  def wifi_for_band(self, band):
+    for wifi in self.wifi:
+      if band in wifi.bands:
+        return wifi
+
+    logging.error('No wifi interface for %s GHz.  wlan interfaces:\n%s',
+                  band, '\n'.join('%s: %r' %
+                                  (w.name, w.bands) for w in self.wifi))
+
   def ifplugd_action(self, interface_name, up):
     subprocess.call(self.IFPLUGD_ACTION + [interface_name,
                                            'up' if up else 'down'])
diff --git a/conman/connection_manager_test.py b/conman/connection_manager_test.py
index 19264f7..4ebd48b 100755
--- a/conman/connection_manager_test.py
+++ b/conman/connection_manager_test.py
@@ -76,6 +76,21 @@
 Client BSSID: f4:f5:e8:81:1b:a1
 """
 
+# See b/27328894.
+WIFI_SHOW_OUTPUT_ONE_RADIO_NO_5GHZ = """Band: 2.4
+RegDomain: 00
+Interface: wlan0  # 2.4 GHz ap
+BSSID: 00:50:43:02:fe:01
+AutoChannel: False
+Station List for band: 2.4
+
+Client Interface: wcli0  # 2.4 GHz client
+Client BSSID: 00:50:43:02:fe:02
+
+Band: 5
+RegDomain: 00
+"""
+
 IW_SCAN_OUTPUT = """BSS 00:11:22:33:44:55(on wcli0)
   SSID: s1
   Vendor specific: OUI f4:f5:e8, data: 01
@@ -265,11 +280,6 @@
 
   # Non-overrides
 
-  def wifi_for_band(self, band):
-    for wifi in self.wifi:
-      if band in wifi.bands:
-        return wifi
-
   def access_point_up(self, band):
     if band not in self._wlan_configuration:
       return False
@@ -710,5 +720,42 @@
   wvtest.WVPASS(c.wifi_for_band('5').current_route())
 
 
+@wvtest.wvtest
+@connection_manager_test(WIFI_SHOW_OUTPUT_ONE_RADIO_NO_5GHZ)
+def connection_manager_test_one_radio_no_5ghz(c):
+  """Test ConnectionManager for the case documented in b/27328894.
+
+  conman should be able to handle the lack of 5 GHz without actually
+  crashing.  Wired connections should not be affected.
+
+  Args:
+    c:  The ConnectionManager set up by @connection_manager_test.
+  """
+  # Make sure we've correctly set up the test; that there is no 5 GHz wifi
+  # interface.
+  wvtest.WVPASSEQ(c.wifi_for_band('5'), None)
+
+  c.set_ethernet(True)
+  wvtest.WVPASS(c.acs())
+  wvtest.WVPASS(c.internet())
+
+  # Make sure this doesn't crash.
+  c.write_wlan_config('5', 'my ssid', 'my psk')
+  c.run_once()
+  c.enable_access_point('5')
+  c.run_once()
+  c.disable_access_point('5')
+  c.run_once()
+  c.delete_wlan_config('5')
+  c.run_once()
+
+  # Make sure 2.4 still works.
+  c.write_wlan_config('2.4', 'my ssid', 'my psk')
+  c.run_once()
+  wvtest.WVPASS(c.wifi_for_band('2.4').acs())
+  wvtest.WVPASS(c.wifi_for_band('2.4').internet())
+  wvtest.WVPASS(c.wifi_for_band('2.4').current_route())
+
+
 if __name__ == '__main__':
   wvtest.wvtest_main()