diff --git a/python/uds.py b/python/uds.py
index 1c2b156e..b7ea96ca 100644
--- a/python/uds.py
+++ b/python/uds.py
@@ -414,21 +414,23 @@ class IsoTpMessage():
       msg = (struct.pack("!H", 0x1000 | self.tx_len) + self.tx_dat[:self.max_len - 2]).ljust(self.max_len - 2, b"\x00")
     self._can_client.send([msg])
 
-  def recv(self, timeout=None) -> Optional[bytes]:
+  def recv(self, timeout=None) -> Tuple[Optional[bytes], bool]:
     if timeout is None:
       timeout = self.timeout
 
     start_time = time.monotonic()
+    updated = False
     try:
       while True:
         for msg in self._can_client.recv():
           self._isotp_rx_next(msg)
           start_time = time.monotonic()
+          updated = True
           if self.tx_done and self.rx_done:
-            return self.rx_dat
+            return self.rx_dat, updated
         # no timeout indicates non-blocking
         if timeout == 0:
-          return None
+          return None, updated
         if time.monotonic() - start_time > timeout:
           raise MessageTimeoutError("timeout waiting for response")
     finally:
@@ -553,7 +555,7 @@ class UdsClient():
     response_pending = False
     while True:
       timeout = self.response_pending_timeout if response_pending else self.timeout
-      resp = isotp_msg.recv(timeout)
+      resp, _ = isotp_msg.recv(timeout)
 
       if resp is None:
         continue