3dprogramin
diff --git a/‎obd/protocols/protocol.py‎
Lines changed: 7 additions & 2 deletions b/‎obd/protocols/protocol.py‎
Lines changed: 7 additions & 2 deletions
@@ -127,6 +127,7 @@ class Protocol(object):
 
     # the TX_IDs of known ECUs
     TX_ID_ENGINE = None
+    TX_ID_TRANSMISSION = None
 
 
     def __init__(self, lines_0100):
@@ -253,12 +254,16 @@ def populate_ecu_map(self, messages):
 
             # if any tx_ids are exact matches to the expected values, record them
             for m in messages:
+                if m.tx_id is None:
+                    logger.debug("parse_frame failed to extract TX_ID")
+                    continue
+
                 if m.tx_id == self.TX_ID_ENGINE:
                     self.ecu_map[m.tx_id] = ECU.ENGINE
                     found_engine = True
+                elif m.tx_id == self.TX_ID_TRANSMISSION:
+                    self.ecu_map[m.tx_id] = ECU.TRANSMISSION
                 # TODO: program more of these when we figure out their constants
-                # elif m.tx_id == self.TX_ID_TRANSMISSION:
-                    # self.ecu_map[m.tx_id] = ECU.TRANSMISSION
 
             if not found_engine:
                 # last resort solution, choose ECU with the most bits set