diff --git a/pyren/pyren.py b/pyren/pyren.py
index a48f7f0..2089829 100755
--- a/pyren/pyren.py
+++ b/pyren/pyren.py
@@ -262,7 +262,12 @@ def main():
 
   if mod_globals.opt_demo and len(mod_globals.opt_ecuid)>0:
     # demo mode with predefined ecu list
-    se.read_Uces_file( all = True )    
+    if 'tcom' in mod_globals.opt_ecuid.lower() or len(mod_globals.opt_ecuid)<4:
+        tcomid = ''.join([i for i in mod_globals.opt_ecuid if i.isdigit()])
+        se.load_model_ECUs('Vehicles/TCOM_'+tcomid+'.xml')
+        mod_globals.opt_ecuid = ','.join(sorted(se.allecus.keys()))
+    else:
+        se.read_Uces_file( all = True )
     se.detectedEcus = []
     for i in mod_globals.opt_ecuid.split(','):
       if  i in se.allecus.keys():