diff --git a/src/vmcu/services/communications/FDCAN.py b/src/vmcu/services/communications/FDCAN.py
index 2c6a4cb..8802a51 100644
--- a/src/vmcu/services/communications/FDCAN.py
+++ b/src/vmcu/services/communications/FDCAN.py
@@ -92,18 +92,18 @@ def read(self )-> "Packet":
         
         pack=Packet(aux_identifier, aux_dlc)
         for i in range(8,aux_dlc+8):
-            pack.rx_data += aux_data[i].to_bytes(1, 'big')
+            pack.rx_data[i-8] += aux_data[i].to_bytes(1, 'big')
         
         return pack
             
             
 class Packet:
         def __init__(self):
-            self.rx_data = b""
+            self.rx_data = list[bytes]()
             self.identifier: int = None
             self.data_length: int = None
         def __init__(self, identifier: int, data_length: "FDCAN.DLC"):
-            self.rx_data = b""
+            self.rx_data = list[bytes](self.dlc_to_len[data_length])
             self.identifier: int = identifier
             self.data_length: int = data_length