diff --git a/src/protocol_v1/agilex_msg_parser_v1.c b/src/protocol_v1/agilex_msg_parser_v1.c
index e05c0005..c5fed8da 100644
--- a/src/protocol_v1/agilex_msg_parser_v1.c
+++ b/src/protocol_v1/agilex_msg_parser_v1.c
@@ -15,6 +15,7 @@
 #include "string.h"
 
 bool DecodeCanFrameV1(const struct can_frame *rx_frame, AgxMessage *msg) {
+  bool ret = true;
   // if checksum not correct
   if (!CalcCanFrameChecksumV1(rx_frame->can_id, (uint8_t *)rx_frame->data,
                               rx_frame->can_dlc)) {
@@ -87,10 +88,11 @@ bool DecodeCanFrameV1(const struct can_frame *rx_frame, AgxMessage *msg) {
       break;
     }
     default:
+      ret = false;
       break;
   }
 
-  return true;
+  return ret;
 }
 
 bool EncodeCanFrameV1(const AgxMessage *msg, struct can_frame *tx_frame) {
diff --git a/src/protocol_v2/agilex_msg_parser_v2.c b/src/protocol_v2/agilex_msg_parser_v2.c
index a625e290..5b561138 100644
--- a/src/protocol_v2/agilex_msg_parser_v2.c
+++ b/src/protocol_v2/agilex_msg_parser_v2.c
@@ -15,6 +15,7 @@
 #include "math.h"
 
 bool DecodeCanFrameV2(const struct can_frame *rx_frame, AgxMessage *msg) {
+  bool ret = true;
   msg->type = AgxMsgUnkonwn;
 
   switch (rx_frame->can_id) {
@@ -372,10 +373,11 @@ bool DecodeCanFrameV2(const struct can_frame *rx_frame, AgxMessage *msg) {
       break;
     }
     default:
+      ret = false;
       break;
   }
 
-  return true;
+  return ret;
 }
 
 bool EncodeCanFrameV2(const AgxMessage *msg, struct can_frame *tx_frame) {