diff --git a/lib-bms-protocol/src/lib.rs b/lib-bms-protocol/src/lib.rs
index 006b1dd..8e13811 100644
--- a/lib-bms-protocol/src/lib.rs
+++ b/lib-bms-protocol/src/lib.rs
@@ -29,6 +29,8 @@ pub trait BmsWriteable {
 pub enum BmsProtocolError {
     #[error("i2c communication failed")]
     I2cCommunicationError,
+    #[error("checksum error in received data")]
+    ChecksumError,
 }
 
 impl<E> From<E> for BmsProtocolError
@@ -41,8 +43,11 @@ where
 }
 
 impl From<crate::types::U26Error> for BmsProtocolError {
-    fn from(_error: crate::types::U26Error) -> Self {
-        Self::I2cCommunicationError
+    fn from(error: crate::types::U26Error) -> Self {
+        match error {
+            crate::types::U26Error::ChecksumError => Self::ChecksumError,
+            _ => Self::I2cCommunicationError,
+        }
     }
 }