diff --git a/can/interfaces/iscan.py b/can/interfaces/iscan.py
index 0e51ddd12..e76d9d060 100644
--- a/can/interfaces/iscan.py
+++ b/can/interfaces/iscan.py
@@ -187,12 +187,12 @@ class IscanError(CanError):
 
     def __init__(self, function, error_code: int, arguments) -> None:
         try:
-            description = ": " + self.ERROR_CODES[self.error_code]
+            description = ": " + self.ERROR_CODES[error_code]
         except KeyError:
             description = ""
 
         super().__init__(
-            f"Function {self.function.__name__} failed{description}",
+            f"Function {function.__name__} failed{description}",
             error_code=error_code,
         )