diff --git a/airbyte_cdk/sources/streams/http/error_handlers/default_error_mapping.py b/airbyte_cdk/sources/streams/http/error_handlers/default_error_mapping.py
index 45716768fd..464f7945b8 100644
--- a/airbyte_cdk/sources/streams/http/error_handlers/default_error_mapping.py
+++ b/airbyte_cdk/sources/streams/http/error_handlers/default_error_mapping.py
@@ -30,7 +30,7 @@
     ),
     400: ErrorResolution(
         response_action=ResponseAction.FAIL,
-        failure_type=FailureType.system_error,
+        failure_type=FailureType.config_error,
         error_message="HTTP Status Code: 400. Error: Bad request. Please check your request parameters.",
     ),
     401: ErrorResolution(
diff --git a/unit_tests/sources/declarative/requesters/error_handlers/test_default_error_handler.py b/unit_tests/sources/declarative/requesters/error_handlers/test_default_error_handler.py
index 526e5760fc..2b202e1363 100644
--- a/unit_tests/sources/declarative/requesters/error_handlers/test_default_error_handler.py
+++ b/unit_tests/sources/declarative/requesters/error_handlers/test_default_error_handler.py
@@ -91,7 +91,7 @@ def test_default_error_handler_with_default_response_filter(
                 parameters={},
             ),
             ResponseAction.RETRY,
-            FailureType.system_error,
+            FailureType.config_error,
             "HTTP Status Code: 400. Error: Bad request. Please check your request parameters.",
         ),
         (
diff --git a/unit_tests/sources/mock_server_tests/test_resumable_full_refresh.py b/unit_tests/sources/mock_server_tests/test_resumable_full_refresh.py
index 04e232083e..a2a88923c2 100644
--- a/unit_tests/sources/mock_server_tests/test_resumable_full_refresh.py
+++ b/unit_tests/sources/mock_server_tests/test_resumable_full_refresh.py
@@ -370,6 +370,6 @@ def test_resumable_full_refresh_failure(self, http_mocker):
             page=2
         )
 
-        assert actual_messages.errors[0].trace.error.failure_type == FailureType.system_error
+        assert actual_messages.errors[0].trace.error.failure_type == FailureType.config_error
         assert actual_messages.errors[0].trace.error.stream_descriptor.name == "justice_songs"
         assert "Bad request" in actual_messages.errors[0].trace.error.message
diff --git a/unit_tests/sources/streams/http/test_http_client.py b/unit_tests/sources/streams/http/test_http_client.py
index 48d396cb63..87a12d0014 100644
--- a/unit_tests/sources/streams/http/test_http_client.py
+++ b/unit_tests/sources/streams/http/test_http_client.py
@@ -785,13 +785,13 @@ def test_send_request_respects_environment_variables():
 @pytest.mark.parametrize(
     "response_code, expected_failure_type, error_message, exception_class",
     [
-        (400, FailureType.system_error, "test error message", UserDefinedBackoffException),
+        (400, FailureType.config_error, "test error message", UserDefinedBackoffException),
         (401, FailureType.config_error, "test error message", UserDefinedBackoffException),
         (403, FailureType.transient_error, "test error message", UserDefinedBackoffException),
-        (400, FailureType.system_error, "test error message", DefaultBackoffException),
+        (400, FailureType.config_error, "test error message", DefaultBackoffException),
         (401, FailureType.config_error, "test error message", DefaultBackoffException),
         (403, FailureType.transient_error, "test error message", DefaultBackoffException),
-        (400, FailureType.system_error, "test error message", RateLimitBackoffException),
+        (400, FailureType.config_error, "test error message", RateLimitBackoffException),
         (401, FailureType.config_error, "test error message", RateLimitBackoffException),
         (403, FailureType.transient_error, "test error message", RateLimitBackoffException),
     ],