diff --git a/vllm/multimodal/processing/processor.py b/vllm/multimodal/processing/processor.py
index dfce4dab2..fe697c5ce 100644
--- a/vllm/multimodal/processing/processor.py
+++ b/vllm/multimodal/processing/processor.py
@@ -988,16 +988,15 @@ class BaseMultiModalProcessor(ABC, Generic[_I]):
         self.dummy_inputs = dummy_inputs
         self.cache = cache
 
+        # TODO: Remove in v0.18
         if hasattr(self, "_get_data_parser"):
-            logger.warning_once(
-                "BaseMultiModalProcessor._get_data_parser is deprecated "
-                "and will be removed in v0.16."
-                "You should override `info.build_data_parser` instead."
+            raise ValueError(
+                "BaseMultiModalProcessor._get_data_parser has been "
+                "moved to `BaseProcessingInfo.build_data_parser` in v0.16. "
+                "You should override `BaseProcessingInfo.build_data_parser` instead."
             )
 
-            self.data_parser = self._get_data_parser()  # type: ignore
-        else:
-            self.data_parser = self.info.get_data_parser()
+        self.data_parser = self.info.get_data_parser()
 
     @property
     @deprecated("Will be removed in v0.17. Use `info.supported_mm_limits` instead.")