diff --git a/clients/client-auto-scaling/protocols/Aws_query.ts b/clients/client-auto-scaling/protocols/Aws_query.ts
index e7b6ffaa6e50..7e8a49d9fd2f 100644
--- a/clients/client-auto-scaling/protocols/Aws_query.ts
+++ b/clients/client-auto-scaling/protocols/Aws_query.ts
@@ -10008,7 +10008,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-cloudformation/protocols/Aws_query.ts b/clients/client-cloudformation/protocols/Aws_query.ts
index 4bcbe8b76803..415813a7e32c 100644
--- a/clients/client-cloudformation/protocols/Aws_query.ts
+++ b/clients/client-cloudformation/protocols/Aws_query.ts
@@ -11149,7 +11149,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-cloudfront/protocols/Aws_restXml.ts b/clients/client-cloudfront/protocols/Aws_restXml.ts
index 37479a2ff0cd..af7bd556b6a1 100644
--- a/clients/client-cloudfront/protocols/Aws_restXml.ts
+++ b/clients/client-cloudfront/protocols/Aws_restXml.ts
@@ -19025,7 +19025,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-cloudsearch/protocols/Aws_query.ts b/clients/client-cloudsearch/protocols/Aws_query.ts
index 88dea54b31fe..14b43a0d6b69 100644
--- a/clients/client-cloudsearch/protocols/Aws_query.ts
+++ b/clients/client-cloudsearch/protocols/Aws_query.ts
@@ -4921,7 +4921,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-cloudwatch/protocols/Aws_query.ts b/clients/client-cloudwatch/protocols/Aws_query.ts
index 00f2c2728a91..f63f89c32507 100644
--- a/clients/client-cloudwatch/protocols/Aws_query.ts
+++ b/clients/client-cloudwatch/protocols/Aws_query.ts
@@ -6370,7 +6370,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-docdb/protocols/Aws_query.ts b/clients/client-docdb/protocols/Aws_query.ts
index 494cf98a708e..c4712b13cfb3 100644
--- a/clients/client-docdb/protocols/Aws_query.ts
+++ b/clients/client-docdb/protocols/Aws_query.ts
@@ -10727,7 +10727,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-ec2/protocols/Aws_ec2.ts b/clients/client-ec2/protocols/Aws_ec2.ts
index 20dbdcafdb65..9f6f7afefee6 100644
--- a/clients/client-ec2/protocols/Aws_ec2.ts
+++ b/clients/client-ec2/protocols/Aws_ec2.ts
@@ -74754,7 +74754,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-elastic-beanstalk/protocols/Aws_query.ts b/clients/client-elastic-beanstalk/protocols/Aws_query.ts
index b320819a40e2..83af9cc81068 100644
--- a/clients/client-elastic-beanstalk/protocols/Aws_query.ts
+++ b/clients/client-elastic-beanstalk/protocols/Aws_query.ts
@@ -8205,7 +8205,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-elastic-load-balancing-v2/protocols/Aws_query.ts b/clients/client-elastic-load-balancing-v2/protocols/Aws_query.ts
index 2bd4a8af5550..afbb524e7f5a 100644
--- a/clients/client-elastic-load-balancing-v2/protocols/Aws_query.ts
+++ b/clients/client-elastic-load-balancing-v2/protocols/Aws_query.ts
@@ -7863,7 +7863,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-elastic-load-balancing/protocols/Aws_query.ts b/clients/client-elastic-load-balancing/protocols/Aws_query.ts
index 54b7fc0c5c0d..8979ed04ef13 100644
--- a/clients/client-elastic-load-balancing/protocols/Aws_query.ts
+++ b/clients/client-elastic-load-balancing/protocols/Aws_query.ts
@@ -5410,7 +5410,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-elasticache/protocols/Aws_query.ts b/clients/client-elasticache/protocols/Aws_query.ts
index a465d9e8bb06..9981edc6705c 100644
--- a/clients/client-elasticache/protocols/Aws_query.ts
+++ b/clients/client-elasticache/protocols/Aws_query.ts
@@ -15016,7 +15016,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-iam/protocols/Aws_query.ts b/clients/client-iam/protocols/Aws_query.ts
index 7208998f167c..0a573907d7dc 100644
--- a/clients/client-iam/protocols/Aws_query.ts
+++ b/clients/client-iam/protocols/Aws_query.ts
@@ -21436,7 +21436,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-neptune/protocols/Aws_query.ts b/clients/client-neptune/protocols/Aws_query.ts
index 84b8276d9fba..20feaa21dec1 100644
--- a/clients/client-neptune/protocols/Aws_query.ts
+++ b/clients/client-neptune/protocols/Aws_query.ts
@@ -13195,7 +13195,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-rds/protocols/Aws_query.ts b/clients/client-rds/protocols/Aws_query.ts
index 17bff2ce056d..43bebc89ad1e 100644
--- a/clients/client-rds/protocols/Aws_query.ts
+++ b/clients/client-rds/protocols/Aws_query.ts
@@ -28153,7 +28153,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-redshift/protocols/Aws_query.ts b/clients/client-redshift/protocols/Aws_query.ts
index 8e772559ce5a..604fd90c2a7d 100644
--- a/clients/client-redshift/protocols/Aws_query.ts
+++ b/clients/client-redshift/protocols/Aws_query.ts
@@ -22294,7 +22294,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-route-53/protocols/Aws_restXml.ts b/clients/client-route-53/protocols/Aws_restXml.ts
index 16afda7f9aa7..2847e2e5cfee 100644
--- a/clients/client-route-53/protocols/Aws_restXml.ts
+++ b/clients/client-route-53/protocols/Aws_restXml.ts
@@ -10422,7 +10422,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-s3-control/protocols/Aws_restXml.ts b/clients/client-s3-control/protocols/Aws_restXml.ts
index 6690fb4352b2..a6a047ca88f0 100644
--- a/clients/client-s3-control/protocols/Aws_restXml.ts
+++ b/clients/client-s3-control/protocols/Aws_restXml.ts
@@ -8182,7 +8182,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-s3/protocols/Aws_restXml.ts b/clients/client-s3/protocols/Aws_restXml.ts
index fc6681828c4b..90e875b35e25 100644
--- a/clients/client-s3/protocols/Aws_restXml.ts
+++ b/clients/client-s3/protocols/Aws_restXml.ts
@@ -14724,7 +14724,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-ses/protocols/Aws_query.ts b/clients/client-ses/protocols/Aws_query.ts
index 2150a7055bfd..708d7729372f 100644
--- a/clients/client-ses/protocols/Aws_query.ts
+++ b/clients/client-ses/protocols/Aws_query.ts
@@ -10320,7 +10320,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-sns/protocols/Aws_query.ts b/clients/client-sns/protocols/Aws_query.ts
index f3abf346f942..19a662c5062a 100644
--- a/clients/client-sns/protocols/Aws_query.ts
+++ b/clients/client-sns/protocols/Aws_query.ts
@@ -6347,7 +6347,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-sqs/protocols/Aws_query.ts b/clients/client-sqs/protocols/Aws_query.ts
index f05e637b8e59..59a687088bfd 100644
--- a/clients/client-sqs/protocols/Aws_query.ts
+++ b/clients/client-sqs/protocols/Aws_query.ts
@@ -3141,7 +3141,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/clients/client-sts/protocols/Aws_query.ts b/clients/client-sts/protocols/Aws_query.ts
index 1a3362921712..bd81daea0ab2 100644
--- a/clients/client-sts/protocols/Aws_query.ts
+++ b/clients/client-sts/protocols/Aws_query.ts
@@ -1480,7 +1480,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java
index 444c50367669..3cb807457a09 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java
@@ -135,7 +135,8 @@ static void generateXmlParseBody(GenerationContext context) {
                     writer.openBlock("if (encoded.length) {", "}", () -> {
                         writer.write("const parsedObj = xmlParse(encoded, { attributeNamePrefix: '', "
                                 + "ignoreAttributes: false, parseNodeValue: false, trimValues: false, "
-                                + "tagValueProcessor: (val, tagName) => val.trim() === '' ? '': decodeHTML(val) });");
+                                + "tagValueProcessor: (val) => (val.trim() === '' && val.includes('\\n'))"
+                                + " ? '': decodeHTML(val) });");
                         writer.write("const textNodeName = '#text';");
                         writer.write("const key = Object.keys(parsedObj)[0];");
                         writer.write("const parsedObjToReturn = parsedObj[key];");
@@ -293,10 +294,6 @@ private static boolean filterProtocolTests(
         if (testCase.getId().equals("QueryCustomizedError")) {
             return true;
         }
-        // TODO: follow-up with smithy on whether whitespace strings should be trimmed.
-        if (testCase.getId().equals("SimpleScalarPropertiesPureWhiteSpace")) {
-            return true;
-        }
         return false;
     }
 }
diff --git a/protocol_tests/aws-ec2/protocols/Aws_ec2.ts b/protocol_tests/aws-ec2/protocols/Aws_ec2.ts
index 130270f4482b..86c018d18cc4 100644
--- a/protocol_tests/aws-ec2/protocols/Aws_ec2.ts
+++ b/protocol_tests/aws-ec2/protocols/Aws_ec2.ts
@@ -2172,7 +2172,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/protocol_tests/aws-query/protocols/Aws_query.ts b/protocol_tests/aws-query/protocols/Aws_query.ts
index fe465866fa64..20535bbf2cf1 100644
--- a/protocol_tests/aws-query/protocols/Aws_query.ts
+++ b/protocol_tests/aws-query/protocols/Aws_query.ts
@@ -3002,7 +3002,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/protocol_tests/aws-restxml/protocols/Aws_restXml.ts b/protocol_tests/aws-restxml/protocols/Aws_restXml.ts
index 21c15b3abd9d..b90b6120cb7e 100644
--- a/protocol_tests/aws-restxml/protocols/Aws_restXml.ts
+++ b/protocol_tests/aws-restxml/protocols/Aws_restXml.ts
@@ -6173,7 +6173,7 @@ const parseBody = (streamBody: any, context: __SerdeContext): any =>
         ignoreAttributes: false,
         parseNodeValue: false,
         trimValues: false,
-        tagValueProcessor: (val, tagName) => (val.trim() === "" ? "" : decodeHTML(val)),
+        tagValueProcessor: (val) => (val.trim() === "" && val.includes("\n") ? "" : decodeHTML(val)),
       });
       const textNodeName = "#text";
       const key = Object.keys(parsedObj)[0];
diff --git a/protocol_tests/aws-restxml/tests/functional/restxml.spec.ts b/protocol_tests/aws-restxml/tests/functional/restxml.spec.ts
index b5befa7e80bf..6ac2e91586e4 100644
--- a/protocol_tests/aws-restxml/tests/functional/restxml.spec.ts
+++ b/protocol_tests/aws-restxml/tests/functional/restxml.spec.ts
@@ -3780,7 +3780,7 @@ it("SimpleScalarPropertiesWithWhiteSpace:Request", async () => {
 /**
  * Serializes string containing exclusively whitespace
  */
-it.skip("SimpleScalarPropertiesPureWhiteSpace:Request", async () => {
+it("SimpleScalarPropertiesPureWhiteSpace:Request", async () => {
   const client = new RestXmlProtocolClient({
     ...clientParams,
     requestHandler: new RequestSerializationTestHandler(),
@@ -4203,7 +4203,7 @@ it("SimpleScalarPropertiesWithWhiteSpace:Response", async () => {
 /**
  * Serializes string containing white space
  */
-it.skip("SimpleScalarPropertiesPureWhiteSpace:Response", async () => {
+it("SimpleScalarPropertiesPureWhiteSpace:Response", async () => {
   const client = new RestXmlProtocolClient({
     ...clientParams,
     requestHandler: new ResponseDeserializationTestHandler(