diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0700Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0700Test.cs
index 3d6bfcf..6de10d8 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0700Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0700Test.cs
@@ -666,6 +666,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(50, body.JT808_CarDVR_Up_0x15_SpeedStatusLogs[0].JT808_CarDVR_Up_0x15_SpeedPerSeconds[0].RecordSpeed);
             Assert.Equal(40, body.JT808_CarDVR_Up_0x15_SpeedStatusLogs[0].JT808_CarDVR_Up_0x15_SpeedPerSeconds[0].ReferenceSpeed);
         }
+
         [Fact]
         public void Test_Serialize_0x82()
         {
@@ -689,5 +690,35 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(1, value.ReplyMsgNum);
             var body = value.JT808CarDVRUpPackage.Bodies as JT808_CarDVR_Up_0x82;
         }
+
+        [Fact]
+        public void Test_Serialize_Error()
+        {
+            JT808_0x0700 value = new JT808_0x0700();
+            value.CommandId = 0xFA;
+            value.ReplyMsgNum = 1;
+            value.JT808CarDVRUpPackage = new JT808CarDVRUpPackage
+            {
+                CommandId = 0xFA
+            };
+            var hex = JT808Serializer.Serialize(value).ToHexString();
+            Assert.Equal("0001FA557AFA00D5", hex);
+        }
+
+        [Fact]
+        public void Test_Deserilize_Error()
+        {
+            byte[] bytes = "0001FA557AFA00D5".ToHexBytes();
+            JT808_0x0700 value = JT808Serializer.Deserialize<JT808_0x0700>(bytes);
+            Assert.Equal(1, value.ReplyMsgNum);
+            Assert.True(value.JT808CarDVRUpPackage.ErrorFlag);
+        }
+
+        [Fact]
+        public void Test_Json_Error()
+        {
+            byte[] bytes = "0001FA557AFA00D5".ToHexBytes();
+            string json = JT808Serializer.Analyze<JT808_0x0700>(bytes);
+        }
     }
 }
diff --git a/src/JT808.Protocol/JT808.Protocol.csproj b/src/JT808.Protocol/JT808.Protocol.csproj
index fcc3fa1..8d00343 100644
--- a/src/JT808.Protocol/JT808.Protocol.csproj
+++ b/src/JT808.Protocol/JT808.Protocol.csproj
@@ -15,7 +15,7 @@
     <license>https://github.com/SmallChi/JT808/blob/master/LICENSE</license>
     <DocumentationFile>JT808.Protocol.xml</DocumentationFile>
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
-    <Version>2.3.9</Version>
+    <Version>2.4.0</Version>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <AnalysisLevel>latest</AnalysisLevel>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
diff --git a/src/JT808.Protocol/JT808.Protocol.xml b/src/JT808.Protocol/JT808.Protocol.xml
index f014a1a..0a398ef 100644
--- a/src/JT808.Protocol/JT808.Protocol.xml
+++ b/src/JT808.Protocol/JT808.Protocol.xml
@@ -4791,6 +4791,12 @@
             命令字
             </summary>
         </member>
+        <member name="P:JT808.Protocol.JT808CarDVRUpPackage.ErrorFlag">
+            <summary>
+            错误标志
+            CommandId == 0xFA || CommandId == 0xFB
+            </summary>
+        </member>
         <member name="P:JT808.Protocol.JT808CarDVRUpPackage.DataLength">
             <summary>
             数据块长度
diff --git a/src/JT808.Protocol/JT808CarDVRUpPackage.cs b/src/JT808.Protocol/JT808CarDVRUpPackage.cs
index 05e4091..44a2184 100644
--- a/src/JT808.Protocol/JT808CarDVRUpPackage.cs
+++ b/src/JT808.Protocol/JT808CarDVRUpPackage.cs
@@ -29,6 +29,11 @@ namespace JT808.Protocol
         /// </summary>
         public byte CommandId { get; set; }
         /// <summary>
+        /// 错误标志
+        /// CommandId == 0xFA || CommandId == 0xFB
+        /// </summary>
+        public bool ErrorFlag { get; set; }
+        /// <summary>
         /// 数据块长度
         /// </summary>
         public ushort DataLength { get; set; }
@@ -58,9 +63,18 @@ namespace JT808.Protocol
             value.Begin = reader.ReadUInt16();
             writer.WriteNumber($"[{value.Begin.ReadNumber()}]起始字头", value.Begin);
             value.CommandId = reader.ReadByte();
-            writer.WriteString($"[{value.Begin.ReadNumber()}]命令字", ((JT808CarDVRCommandID)value.CommandId).ToString());
-            value.DataLength = reader.ReadUInt16();
-            writer.WriteNumber($"[{value.DataLength.ReadNumber()}]数据块长度", value.DataLength);
+            //出错标志位
+            value.ErrorFlag = value.CommandId == 0xFA || value.CommandId == 0xFB;
+            if (!value.ErrorFlag)
+            {
+                writer.WriteString($"[{value.CommandId.ReadNumber()}]命令字", ((JT808CarDVRCommandID)value.CommandId).ToString());
+                value.DataLength = reader.ReadUInt16();
+                writer.WriteNumber($"[{value.DataLength.ReadNumber()}]数据块长度", value.DataLength);
+            }
+            else
+            {
+                writer.WriteString($"[{value.CommandId.ReadNumber()}]出错标志字", value.CommandId.ToString());
+            }
             value.KeepFields = reader.ReadByte();
             writer.WriteNumber($"[{value.KeepFields.ReadNumber()}]保留字", value.KeepFields);
             if (value.DataLength > 0)
@@ -97,7 +111,12 @@ namespace JT808.Protocol
             int currentPosition = reader.ReaderCount;
             value.Begin = reader.ReadUInt16();
             value.CommandId = reader.ReadByte();
-            value.DataLength = reader.ReadUInt16();
+            //出错标志位
+            value.ErrorFlag = value.CommandId == 0xFA || value.CommandId == 0xFB;
+            if (!value.ErrorFlag)
+            {
+                value.DataLength = reader.ReadUInt16();
+            }
             value.KeepFields = reader.ReadByte();
             if (value.DataLength > 0)
             {
@@ -128,17 +147,25 @@ namespace JT808.Protocol
             var currentPosition = writer.GetCurrentPosition();
             writer.WriteUInt16(value.Begin);
             writer.WriteByte(value.CommandId);
-            writer.Skip(2, out var datalengthPosition);
+            var isError = value.CommandId == 0xFA || value.CommandId == 0xFB;
+            int datalengthPosition=0;
+            if (!isError)
+            {
+                writer.Skip(2, out datalengthPosition);
+            }
             writer.WriteByte(value.KeepFields);
-            if (config.JT808_CarDVR_Up_Factory.Map.TryGetValue(value.CommandId, out var instance))
+            if (datalengthPosition > 0)
             {
-                if (!value.Bodies.SkipSerialization)
+                if (config.JT808_CarDVR_Up_Factory.Map.TryGetValue(value.CommandId, out var instance))
                 {
-                    //4.2.处理消息体
-                    JT808MessagePackFormatterResolverExtensions.JT808DynamicSerialize(instance, ref writer, value.Bodies, config);
+                    if (!value.Bodies.SkipSerialization)
+                    {
+                        //4.2.处理消息体
+                        JT808MessagePackFormatterResolverExtensions.JT808DynamicSerialize(instance, ref writer, value.Bodies, config);
+                    }
                 }
+                writer.WriteUInt16Return((ushort)(writer.GetCurrentPosition() - 2 - 1 - datalengthPosition), datalengthPosition);//此处-2：减去数据长度字段2位，-1：减去保留字长度
             }
-            writer.WriteUInt16Return((ushort)(writer.GetCurrentPosition() -2-1- datalengthPosition), datalengthPosition);//此处-2：减去数据长度字段2位，-1：减去保留字长度
             writer.WriteCarDVRCheckCode(currentPosition);
         }
     }