diff --git a/modules/es/ut-coverage/es_UT.c b/modules/es/ut-coverage/es_UT.c
index f788e2704..7b70f98ac 100644
--- a/modules/es/ut-coverage/es_UT.c
+++ b/modules/es/ut-coverage/es_UT.c
@@ -3738,12 +3738,35 @@ void TestAPI(void)
     UT_Report(__FILE__, __LINE__, CFE_ES_RestartApp(AppId) == CFE_ES_ERR_RESOURCEID_NOT_VALID, "CFE_ES_RestartApp",
               "Application ID too large");
 
-    /* Test reloading an app that doesn't exist */
+    /* Test CFE_ES_ReloadApp with bad AppID argument */
+    ES_ResetUnitTest();
+    UtAssert_INT32_EQ(CFE_ES_ReloadApp(CFE_ES_APPID_UNDEFINED, "filename"), CFE_ES_ERR_RESOURCEID_NOT_VALID);
+
+    /* Test reloading a core app */
+    ES_ResetUnitTest();
+    ES_UT_SetupSingleAppId(CFE_ES_AppType_CORE, CFE_ES_AppState_RUNNING, NULL, &UtAppRecPtr, NULL);
+    AppId = CFE_ES_AppRecordGetID(UtAppRecPtr);
+    UtAssert_INT32_EQ(CFE_ES_ReloadApp(AppId, "filename"), CFE_ES_ERR_RESOURCEID_NOT_VALID);
+
+    /* Test reloading an app that is currently not running */
     ES_ResetUnitTest();
     ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_STOPPED, NULL, &UtAppRecPtr, NULL);
     AppId = CFE_ES_AppRecordGetID(UtAppRecPtr);
     UT_Report(__FILE__, __LINE__, CFE_ES_ReloadApp(AppId, "filename") == CFE_ES_ERR_RESOURCEID_NOT_VALID,
-              "CFE_ES_ReloadApp", "Bad application ID");
+              "CFE_ES_ReloadApp", "App not running");
+
+    /* Test success initiating an app reload */
+    ES_ResetUnitTest();
+    ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_RUNNING, NULL, &UtAppRecPtr, NULL);
+    AppId = CFE_ES_AppRecordGetID(UtAppRecPtr);
+    UtAssert_INT32_EQ(CFE_ES_ReloadApp(AppId, "filename"), CFE_SUCCESS);
+
+    /* Test Reload app: file doesn't exist*/
+    ES_ResetUnitTest();
+    UT_SetDefaultReturnValue(UT_KEY(OS_stat), OS_ERROR);
+    ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_RUNNING, NULL, &UtAppRecPtr, NULL);
+    AppId = CFE_ES_AppRecordGetID(UtAppRecPtr);
+    UtAssert_INT32_EQ(CFE_ES_ReloadApp(AppId, "missingfile"), CFE_ES_FILE_IO_ERR);
 
     /* Test deleting an app that doesn't exist */
     ES_ResetUnitTest();
@@ -3855,6 +3878,19 @@ void TestAPI(void)
     UT_Report(__FILE__, __LINE__, CFE_ES_GetTaskID(&TaskId) == CFE_SUCCESS, "CFE_ES_GetTaskID",
               "Get task ID by context successful");
 
+    /* Test CFE_ES_GetAppID error with null pointer parameter */
+    ES_ResetUnitTest();
+    UtAssert_INT32_EQ(CFE_ES_GetAppID(NULL), CFE_ES_BAD_ARGUMENT);
+
+    /* Test CFE_ES_GetAppIDByName error with null AppID pointer and valid name */
+    ES_ResetUnitTest();
+    UtAssert_INT32_EQ(CFE_ES_GetAppIDByName(NULL, "UT"), CFE_ES_BAD_ARGUMENT);
+
+    /* Test CFE_ES_GetAppIDByName error with valid AppID and NULL name */
+    ES_ResetUnitTest();
+    ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_RUNNING, "UT", NULL, NULL);
+    UtAssert_INT32_EQ(CFE_ES_GetAppIDByName(&AppId, NULL), CFE_ES_BAD_ARGUMENT);
+
     /* Test getting the app name with a bad app ID */
     ES_ResetUnitTest();
     AppId = CFE_ES_APPID_C(ES_UT_MakeAppIdForIndex(99999));
@@ -3987,6 +4023,13 @@ void TestAPI(void)
     CFE_ES_TaskEntryPoint();
     UtAssert_STUB_COUNT(ES_UT_TaskFunction, 1);
 
+    /* Test deleting a child task when task is not active/valid */
+    ES_ResetUnitTest();
+    ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_RUNNING, "UT", NULL, &UtTaskRecPtr);
+    TaskId               = CFE_ES_TaskRecordGetID(UtTaskRecPtr);
+    UtTaskRecPtr->TaskId = TaskId + 1; /* UtTaskRecPtr->TaskId shouldn't match the Child Task ID */
+    UtAssert_INT32_EQ(CFE_ES_DeleteChildTask(TaskId), CFE_ES_ERR_RESOURCEID_NOT_VALID);
+
     /* Test deleting a child task using a main task's ID */
     ES_ResetUnitTest();
     ES_UT_SetupSingleAppId(CFE_ES_AppType_EXTERNAL, CFE_ES_AppState_RUNNING, "UT", NULL, &UtTaskRecPtr);
@@ -4411,6 +4454,14 @@ void TestCDS()
     UT_Report(__FILE__, __LINE__, CFE_ES_CDS_CacheFlush(&CFE_ES_Global.CDSVars.Cache) == CFE_ES_CDS_ACCESS_ERROR,
               "CFE_ES_CDS_CacheFlush", "Access Error");
 
+    /* Test CDS registering with null Handle pointer */
+    ES_ResetUnitTest();
+    UtAssert_INT32_EQ(CFE_ES_RegisterCDS(NULL, 4, "Name3"), CFE_ES_BAD_ARGUMENT);
+
+    /* Test CDS registering with null name */
+    ES_ResetUnitTest();
+    UtAssert_INT32_EQ(CFE_ES_RegisterCDS(&CDSHandle, 4, NULL), CFE_ES_BAD_ARGUMENT);
+
     /* Test CDS registering with a write CDS failure */
     ES_ResetUnitTest();
     ES_UT_SetupSingleAppId(CFE_ES_AppType_CORE, CFE_ES_AppState_RUNNING, "UT", NULL, NULL);