diff --git a/x-pack/plugins/translations/translations/ja-JP.json b/x-pack/plugins/translations/translations/ja-JP.json
index bbfa7f1e19e41..638a39ddabc77 100644
--- a/x-pack/plugins/translations/translations/ja-JP.json
+++ b/x-pack/plugins/translations/translations/ja-JP.json
@@ -19635,7 +19635,6 @@
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.selectMessageText": "PagerDuty でイベントを送信します。",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectCriticalOptionLabel": "重大",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectErrorOptionLabel": "エラー",
-    "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectFieldLabel": "深刻度",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectInfoOptionLabel": "情報",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectWarningOptionLabel": "警告",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.sourceTextFieldLabel": "ソース (任意)",
diff --git a/x-pack/plugins/translations/translations/zh-CN.json b/x-pack/plugins/translations/translations/zh-CN.json
index fc9a2066e7f85..5535485376a24 100644
--- a/x-pack/plugins/translations/translations/zh-CN.json
+++ b/x-pack/plugins/translations/translations/zh-CN.json
@@ -19654,7 +19654,6 @@
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.selectMessageText": "在 PagerDuty 中发送事件。",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectCriticalOptionLabel": "紧急",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectErrorOptionLabel": "错误",
-    "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectFieldLabel": "严重性",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectInfoOptionLabel": "信息",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectWarningOptionLabel": "警告",
     "xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.sourceTextFieldLabel": "源（可选）",
diff --git a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.test.tsx b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.test.tsx
index 1aa64ef53f688..325580c2ab602 100644
--- a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.test.tsx
+++ b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.test.tsx
@@ -47,4 +47,25 @@ describe('PagerDutyParamsFields renders', () => {
     expect(wrapper.find('[data-test-subj="summaryInput"]').length > 0).toBeTruthy();
     expect(wrapper.find('[data-test-subj="dedupKeyAddVariableButton"]').length > 0).toBeTruthy();
   });
+
+  test('params select fields dont auto set values ', () => {
+    const actionParams = {};
+
+    const wrapper = mountWithIntl(
+      <PagerDutyParamsFields
+        actionParams={actionParams}
+        errors={{ summary: [], timestamp: [], dedupKey: [] }}
+        editAction={() => {}}
+        index={0}
+      />
+    );
+    expect(wrapper.find('[data-test-subj="severitySelect"]').length > 0).toBeTruthy();
+    expect(wrapper.find('[data-test-subj="severitySelect"]').first().prop('value')).toStrictEqual(
+      undefined
+    );
+    expect(wrapper.find('[data-test-subj="eventActionSelect"]').length > 0).toBeTruthy();
+    expect(
+      wrapper.find('[data-test-subj="eventActionSelect"]').first().prop('value')
+    ).toStrictEqual(undefined);
+  });
 });
diff --git a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.tsx b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.tsx
index 32f16760dd461..f136689a7c52c 100644
--- a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.tsx
+++ b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty/pagerduty_params.tsx
@@ -6,6 +6,7 @@
 import React, { Fragment } from 'react';
 import { EuiFlexGroup, EuiFlexItem, EuiFormRow, EuiSelect, EuiSpacer } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
+import { isUndefined } from 'lodash';
 import { ActionParamsProps } from '../../../../types';
 import { PagerDutyActionParams } from '.././types';
 import { TextFieldWithMessageVariables } from '../../text_field_with_message_variables';
@@ -106,7 +107,7 @@ const PagerDutyParamsFields: React.FunctionComponent<ActionParamsProps<PagerDuty
             label={i18n.translate(
               'xpack.triggersActionsUI.components.builtinActionTypes.pagerDutyAction.severitySelectFieldLabel',
               {
-                defaultMessage: 'Severity',
+                defaultMessage: 'Severity (optional)',
               }
             )}
           >
@@ -114,6 +115,7 @@ const PagerDutyParamsFields: React.FunctionComponent<ActionParamsProps<PagerDuty
               fullWidth
               data-test-subj="severitySelect"
               options={severityOptions}
+              hasNoInitialSelection={isUndefined(severity)}
               value={severity}
               onChange={(e) => {
                 editAction('severity', e.target.value, index);
@@ -135,6 +137,7 @@ const PagerDutyParamsFields: React.FunctionComponent<ActionParamsProps<PagerDuty
               fullWidth
               data-test-subj="eventActionSelect"
               options={eventActionOptions}
+              hasNoInitialSelection={isUndefined(eventAction)}
               value={eventAction}
               onChange={(e) => {
                 editAction('eventAction', e.target.value, index);
diff --git a/x-pack/plugins/triggers_actions_ui/public/application/lib/get_defaults_for_action_params.ts b/x-pack/plugins/triggers_actions_ui/public/application/lib/get_defaults_for_action_params.ts
index 36c054977ac30..d8431c4133be0 100644
--- a/x-pack/plugins/triggers_actions_ui/public/application/lib/get_defaults_for_action_params.ts
+++ b/x-pack/plugins/triggers_actions_ui/public/application/lib/get_defaults_for_action_params.ts
@@ -5,6 +5,7 @@
  */
 
 import { AlertActionParam, RecoveredActionGroup } from '../../../../alerts/common';
+import { EventActionOptions } from '../components/builtin_action_types/types';
 import { AlertProvidedActionVariables } from './action_variables';
 
 export const getDefaultsForActionParams = (
@@ -15,10 +16,10 @@ export const getDefaultsForActionParams = (
     case '.pagerduty':
       const pagerDutyDefaults = {
         dedupKey: `{{${AlertProvidedActionVariables.alertId}}}:{{${AlertProvidedActionVariables.alertInstanceId}}}`,
-        eventAction: 'trigger',
+        eventAction: EventActionOptions.TRIGGER,
       };
       if (actionGroupId === RecoveredActionGroup.id) {
-        pagerDutyDefaults.eventAction = 'resolve';
+        pagerDutyDefaults.eventAction = EventActionOptions.RESOLVE;
       }
       return pagerDutyDefaults;
   }