diff --git a/modules/id5IdSystem.js b/modules/id5IdSystem.js
index 1d55450239b..151782791af 100644
--- a/modules/id5IdSystem.js
+++ b/modules/id5IdSystem.js
@@ -49,17 +49,24 @@ export const id5IdSubmodule = {
     const url = `https://id5-sync.com/g/v1/${configParams.partner}.json?1puid=${storedUserId ? storedUserId.id5id : ''}&gdpr=${hasGdpr}&gdpr_consent=${gdprConsentString}`;
 
     const resp = function (callback) {
-      ajax(url, response => {
-        let responseObj;
-        if (response) {
-          try {
-            responseObj = JSON.parse(response);
-          } catch (error) {
-            utils.logError(error);
+      const callbacks = {
+        success: response => {
+          let responseObj;
+          if (response) {
+            try {
+              responseObj = JSON.parse(response);
+            } catch (error) {
+              utils.logError(error);
+            }
           }
+          callback(responseObj);
+        },
+        error: error => {
+          utils.logError(`id5Id: ID fetch encountered an error`, error);
+          callback();
         }
-        callback(responseObj);
-      }, undefined, { method: 'GET', withCredentials: true });
+      };
+      ajax(url, callbacks, undefined, { method: 'GET', withCredentials: true });
     };
     return {callback: resp};
   }
diff --git a/modules/identityLinkIdSystem.js b/modules/identityLinkIdSystem.js
index 47d8ad9ac05..a7114c2a147 100644
--- a/modules/identityLinkIdSystem.js
+++ b/modules/identityLinkIdSystem.js
@@ -63,17 +63,24 @@ export const identityLinkSubmodule = {
 };
 // return envelope from third party endpoint
 function getEnvelope(url, callback) {
-  ajax(url, response => {
-    let responseObj;
-    if (response) {
-      try {
-        responseObj = JSON.parse(response);
-      } catch (error) {
-        utils.logError(error);
+  const callbacks = {
+    success: response => {
+      let responseObj;
+      if (response) {
+        try {
+          responseObj = JSON.parse(response);
+        } catch (error) {
+          utils.logError(error);
+        }
       }
+      callback(responseObj.envelope);
+    },
+    error: error => {
+      utils.logError(`identityLink: ID fetch encountered an error`, error);
+      callback();
     }
-    callback(responseObj.envelope);
-  }, undefined, {method: 'GET', withCredentials: true});
+  };
+  ajax(url, callbacks, undefined, {method: 'GET', withCredentials: true});
 }
 
 submodule('userId', identityLinkSubmodule);
diff --git a/modules/liveIntentIdSystem.js b/modules/liveIntentIdSystem.js
index 3f5d0602166..b0e8cfc1c0f 100644
--- a/modules/liveIntentIdSystem.js
+++ b/modules/liveIntentIdSystem.js
@@ -143,17 +143,24 @@ export const liveIntentIdSubmodule = {
     // Don't do the internal ajax call, but use the composed url and fire it via PBJS ajax module
     const url = liveConnect.resolutionCallUrl();
     const result = function (callback) {
-      ajax(url, response => {
-        let responseObj = {};
-        if (response) {
-          try {
-            responseObj = JSON.parse(response);
-          } catch (error) {
-            utils.logError(error);
+      const callbacks = {
+        success: response => {
+          let responseObj = {};
+          if (response) {
+            try {
+              responseObj = JSON.parse(response);
+            } catch (error) {
+              utils.logError(error);
+            }
           }
+          callback(responseObj);
+        },
+        error: error => {
+          utils.logError(`${MODULE_NAME}: ID fetch encountered an error: `, error);
+          callback();
         }
-        callback(responseObj);
-      }, undefined, { method: 'GET', withCredentials: true });
+      };
+      ajax(url, callbacks, undefined, { method: 'GET', withCredentials: true });
     };
     return {callback: result};
   }
diff --git a/modules/parrableIdSystem.js b/modules/parrableIdSystem.js
index ba5fae81952..8c487c783ae 100644
--- a/modules/parrableIdSystem.js
+++ b/modules/parrableIdSystem.js
@@ -52,19 +52,25 @@ function fetchId(configParams, currentStoredId) {
   };
 
   const callback = function (cb) {
-    const onSuccess = (response) => {
-      let eid;
-      if (response) {
-        try {
-          let responseObj = JSON.parse(response);
-          eid = responseObj ? responseObj.eid : undefined;
-        } catch (error) {
-          utils.logError(error);
+    const callbacks = {
+      success: response => {
+        let eid;
+        if (response) {
+          try {
+            let responseObj = JSON.parse(response);
+            eid = responseObj ? responseObj.eid : undefined;
+          } catch (error) {
+            utils.logError(error);
+          }
         }
+        cb(eid);
+      },
+      error: error => {
+        utils.logError(`parrableId: ID fetch encountered an error`, error);
+        cb();
       }
-      cb(eid);
     };
-    ajax(PARRABLE_URL, onSuccess, searchParams, options);
+    ajax(PARRABLE_URL, callbacks, searchParams, options);
   };
 
   return { callback };
diff --git a/modules/unifiedIdSystem.js b/modules/unifiedIdSystem.js
index 9995a260c26..f916030d643 100644
--- a/modules/unifiedIdSystem.js
+++ b/modules/unifiedIdSystem.js
@@ -42,17 +42,24 @@ export const unifiedIdSubmodule = {
     const url = configParams.url || `https://match.adsrvr.org/track/rid?ttd_pid=${configParams.partner}&fmt=json`;
 
     const resp = function (callback) {
-      ajax(url, response => {
-        let responseObj;
-        if (response) {
-          try {
-            responseObj = JSON.parse(response);
-          } catch (error) {
-            utils.logError(error);
+      const callbacks = {
+        success: response => {
+          let responseObj;
+          if (response) {
+            try {
+              responseObj = JSON.parse(response);
+            } catch (error) {
+              utils.logError(error);
+            }
           }
+          callback(responseObj);
+        },
+        error: error => {
+          utils.logError(`${MODULE_NAME}: ID fetch encountered an error`, error);
+          callback();
         }
-        callback(responseObj);
-      }, undefined, {method: 'GET', withCredentials: true});
+      };
+      ajax(url, callbacks, undefined, {method: 'GET', withCredentials: true});
     };
     return {callback: resp};
   }
diff --git a/test/spec/modules/liveIntentIdSystem_spec.js b/test/spec/modules/liveIntentIdSystem_spec.js
index c3c9c8dc38d..85e0d30b348 100644
--- a/test/spec/modules/liveIntentIdSystem_spec.js
+++ b/test/spec/modules/liveIntentIdSystem_spec.js
@@ -158,6 +158,22 @@ describe('LiveIntentId', function () {
     expect(callBackSpy.calledOnce).to.be.true;
   });
 
+  it('should log an error and continue to callback if ajax request errors', function () {
+    getCookieStub.returns(null);
+    let callBackSpy = sinon.spy();
+    let submoduleCallback = liveIntentIdSubmodule.getId(defaultConfigParams).callback;
+    submoduleCallback(callBackSpy);
+    let request = server.requests[0];
+    expect(request.url).to.be.eq('https://idx.liadm.com/idex/prebid/89899');
+    request.respond(
+      503,
+      responseHeader,
+      'Unavailable'
+    );
+    expect(logErrorStub.calledOnce).to.be.true;
+    expect(callBackSpy.calledOnce).to.be.true;
+  });
+
   it('should include the LiveConnect identifier when calling the LiveIntent Identity Exchange endpoint', function () {
     const oldCookie = 'a-xxxx--123e4567-e89b-12d3-a456-426655440000'
     getDataFromLocalStorageStub.withArgs('_li_duid').returns(oldCookie);
diff --git a/test/spec/modules/parrableIdSystem_spec.js b/test/spec/modules/parrableIdSystem_spec.js
index 662f63f6638..0183a6f79d4 100644
--- a/test/spec/modules/parrableIdSystem_spec.js
+++ b/test/spec/modules/parrableIdSystem_spec.js
@@ -110,6 +110,7 @@ describe('Parrable ID System', function() {
 
   describe('Parrable ID in Bid Request', function() {
     let adUnits;
+    let logErrorStub;
 
     beforeEach(function() {
       adUnits = [getAdUnitMock()];
@@ -122,10 +123,12 @@ describe('Parrable ID System', function() {
       setSubmoduleRegistry([parrableIdSubmodule]);
       init(config);
       config.setConfig(getConfigMock());
+      logErrorStub = sinon.stub(utils, 'logError');
     });
 
     afterEach(function() {
       storage.setCookie(P_COOKIE_NAME, '', EXPIRED_COOKIE_DATE);
+      logErrorStub.restore();
     });
 
     it('provides the parrableid in the bid request', function(done) {
@@ -139,5 +142,20 @@ describe('Parrable ID System', function() {
         done();
       }, { adUnits });
     });
+
+    it('should log an error and continue to callback if ajax request errors', function () {
+      let callBackSpy = sinon.spy();
+      let submoduleCallback = parrableIdSubmodule.getId({partner: 'prebid'}).callback;
+      submoduleCallback(callBackSpy);
+      let request = server.requests[0];
+      expect(request.url).to.contain('h.parrable.com');
+      request.respond(
+        503,
+        null,
+        'Unavailable'
+      );
+      expect(logErrorStub.calledOnce).to.be.true;
+      expect(callBackSpy.calledOnce).to.be.true;
+    });
   });
 });