diff --git a/mod_ci/controllers.py b/mod_ci/controllers.py
index 1e0498f4..d66c1e62 100755
--- a/mod_ci/controllers.py
+++ b/mod_ci/controllers.py
@@ -126,12 +126,20 @@ def safe_db_commit(db, operation_description: str = "database operation") -> boo
         return False
 
 
-# User-friendly messages for known GCP error codes
+_ZONE_EXHAUSTED_MESSAGE = (
+    "GCP resources temporarily unavailable in the configured zone. "
+    "The test will be retried automatically when resources become available."
+)
+
+# User-friendly messages for known GCP error codes.
+#
+# GCP reports zone exhaustion under two codes: the bare ZONE_RESOURCE_POOL_EXHAUSTED and
+# ZONE_RESOURCE_POOL_EXHAUSTED_WITH_DETAILS, which carries the specific resource that ran
+# out. Both mean the same thing to us, and in practice the _WITH_DETAILS variant is the one
+# Compute Engine returns for instance inserts.
 GCP_ERROR_MESSAGES = {
-    'ZONE_RESOURCE_POOL_EXHAUSTED': (
-        "GCP resources temporarily unavailable in the configured zone. "
-        "The test will be retried automatically when resources become available."
-    ),
+    'ZONE_RESOURCE_POOL_EXHAUSTED': _ZONE_EXHAUSTED_MESSAGE,
+    'ZONE_RESOURCE_POOL_EXHAUSTED_WITH_DETAILS': _ZONE_EXHAUSTED_MESSAGE,
     'QUOTA_EXCEEDED': (
         "GCP quota limit reached. "
         "The test will be retried automatically when resources become available."
@@ -145,6 +153,7 @@ def safe_db_commit(db, operation_description: str = "database operation") -> boo
 # Tests encountering these errors will remain pending and be picked up on the next cron run.
 GCP_RETRYABLE_ERRORS = {
     'ZONE_RESOURCE_POOL_EXHAUSTED',
+    'ZONE_RESOURCE_POOL_EXHAUSTED_WITH_DETAILS',
     'QUOTA_EXCEEDED',
 }
 
diff --git a/tests/test_ci/test_controllers.py b/tests/test_ci/test_controllers.py
index 3b55ef89..b8472f34 100644
--- a/tests/test_ci/test_controllers.py
+++ b/tests/test_ci/test_controllers.py
@@ -3294,6 +3294,45 @@ def test_parse_gcp_error_zone_resource_exhausted(self):
         # Should NOT contain raw technical details
         self.assertNotIn("us-central1-a", error_msg)
 
+    def test_parse_gcp_error_zone_resource_exhausted_with_details(self):
+        """Test that the _WITH_DETAILS variant gets the same user-friendly message."""
+        from mod_ci.controllers import parse_gcp_error
+
+        mock_log = MagicMock()
+        result = {
+            'status': 'DONE',
+            'error': {
+                'errors': [{
+                    'code': 'ZONE_RESOURCE_POOL_EXHAUSTED_WITH_DETAILS',
+                    'message': "The zone 'projects/test/zones/us-central1-a' does not have enough "
+                               "resources available to fulfill the request. '(resource type:compute)'."
+                }]
+            }
+        }
+
+        error_msg = parse_gcp_error(result, log=mock_log)
+        self.assertIn("GCP resources temporarily unavailable", error_msg)
+        self.assertIn("retried automatically", error_msg)
+        # Must not fall through to the generic "contact the administrator" message
+        self.assertNotIn("contact the administrator", error_msg)
+        self.assertNotIn("us-central1-a", error_msg)
+
+    def test_zone_resource_exhausted_variants_are_retryable(self):
+        """Both zone-exhaustion codes must be retryable so the test stays pending."""
+        from mod_ci.controllers import is_retryable_gcp_error
+
+        for code in ('ZONE_RESOURCE_POOL_EXHAUSTED', 'ZONE_RESOURCE_POOL_EXHAUSTED_WITH_DETAILS'):
+            with self.subTest(code=code):
+                result = {'error': {'errors': [{'code': code, 'message': 'no capacity'}]}}
+                self.assertTrue(is_retryable_gcp_error(result))
+
+    def test_non_transient_gcp_error_is_not_retryable(self):
+        """A genuine failure must still be marked failed rather than retried forever."""
+        from mod_ci.controllers import is_retryable_gcp_error
+
+        result = {'error': {'errors': [{'code': 'RESOURCE_NOT_FOUND', 'message': 'nope'}]}}
+        self.assertFalse(is_retryable_gcp_error(result))
+
     def test_parse_gcp_error_quota_exceeded(self):
         """Test that QUOTA_EXCEEDED returns user-friendly message."""
         from mod_ci.controllers import parse_gcp_error