diff --git a/app/models/commit_status.rb b/app/models/commit_status.rb
index 1c4088d5af9..1e8f28b6466 100644
--- a/app/models/commit_status.rb
+++ b/app/models/commit_status.rb
@@ -42,7 +42,7 @@ class CommitStatus < ActiveRecord::Base
     unknown_failure: nil,
     job_failure: 1,
     api_failure: 2,
-    stuck_or_timeout_failure: 3,
+    stuck_or_timeout_failure: 3
   }
 
   state_machine :status do
diff --git a/changelogs/unreleased/feature-sm-37239-implement-failure_reason-on-ci_builds.yml b/changelogs/unreleased/feature-sm-37239-implement-failure_reason-on-ci_builds.yml
new file mode 100644
index 00000000000..006b0b45844
--- /dev/null
+++ b/changelogs/unreleased/feature-sm-37239-implement-failure_reason-on-ci_builds.yml
@@ -0,0 +1,5 @@
+---
+title: Implement `failure_reason` on `ci_builds`
+merge_request: 13937
+author:
+type: added
diff --git a/lib/api/runner.rb b/lib/api/runner.rb
index 701c1bff1e0..44ca42fef68 100644
--- a/lib/api/runner.rb
+++ b/lib/api/runner.rb
@@ -114,6 +114,8 @@ module API
         requires :id, type: Integer, desc: %q(Job's ID)
         optional :trace, type: String, desc: %q(Job's full trace)
         optional :state, type: String, desc: %q(Job's status: success, failed)
+        optional :failure_reason, type: String, values: CommitStatus.failure_reasons.keys,
+                                  desc: %q(Job's failure_reason)
       end
       put '/:id' do
         job = authenticate_job!
@@ -127,7 +129,11 @@ module API
         when 'success'
           job.success
         when 'failed'
-          job.drop(:job_failure)
+          if params[:failure_reason]
+            job.drop(params[:failure_reason].to_sym)
+          else
+            job.drop(:job_failure)
+          end
         end
       end
 
diff --git a/spec/lib/gitlab/import_export/safe_model_attributes.yml b/spec/lib/gitlab/import_export/safe_model_attributes.yml
index 27f2ce60084..b852ac570a3 100644
--- a/spec/lib/gitlab/import_export/safe_model_attributes.yml
+++ b/spec/lib/gitlab/import_export/safe_model_attributes.yml
@@ -278,6 +278,7 @@ CommitStatus:
 - auto_canceled_by_id
 - retried
 - protected
+- failure_reason
 Ci::Variable:
 - id
 - project_id
diff --git a/spec/models/commit_status_spec.rb b/spec/models/commit_status_spec.rb
index 4fd330ab7dc..f5c1db79823 100644
--- a/spec/models/commit_status_spec.rb
+++ b/spec/models/commit_status_spec.rb
@@ -445,22 +445,20 @@ describe CommitStatus do
   end
 
   describe 'set failure_reason when drop' do
-    let(:build) { create(:ci_build, :created) }
+    let(:commit_status) { create(:commit_status, :created) }
 
-    before do
-      build.drop!(reason)
-    end
+    subject { commit_status.drop!(reason); commit_status }
 
     context 'when failure_reason is nil' do
       let(:reason) { }
 
-      it { expect(build).to be_unknown_failure }
+      it { is_expected.to be_unknown_failure }
     end
 
     context 'when failure_reason is job_failure' do
       let(:reason) { :job_failure }
 
-      it { expect(build).to be_job_failure }
+      it { is_expected.to be_job_failure }
     end
   end
 end
diff --git a/spec/requests/api/commit_statuses_spec.rb b/spec/requests/api/commit_statuses_spec.rb
index e4c73583545..ed1962ede42 100644
--- a/spec/requests/api/commit_statuses_spec.rb
+++ b/spec/requests/api/commit_statuses_spec.rb
@@ -143,7 +143,7 @@ describe API::CommitStatuses do
               expect(json_response['target_url']).to be_nil
               expect(json_response['description']).to be_nil
               if status == 'failed'
-                expect(CommitStatus.find(json_response['id'])).to be_api_failure
+                expect(json_response['failure_reason']).to eq('api_failure')
               end
             end
           end
diff --git a/spec/requests/api/runner_spec.rb b/spec/requests/api/runner_spec.rb
index 386e76c6300..f9dcd9d07cb 100644
--- a/spec/requests/api/runner_spec.rb
+++ b/spec/requests/api/runner_spec.rb
@@ -636,6 +636,15 @@ describe API::Runner do
           expect(job.reload.status).to eq 'failed'
           expect(job).to be_job_failure
         end
+
+        context 'when failure_reason is given' do
+          it 'mark job as failed' do
+            update_job(state: 'failed', failure_reason: 'stuck_or_timeout_failure')
+
+            expect(job.reload.status).to eq 'failed'
+            expect(job).to be_stuck_or_timeout_failure
+          end
+        end
       end
 
       context 'when tace is given' do
diff --git a/spec/services/ci/retry_build_service_spec.rb b/spec/services/ci/retry_build_service_spec.rb
index 7c9c117bf71..f5ed9ff608f 100644
--- a/spec/services/ci/retry_build_service_spec.rb
+++ b/spec/services/ci/retry_build_service_spec.rb
@@ -22,7 +22,7 @@ describe Ci::RetryBuildService do
     %i[type lock_version target_url base_tags
        commit_id deployments erased_by_id last_deployment project_id
        runner_id tag_taggings taggings tags trigger_request_id
-       user_id auto_canceled_by_id retried].freeze
+       user_id auto_canceled_by_id retried failure_reason].freeze
 
   shared_examples 'build duplication' do
     let(:stage) do