bat steps in Jenkins never fail:

 

---

pipeline
{
agent any

stages
{
stage('Build')
{
steps

{ bat returnStatus: true, script: ''' EXIT 1 ''' }

}
}
}

---

 

(Formatting above is scrambled by Jira)

 

... results in:

---

[Jenkins Test-Pipeline] Running batch script

C:\Program Files (x86)\Jenkins\workspace\Jenkins Test-Pipeline>EXIT 1
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS