diff --git a/tests/hwsim/test_dpp.py b/tests/hwsim/test_dpp.py
index 616ef65d4..fee8180a4 100644
--- a/tests/hwsim/test_dpp.py
+++ b/tests/hwsim/test_dpp.py
@@ -1527,6 +1527,42 @@ def run_dpp_pkex(dev, apdev, curve=None, init_extra="", check_config=False):
         if ev is None:
             raise Exception("DPP configuration not completed (Enrollee)")
 
+def test_dpp_pkex_code_mismatch(dev, apdev):
+    """DPP and PKEX with mismatching code"""
+    check_dpp_capab(dev[0])
+    check_dpp_capab(dev[1])
+
+    cmd = "DPP_BOOTSTRAP_GEN type=pkex"
+    res = dev[0].request(cmd)
+    if "FAIL" in res:
+        raise Exception("Failed to generate bootstrapping info")
+    id0 = int(res)
+
+    cmd = "DPP_BOOTSTRAP_GEN type=pkex"
+    res = dev[1].request(cmd)
+    if "FAIL" in res:
+        raise Exception("Failed to generate bootstrapping info")
+    id1 = int(res)
+
+    cmd = "DPP_PKEX_ADD own=%d identifier=test code=secret" % (id0)
+    res = dev[0].request(cmd)
+    if "FAIL" in res:
+        raise Exception("Failed to set PKEX data (responder)")
+    cmd = "DPP_LISTEN 2437"
+    if "OK" not in dev[0].request(cmd):
+        raise Exception("Failed to start listen operation")
+
+    cmd = "DPP_PKEX_ADD own=%d identifier=test init=1 code=unknown" % id1
+    res = dev[1].request(cmd)
+    if "FAIL" in res:
+        raise Exception("Failed to set PKEX data (initiator)")
+
+    ev = dev[0].wait_event(["DPP-FAIL"], timeout=5)
+    if ev is None:
+        raise Exception("Failure not reported")
+    if "possible PKEX code mismatch" not in ev:
+        raise Exception("Unexpected result: " + ev)
+
 def test_dpp_pkex_config2(dev, apdev):
     """DPP and PKEX with responder as the configurator"""
     check_dpp_capab(dev[0])