diff --git a/tests/components/pzemac/test.esp32-idf.yaml b/tests/components/pzemac/test.esp32-idf.yaml
index 37d98696cc..b631e16677 100644
--- a/tests/components/pzemac/test.esp32-idf.yaml
+++ b/tests/components/pzemac/test.esp32-idf.yaml
@@ -1,6 +1,7 @@
 substitutions:
   tx_pin: GPIO4
   rx_pin: GPIO5
+  flow_control_pin: GPIO13
 
 packages:
   modbus: !include ../../test_build_components/common/modbus/esp32-idf.yaml
diff --git a/tests/components/pzemdc/test.esp32-idf.yaml b/tests/components/pzemdc/test.esp32-idf.yaml
index 37d98696cc..b631e16677 100644
--- a/tests/components/pzemdc/test.esp32-idf.yaml
+++ b/tests/components/pzemdc/test.esp32-idf.yaml
@@ -1,6 +1,7 @@
 substitutions:
   tx_pin: GPIO4
   rx_pin: GPIO5
+  flow_control_pin: GPIO13
 
 packages:
   modbus: !include ../../test_build_components/common/modbus/esp32-idf.yaml
diff --git a/tests/components/sdm_meter/test.esp32-idf.yaml b/tests/components/sdm_meter/test.esp32-idf.yaml
index 37d98696cc..b631e16677 100644
--- a/tests/components/sdm_meter/test.esp32-idf.yaml
+++ b/tests/components/sdm_meter/test.esp32-idf.yaml
@@ -1,6 +1,7 @@
 substitutions:
   tx_pin: GPIO4
   rx_pin: GPIO5
+  flow_control_pin: GPIO13
 
 packages:
   modbus: !include ../../test_build_components/common/modbus/esp32-idf.yaml