diff --git a/esphome/components/xl9535/__init__.py b/esphome/components/xl9535/__init__.py
index 7fcac50ba7..e6f8b28b46 100644
--- a/esphome/components/xl9535/__init__.py
+++ b/esphome/components/xl9535/__init__.py
@@ -43,11 +43,17 @@ def validate_mode(mode):
     return mode
 
 
+def validate_pin(pin):
+    if pin in (8, 9):
+        raise cv.Invalid(f"pin {pin} doesn't exist")
+    return pin
+
+
 XL9535_PIN_SCHEMA = cv.All(
     {
         cv.GenerateID(): cv.declare_id(XL9535GPIOPin),
         cv.Required(CONF_XL9535): cv.use_id(XL9535Component),
-        cv.Required(CONF_NUMBER): cv.int_range(min=0, max=15),
+        cv.Required(CONF_NUMBER): cv.All(cv.int_range(min=0, max=17), validate_pin),
         cv.Optional(CONF_MODE, default={}): cv.All(
             {
                 cv.Optional(CONF_INPUT, default=False): cv.boolean,
diff --git a/tests/test4.yaml b/tests/test4.yaml
index a5e5b05e8b..c27dbb65ac 100644
--- a/tests/test4.yaml
+++ b/tests/test4.yaml
@@ -425,6 +425,15 @@ binary_sensor:
         input: true
       inverted: false
 
+  - platform: gpio
+    name: XL9535 Pin 17
+    pin:
+      xl9535: xl9535_hub
+      number: 17
+      mode:
+        input: true
+      inverted: false
+
 climate:
   - platform: tuya
     id: tuya_climate