diff --git a/esphome/components/mpq4242/mpq4242.cpp b/esphome/components/mpq4242/mpq4242.cpp
index 769dc08..e84e3f6 100644
--- a/esphome/components/mpq4242/mpq4242.cpp
+++ b/esphome/components/mpq4242/mpq4242.cpp
@@ -76,7 +76,7 @@ void MPQ4242Component::setup() {
   }
 
   // Set GPIO functions
-  i2c::I2CRegister CTL_SYS2 = reg(MPQ4242_REGISTER_CTL_SYS17);
+  i2c::I2CRegister CTL_SYS2 = reg(MPQ4242_REGISTER_CTL_SYS2);
   // GPIO1 bits[7:5], GPIO2 bits[4:2]
   CTL_SYS2 |= (this->gpio1_function_ << 5) | (this->gpio2_function_ << 2);
 }
diff --git a/esphome/components/mpq4242/mpq4242.h b/esphome/components/mpq4242/mpq4242.h
index 982731d..b306ffb 100644
--- a/esphome/components/mpq4242/mpq4242.h
+++ b/esphome/components/mpq4242/mpq4242.h
@@ -81,6 +81,7 @@ static const uint8_t MPQ4242_REGISTER_PD_CTL2 = 0x17;
 static const uint8_t MPQ4242_REGISTER_PWR_CTL1 = 0x18;
 static const uint8_t MPQ4242_REGISTER_PWR_CTL2 = 0x19;
 static const uint8_t MPQ4242_REGISTER_CTL_SYS1 = 0x1E;
+static const uint8_t MPQ4242_REGISTER_CTL_SYS2 = 0x1F;
 static const uint8_t MPQ4242_REGISTER_CTL_SYS16 = 0x2D;
 static const uint8_t MPQ4242_REGISTER_CTL_SYS17 = 0x2E;
 static const uint8_t MPQ4242_REGISTER_STATUS1 = 0x30;
diff --git a/esphome/components/mpq4242/sensor/mpq4242_sensor.h b/esphome/components/mpq4242/sensor/mpq4242_sensor.h
index 1e77254..42b63ec 100644
--- a/esphome/components/mpq4242/sensor/mpq4242_sensor.h
+++ b/esphome/components/mpq4242/sensor/mpq4242_sensor.h
@@ -59,13 +59,6 @@ class MPQ4242Sensor : public PollingComponent {
  protected:
   MPQ4242Component *parent_;
 
-  /*
-    i2c::I2CRegister FW_REV;
-    i2c::I2CRegister MAX_REQ_CUR;
-    i2c::I2CRegister PWR_CTL2;
-    i2c::I2CRegister STATUS2;
-    i2c::I2CRegister STATUS3;
-  */
   i2c::I2CRegister FW_REV = this->parent_->reg(MPQ4242_REGISTER_FW_REV);
   i2c::I2CRegister MAX_REQ_CUR = this->parent_->reg(MPQ4242_REGISTER_MAX_REQ_CUR);
   i2c::I2CRegister PWR_CTL2 = this->parent_->reg(MPQ4242_REGISTER_PWR_CTL2);