My HC-05 can connect to my phone but it doesn't send any data to Arduino

[hello_thanh_an_ishere]

I'm making a Bluetooth RC Car, the code is fine, everything is fine but the only issue here is the HC-05, when i press forward or backward, left, right on my phone, the LED on the motor shield doesn't blink, I think it doesn't send any data to my Arduino.
I can get it to AT mode but the command doesn't respond anything (it didn't said OK)
Is my module broken? Do I have to buy a new one? Is there any way to fix it?

[Boffin]

You should at least give your wiring diagram and your code.
It is very difficult to say anything without this information.

[groundFungus]

Here is simple Bluetooth test code using software serial and HC05 connected HC05 TX to Uno pin 7 and HC05 RX connected to Uno pin 8 through voltage divider.

#include <SoftwareSerial.h>

SoftwareSerial BTserial(7, 8); // RX | TX

void setup()
{
   Serial.begin(9600);
   BTserial.begin(9600);
   Serial.println("Bluetooth send and receive test.");
}

void loop()
{
   if (Serial.available())
   {
      BTserial.write(Serial.read());
   }
   if (BTserial.available())
   {
      Serial.print(char(BTserial.read()));
   }
}

[drmpf]

On the Android side try Bluetooth Terminal app to send cmds
HC-05 is a Classic bluetooth module not BLE