Arduino 4 motor code

My motor ArG are not working the pin 0 and pin 1 never work but the 3 other motor work

// 1. les constante des pin moteur
const int motorAG = 2;
const int motorArG = 1;
const int motorAD = 6;
const int motorArD = 4;

const int motorAG1 = 3;
const int motorArG1 = 0;
const int motorAD1 = 7;
const int motorArD1 = 5;

void setup() {

Serial.begin(9600);

// indique les rôle des pin moteur
pinMode(motorAG,OUTPUT);
pinMode(motorArG,OUTPUT);
pinMode(motorAD,OUTPUT);
pinMode(motorArD,OUTPUT);

pinMode(motorAG1,OUTPUT);
pinMode(motorArG1,OUTPUT);
pinMode(motorAD1,OUTPUT);
pinMode(motorArD1,OUTPUT);

}

void loop() {

digitalWrite(motorAG,LOW);
digitalWrite(motorArG,LOW);
digitalWrite(motorAD,LOW);
digitalWrite(motorArD,LOW );

digitalWrite(motorAG,HIGH);
digitalWrite(motorArG,HIGH);
digitalWrite(motorAD,HIGH);
digitalWrite(motorArD,HIGH);

delay(1000);

exit(0);

}