My arduino RC car with HC05 doesn't work

I don't think any of my components have died. I'm only using 4 DC motors that i have tried with other codes and they work perfectly fine. A motor shield that also works perfectly fine, and last I have the HC-05 that before I connect to it on my android device blinks frequently, and when I connect it says in the app: "Successfully connected" and then the LED on the module only blinks sometimes, which I indicate as it is connected. I'm lost. I have tried the same app on many android devices and none work for my RC car. I have tried different Bluetooth modules. Many different codes, asked a lot of people for help, but i can't seem to find an answer to what my problem is. Everything worked fine until I went to the toilet for five minutes and when I came back nothing, and absolutely nothing on my car worked. I really need help with this, and if you guys have any suggestions for codes that i can try that would have been great. I have an assignment where I'm going to present my car, but I don't think I will be able to now...

If you guys have any tips that would be super appreciated.

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