hello i have a 350z early 2004 model that has being tuned on UpRev so i’ve being trying to the get the car retuned again due to adding some more modifications on it but i have an issue now that whenever the tuner tries to flash the ecu it comes with CAN COMMUNICATION ERROR half way of flashing the ecu. then the car goes into lock mode red security light solid on the dash car will crank but not start until i disconnect the negative terminal and reconnect it back the car starts up just fine. so basically i can’t retune my ecu now with this issue if anyone can help me out with it would appreciate it

 

Have you called UpRev to ask about this problem?