If the key on the dash flashes during start. It measn the module are no wire correctly. Therefore your dash is giving indication that it's not the correct key and prevent it from start. You can test this theory by having the key in the ignition and do a remote start. You should see the key on the dash illuminate then goes away. Then the vehicle start. Depend on how you wire, sometimes the module will prevent stock key beign reconize by ECU. If your car doesn't reconize your key anymore. Disconnect the White harness from the module, and it will solve that issues. Good luck.