intermittent ets light volvo s70
 

hello, I am the owner of a 2000 non turbo volvo s70, I have the ets light on with the car in limp mode, after changing the etm module the car worked fine for a few minutes but the ets light came back on with car in limp mode, however; when the car is hot, I disconnect the battery completely and connect it back, one time out of two the car is fine and runs perfect for the rest of the day until i park the car for the next day, when the car is cold it is systematically in limp mode.
need your opinion on that. could it be a bad ground, the alternator, a bad throttle body???need your help before I take the car to a mechanic who will charge me a leg to fix it. thank you again for reading and helping me.

Where did you get the replacement ETM?