key code?

on my corsa i put the jump leads on the rong terminals.in turn it has apparantly disabled my car as in ,key code .cousing it to scramble my E C U unit .can any nice guy or lady tell me wt the damage is The veichle is at vauxhall dealers getting diognostic .but i no i will be told somthing else .it has cost me 160 just to get it ther already due to it been towed to and from .help