Hi, I have a 2002 Grand Caravan, 50,000 miles. Van went into limp mode, had Auto Zone pull the codes: P0700 (something about the trans computer), P0750 (faulty Shift Selenoid). Took it into the the dealer to have it repaired. If it's just the shift selenoid, have any idea what this might cost me? I'm no longer under warranty. I live in SE Michigan. Thanks!