Section 238 is part of the Assure Club. Most Assure Club ticketholders will have passes to park in one of the premium lots adjacent to the stadium. These include lots C, D and E, which are on the East side of the stadium and close to the best entrance for section 238.
Assuming you do not have a parking pass in one of those three lots, the closest general parking lot to section 238 is lot G on the southeast side of the stadium near Hart Bridge. That is one of the smallest stadium lots, so we recommend arriving early (which is recommended for club tickets as is).