Box 12 letter code of W is only for Employer contributions to Health Savings Accounts. Code D is for retirement plans, such as a 401k.
Contact your employer payroll department if you believe there may be a mistake on your W-2 codes. If so, they would need to correct the form and send to IRS.
https://ttlc.intuit.com/questions/1899457-what-do-all-the-letter-codes-in-box-12-of-my-w-2-mean
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