How do I find my MCS-150 PIN?
The 5-digit USDOT PIN was mailed to your business address when the USDOT was first issued. To recover a lost PIN, request a re-mail through the FMCSA portal — the PIN is mailed to the address on file in 7-14 business days. There is no email or phone reset.
The PIN is paired with the USDOT number and is required to file MCS-150 directly through the FMCSA portal. It is a 5-digit code printed on the original USDOT registration mail packet.
For a PIN reset, FMCSA only mails — there is no phone or email recovery. The mailed PIN goes to the registered business address. For carriers who have moved since the original USDOT issuance, the PIN may be going to the old address.
The chicken-and-egg fix: file an MCS-150 to update the business address first (a commercial filing service can do this without your PIN), then request the PIN reset, which now mails to the updated address.
For one-off filings, most carriers find it faster to file through a commercial filing service that has FMCSA portal access — the service files MCS-150 on your behalf and you never need the PIN.