Page 1 is the verification and page 2 holds the body type model (BTM) codes and important notes.
Void: any missing sections, alterations, cross-outs, or erasures (even when initialed) will void this form and a new verification must be completed.
Sections: all numbered sections (1-9) below must have at least one box checked in each section.
VIN: a 17-digit VIN that passes check-digit is required on all 1981 and newer model year motor vehicles, and all 1985 and newer model year trailers.
Referral: all 1981 and newer model year vehicles with less than a 17-digit VIN must be referred to CHP for verification.
Version: the most current version of this form must be used.
| Question | Answer |
|---|---|
| Form Name | Form REG 31 |
| Form Length | 2 pages |
| Fillable? | Yes |
| Fillable fields | 9 |
| Avg. time to fill out | 2 min |
| Edition | 5/2025 |
| Who signs | Verifier signature; stamped or typed signature will not be accepted |
| Matches the agency's file | Yes, checked October 2, 2026 |
| Other names | REG 31, REG31, Form REG 31, Verification of Vehicle, VIN verification form |
| Official source | Form REG 31 (Rev 5/2025), California Department of Motor Vehicles |
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