| Cover | Aug. 16, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 16, 2024 |
| Entity File Number | 001-41414 |
| Entity Registrant Name | Phoenix Motor Inc. |
| Entity Central Index Key | 0001879848 |
| Entity Tax Identification Number | 85-4319789 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1500 Lakeview Loop |
| Entity Address, City or Town | Anaheim |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92807 |
| City Area Code | (909) |
| Local Phone Number | 987-0815 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0004 per share |
| Trading Symbol | PEV |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
