400m Men Semifinals, Heat:2 of 2 ; Official result since 17:56
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 53 | JHON LLYOD H. CABALO | PALA | 51.11 | Q | |||
| 2 | 2 | 112 | PRAWIRANTO | SSUL | 52.01 | Q | |||
| 3 | 6 | 67 | ISAIAH NG JIAN LUNG | SBAH | 52.42 | Q | |||
| 4 | 5 | 80 | VANNESS AALAN HO | SAWK | 54.50 | q | |||
| 5 | 4 | 126 | AIDI IZHAR BIN ASRI | LBUN | 56.05 | ||||
| 6 | 7 | 26 | AK MUHD HAZIM BIN PG FADZIL HARITH | BRUB | 58.27 | ||||
| 7 | 1 | 27 | MUHD QAWIY HAFIZUDDIN | BRUB | 1:01.08 | ||||
| 8 | 98 | EVEANS OTENG | NORT | DNS |