C1642 on the 2025 Kia K5
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| TSB_ELE376 | 2025-04-25. Service bulletin. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ACU OPERATION LOGIC IMPROVEMENT (SA609) - This bulletin provides information to upgrade the Airbag Control Unit ‘ACU’ system software on certain 2025MY K5 (DL3) vehicles produced from February 20, 2024 to October 25, 2024. In rare cases when the driver restarts the vehicle within 1.5 seconds after turning the ignition ‘OFF’, the affected vehicles may exhibit the “ESC/Forward Collision Avoidance System” warning light(s) illuminating for up the three (3) minutes with DTC(s) C128387 and/or C164286 stored. During this time, Electronic Stability Control ‘ESC’, Forward Collision—Avoidance Assist ‘FCA’ and Lane Keeping Assist ‘LKA’ functions are inoperable |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.