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B1638 on the 2019 Fiat 500X

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.

Bulletins for this model year that name B1638
S20080001252023-01-17. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S20080001252022-10-17. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S20080001252022-10-17. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S20080001252022-09-26. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S2008000125RevA2022-09-26. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S2008000125 Rev.2021-06-28. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S2008000125 Rev.2021-03-15. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64
S20080001252020-09-28. Service bulletin. Low Beam Headlamp Out Message Displayed On EVIC Intermittently. DTC B162F-64 Or B1638-64

8 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.