P0621 on the 2015 Chevrolet Malibu
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.
Nobody has written a description of this code yet.
| PI1409A | 2021-04-26. Service bulletin. Malfunction Indicator Lamp (MIL) Illuminated with DTCs P2096 and/or P0621 Set Condition/Concern Some customers may comment on the malfunction indicator lamp (MIL) being illuminated. Technicians may find diagnostic trouble codes (DTCs) P2096: Post Catalyst Fuel Trim System Low and/or P0621: Generator L-Terminal Circuit set as current or history |
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| PIC6017A | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have an intermittent "Service Charging System" message on the Driver Information Center or a Battery Malfunction Indicator Lamp during an auto stop event. If there is no fault found during diagnostics for P0621 contact General Motors Technical Assistance Center for further assistance. |
| PI1409 | 2017-08-15. Service bulletin. This preliminary informational bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated with technicians finding DTCs P2096 and/or P0621 set. |
| PIC6017A | 2015-06-11. Service bulletin. GENERAL MOTORS 2014-2015 CHEVROLET MALIBU, 2015 CHEVROLET IMPALA: INTERMITTENT SERVICE CHARGING SYSTEM MESSAGE/ BATTERY MIL DTC P0621. *LJ |
4 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.