Service bulletins for the 2015 Chevrolet Impala
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
1659 on file from NHTSA, as of 2026-10-19.
About P0621 on the 2015 Chevrolet Impala: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
By topic
Only bulletins with trouble code: P0621 are shown. Show all
| PI1409A | 2021-09-07. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE. Malfunction Indicator Lamp (MIL) Illuminated with DTCs P2096 and/or P0621 Set |
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| PIC6017A | 2017-08-15. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. 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. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ENGINE. 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. FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:FILLING/CHARGING. GENERAL MOTORS 2014-2015 CHEVROLET MALIBU, 2015 CHEVROLET IMPALA: INTERMITTENT SERVICE CHARGING SYSTEM MESSAGE/ BATTERY MIL DTC P0621. *LJ |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.