Service bulletins for the 2019 Chevrolet Volt
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.
631 on file from NHTSA, as of 2026-10-19.
About P0AA1 on the 2019 Chevrolet Volt: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0AA1 are shown. Show all
| N192226060 | 2020-02-18. Service bulletin. EXTERIOR LIGHTING. Service Update. Certain vehicles may exhibit the high voltage bulkhead battery disconnect unit (BBDU) positive and/or negative contactors or relays, permanently or intermittently welded in the closed position. Contactors welded in the closed position will set DTC?s P0AA1 (positive), P0AA4 (negative), and P0C76 (hybrid). The malfunction indicator lamp (MIL) may also illuminate and vehicle may not start with this condition. Dealers will reprogram the hybrid powertrain control module. |
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| PIC6375 | 2019-12-09. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates that a program to repair the P0AA1 and P0AA4 is now available. Under specific unique conditions when the 12V battery voltage drops below a threshold, these DTCs may set. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.