B2A20 on the 2026 Subaru Outback
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.
| 15-340-26 | 2026-08-04. Service bulletin. This bulletin announces the availability of reprogramming files for the Central Electronic Control Module (C-ECM). The updated logic has been developed to address Diagnostic Trouble Code (DTC) B2A20 - LOST COMMUNICATION ETHERNET FROM DCM TO HU. |
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| 07-240-26R | 2026-05-04. Service bulletin. This Service Information Bulletin was developed to provide interim guidance for vehicles exhibiting DTC B2A20. |
| 07-240-26R | 2026-03-03. Service bulletin. This Service Information Bulletin was developed to provide interim guidance for 2026 model year vehicles exhibiting DTC B2A20 with gen 4 Telematics. |
3 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.