B2A16 on Subaru vehicles

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Subaru filed with NHTSA whose summary names B2A16. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• 15-251-19R Service bulletin
  2022-10-18 · Equipment
• This Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 15-251-19R Service bulletin
  2024-01-11 · Electrical System
• This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 15-251-19R Service bulletin
  2024-08-05 · Electrical System
• This Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 15-251-19R Service bulletin
  2025-02-10 · Electrical System
• "This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16."
• 15-251-19 Service bulletin
  2019-09-26 · Electrical System
• This Service Information Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16. In most cases involving this DTC, the following scenario(s) occur: • When trying to use the remote engine starter (RES) feature through Telematics (STARLINK / My Subaru app) the request is unsuccessful and the red Telematics indicator lamp illuminates. • The customer
• 15-251-19R Service bulletin
  2019-11-18 · Equipment
• "This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16. In most cases involving this DTC, the following scenario(s) occur: • When trying to use the remote engine starter (RES) feature through Telematics (STARLINK / My Subaru app) the request is unsuccessful and the red Telematics indicator lamp illuminates. • The customer takes their v
• 15-251-19R Service bulletin
  2021-10-28 · Electrical System
• This bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 15-251-19R Service bulletin
  2021-12-29 · Electrical System
• This bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 15-251-19R Service bulletin
  2025-04-30 · Electrical System
• This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 18-226-25 Service bulletin
  2025-02-12 · Electrical System
• This Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 (Immobilizer Key Collation Diagnosis).
• 15-251-19R Service bulletin
  2025-06-24 · Electrical System
• This Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 18-226-25R Service bulletin
  2025-12-08 · Engine
• This Service Information Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 (Immobilizer Key Collation Diagnosis).

A stored code names the test that failed, never the part that caused it. The record above is what Subaru and its owners have filed about it; the code’s page across every make has the whole file.