TSB B21673 — Acura Software update
B21673 is a software update on file with NHTSA for the Acura RDX, 2019–2021 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Over The Air Update - Vehicles equipped with the System Updates application are capable of downloading and installing Over the Air System Updates. System Updates contain upgrades that fix a variety of operational errors and/or enhancements that add new functionality. Information…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. B21673 is filed as a software update, which unlike an ordinary bulletin can mean free or reimbursed work when a vehicle qualifies. Ask a dealer using the document ID below, and check open recalls separately at nhtsa.gov/recalls.
Vehicles and model years B21673 names
Every document filed under B21673
| Document ID | Filed | Type |
|---|---|---|
| B21673 | May 18, 2026 | Software update |
What B21673 covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB B21673?
B21673 is a software update filed with NHTSA by Acura, covering the Acura RDX across the 2019–2021 model years. NHTSA's summary reads: Over The Air Update - Vehicles equipped with the System Updates application are capable of downloading and installing Over the Air System Updates. System Updates contain upgrades that fix a variety of operational errors and/or enhancements that add new functionality. Information…
Which vehicles does B21673 cover?
NHTSA's file names Acura RDX (2019–2021). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB B21673 a recall, and is the repair free?
B21673 is filed as a software update, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.
How do I get the full text of B21673?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under B21673, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under B21673. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.