TSB T-SB-0021-26 — Toyota Service bulletin
T-SB-0021-26 is a service bulletin on file with NHTSA for the Toyota Highlander, 2020–2024 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due to a leak and/or corrosion in the rear underbody air conditioner tube and accessory assembly. The anti-corrosion material has been updated…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years T-SB-0021-26 names
Every document filed under T-SB-0021-26
| Document ID | Filed | Type |
|---|---|---|
| T-SB-0021-26 | March 18, 2026 | Service bulletin |
What T-SB-0021-26 covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB T-SB-0021-26?
T-SB-0021-26 is a service bulletin filed with NHTSA by Toyota, covering the Toyota Highlander across the 2020–2024 model years. NHTSA's summary reads: Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due to a leak and/or corrosion in the rear underbody air conditioner tube and accessory assembly. The anti-corrosion material has been updated…
Which vehicles does T-SB-0021-26 cover?
NHTSA's file names Toyota Highlander (2020–2024). 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 T-SB-0021-26 a recall, and is the repair free?
No. T-SB-0021-26 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of T-SB-0021-26?
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 T-SB-0021-26, 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 T-SB-0021-26. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.