Toyota bulletin TSB008523
What it saysTSB: Some 2016 ? 2023 model year Toyota vehicles may exhibit a hybrid system warning lamp occurring in below-freezing temperatures (below 32°F or 0°C). NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Nov 1, 2023, received Dec 26, 2023, about the electrical system. It names 47 model years (2016–2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationTSB: Some 2016 ? 2023 model year Toyota vehicles may exhibit a hybrid system warning lamp occurring in below-freezing temperatures (below 32°F or 0°C). After performing a Health Check, one or both of the following Diagnostic Trouble Codes (DTCs) may be present: ?P1C8449 ? (High Voltage Power Resource Circuit Short during Ready ON) ?P300449 ? (High Voltage Power Resource Circuit Short during Pre-Charge) Follow the Repair Procedure in this bulletin to address this condition.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TSB008523 | Service bulletin | Nov 1, 2023 | 10247796 | not found |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themand 7 more on this site: 2022 Toyota Sienna, 2021 Toyota Sienna, 2023 Toyota Tundra, 2022 Toyota Tundra, 2023 Toyota Venza, 2022 Toyota Venza, 2021 Toyota Venza.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 47 model years this bulletin names have filed 7,478 complaints with NHTSA since 2015. 676 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2020 Toyota RAV4, the 50 owners who gave an odometer reading for Electrical System reported it at a median of 3,023 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I purchased a new 2016 Prius four on february 16, 2016. The literature on the Toyota factory website says my Prius is equipped to switch from english to metric units. Unfortunately, Toyota failed to disclose that any Prius manufactured in january and february and delivered to the united states did not have this feature working correctly.
2016 Toyota Prius · Electrical System · filed with NHTSA Dec 25, 2016 · ODI 10937393
The contact owns a 2021 Toyota Rav4 Hybrid. The contact stated that on two separate occasions, while driving at high rates of speed, the vehicle stalled after slamming on the brake pedal. The contact waited approximately 20-30 seconds after the initial failure before being able to restart the vehicle and resume normal driving operation.
2021 Toyota RAV4 · Electrical System · filed with NHTSA Jan 26, 2024 · ODI 11568053
The contact owns a 2021 Toyota Sienna Hybrid. The contact stated that the vehicle was experiencing inaccurate fuel gauge readings. The contact stated while starting the vehicle, the fuel gauge reading displayed that the fuel tank was empty; however, while the contact was attempting to refuel the vehicle at the gas station, she became…
2021 Toyota Sienna · Electrical System · filed with NHTSA Jun 24, 2024 · ODI 11596197
In depth: 2020 Toyota Camry electrical problems → · 2018 Toyota Camry electrical problems → · 2020 Toyota RAV4 electrical problems → · 2019 Toyota RAV4 electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group89 other manufacturer communications filed against these Toyota models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26TC01 | Service campaign | Sep 8, 2026 | An electrical connection for the rear window defogger may not have been installed correctly during vehicle assembly. Overtime, this can caus… |
| T-SB-0050-26 | Over-the-air update | Aug 19, 2026 | A head unit software update (version 8612G42397) is now available for 2026 model year RAV4 Hybrid, and RAV4 Plug-in Hybrid vehicles via OTA… |
| 26TC02 | Service campaign | Jun 25, 2026 | After calibrating a trailer and using the Trailer Backup Guide feature, subsequent use of this feature may result in a “Trailer not detected… |
| T-TT-0803-26 | Service bulletin | May 21, 2026 | Some 26MY RAV4 HV/PHV vehicles with HU (head unit) versions 1136 or older may exhibit one or more of theintermittent conditions below: • No… |
| T-TT-0800-26 | Service bulletin | May 20, 2026 | Some 2026 RAV4 HV vehicles may display a Distance to Empty (DTE) that is higher than expected at initial fill-up. The DTE is computed using… |
| 22TE09 | Warranty extension | May 14, 2026 | Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36… |
| T-SB-0029-26 | Over-the-air update | Apr 24, 2026 | A new head unit software update is available for 2023 – 2024 model year RAV4, RAV4 Hybrid, and RAV4 Prime vehicles equipped with Toyota Mult… |
| T-SB-0021-26 | Service bulletin | Mar 18, 2026 | Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Toyota, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota TSB008523 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the TSB008523 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Toyota warranty extension on file lists the ones Toyota has filed.
Which vehicles does TSB008523 cover?
The manufacturer filed it against 47 model years: 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, 2019 Toyota Avalon, 2022 Toyota Camry, 2021 Toyota Camry and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.