# Service bulletin TSB008523

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10247796
- Published by NHTSA: 2023\-12\-26
- Manufacturer's number: TSB008523
- Manufacturer's date: 2023\-11\-01
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

TSB: 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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10247796-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10247796-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Trouble codes named

P1C84, P3004

## Vehicles listed

- 2019 to 2022 TOYOTA AVALON HYBRID
- 2018 to 2022 TOYOTA CAMRY HYBRID
- 2022 TOYOTA COROLLA
- 2023 TOYOTA CROWN
- 2020 to 2023 TOYOTA HIGHLANDER HYBRID
- 2021 to 2023 TOYOTA MIRAI
- 2016 to 2022 TOYOTA PRIUS
- 2017 to 2022 TOYOTA PRIUS PRIME
- 2019 to 2023 TOYOTA RAV4 HYBRID
- 2021 to 2022 TOYOTA RAV4 PRIME
- 2023 TOYOTA SEQUOIA HYBRID
- 2021 to 2023 TOYOTA SIENNA HYBRID
- 2022 to 2023 TOYOTA TUNDRA HYBRID
- 2021 to 2023 TOYOTA VENZA HYBRID

## Recalls for the same vehicles and component

- [25V595000](/recalls/nhtsa/25V595000.md), 2025-09-11: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [2023382](/recalls/tc/2023382.md), 2023-07-12: Electrical
- [23V478000](/recalls/nhtsa/23V478000.md), 2023-07-12: ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER
- [23V111000](/recalls/nhtsa/23V111000.md), 2023-02-22: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [23V041000](/recalls/nhtsa/23V041000.md), 2023-02-02: ELECTRICAL SYSTEM:PROPULSION SYSTEM:HYBRID MANAGEMENT:POWER CONTROL UNIT/MODULE \(HPCU\)
- [22V501000](/recalls/nhtsa/22V501000.md), 2022-07-13: BACK OVER PREVENTION:DISPLAY FUNCTION; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SOFTWARE
- [22V285000](/recalls/nhtsa/22V285000.md), 2022-04-28: BACK OVER PREVENTION:DISPLAY FUNCTION; ELECTRICAL SYSTEM:SOFTWARE
- [2021723](/recalls/tc/2021723.md), 2021-11-24: Electrical
- [2020284](/recalls/tc/2020284.md), 2020-06-25: Electrical
- [19V876000](/recalls/nhtsa/19V876000.md), 2019-12-11: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

## Other bulletins for the same vehicles and component

- [26TC02](/bulletins/11034825.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 26TC02 REPROGRAMMING FOR PARKING ASSIST ECU CERTAIN 2023 \- 2024 SEQUOIA
- [26TC02](/bulletins/11034824.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 26TC02 REPROGRAMMING FOR PARKING ASSIST ECU CERTAIN 2022 \- 2024 TUNDRA / TUNDRA HYBRID
- [22TE09](/bulletins/11033412.md), 2026-06-04, Warranty extension: ELECTRICAL SYSTEM. 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 36,000 miles \(whichever comes first\), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator. Excessive corrosion can cause AM Radio Static during certain drive cycles, or the vehicle may not start.
- [T\-SB\-0029\-26](/bulletins/11032486.md), 2026-05-08, Over\-the\-air update: ELECTRICAL SYSTEM. A new head unit software update is available for 2023 – 2024 model year RAV4, RAV4 Hybrid, and RAV4 Prime vehicles equipped with Toyota Multimedia \(earlier than version 1861\). This software update includes the following improvements: • Usability of CarPlay® exit. • User Profile. • User interface. • Cloud navigation. • Intelligent assistant voice recognition. • Bug fixes.
- [26TC02](/bulletins/11031162.md), 2026-04-08, Service campaign: ELECTRICAL SYSTEM. SPECIAL SERVICE CAMPAIGN 26TC02 Certain 2023\-2024 Model Year Sequoia HV Certain 2022 – 2023 Model Year Tundra \& Tundra HV Trailer Back Up Guide Feature Inoperative Frequently Asked Questions
- [26TC02](/bulletins/11031161.md), 2026-04-08, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 26TC02 REPROGRAMMING FOR PARKING ASSIST ECU CERTAIN 2023 \- 2024 SEQUOIA
- [26TC02](/bulletins/11031160.md), 2026-04-08, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 26TC02 REPROGRAMMING FOR PARKING ASSIST ECU CERTAIN 2022 \- 2024 TUNDRA / TUNDRA HYBRID
- [26TC02](/bulletins/11031159.md), 2026-04-08, Service campaign: ELECTRICAL SYSTEM. After calibrating a trailer and using the Trailer Backup Guide feature, subsequent use of this feature may result in a “Trailer not detected” message or a blank multimedia display that prevents the display of features such as the backup camera. The multimedia system returns to normal if the vehicle is turned off and on again with no trailer attached.
- [T\-SB\-0021\-26](/bulletins/11031158.md), 2026-04-08, Service bulletin: ELECTRICAL SYSTEM. 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 to reduce the possibility of this condition.
- [T\-SB\-0106\-22 Rev2](/bulletins/11028726.md), 2026-02-11, Service bulletin: ELECTRICAL SYSTEM. OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T\-SB\-0001\-26.

JSON: [/v1/bulletins/10247796](/v1/bulletins/10247796)

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