# Service bulletin TSB010421

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: 10252251
- Published by NHTSA: 2024\-04\-01
- Manufacturer's number: TSB010421
- Manufacturer's date: 2024\-02\-15
- NHTSA component: SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:COOLING SYSTEM; LANE DEPARTURE

## NHTSA's summary

TSB: Some 2018 ? 2024 model year Toyota vehicles equipped with an A25A\-FKS, A25A\-FXS, M20A\-FKS, or M20A\-FXS engine may exhibit one or more of the following conditions: ?Milky/discolored engine oil. ?An ?Oil Pressure Low? warning message on the Multi\-information Display \(MID\). ?A MIL ON condition with Diagnostic Trouble Codes \(DTCs\) P05202A \(Engine Oil Pressure Sensor/Switch ?A? Signal Stuck in Range\) and/or P052477 \(Engine Oil Pressure Too Low \[Severe\]\) present. Moisture from blow\-by gases condenses and accumulates in the engine oil during short trips in extreme cold weather. When the moisture in the oil freezes, the oil pressure may drop, and the aforementioned warning indicators may display. Follow the procedures in this bulletin to address these conditions.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10252251-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10252251-9999.pdf)

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

## Components

Brakes, Driver assistance, Electrical system, Engine, Cooling system

## Trouble codes named

P0520, P0524

## Vehicles listed

- 2019 to 2022 TOYOTA AVALON
- 2019 to 2022 TOYOTA AVALON HYBRID
- 2018 to 2024 TOYOTA CAMRY
- 2019 to 2024 TOYOTA CAMRY HYBRID
- 2020 to 2024 TOYOTA COROLLA
- 2022 to 2024 TOYOTA COROLLA CROSS
- 2023 to 2024 TOYOTA COROLLA CROSS HYBRID
- 2019 to 2024 TOYOTA COROLLA HATCHBACK
- 2020 to 2024 TOYOTA COROLLA HYBRID
- 2023 to 2024 TOYOTA CROWN
- 2024 TOYOTA GRAND HIGHLANDER
- 2024 TOYOTA GRAND HIGHLANDER HYBRID
- 2020 to 2024 TOYOTA HIGHLANDER
- 2020 to 2024 TOYOTA HIGHLANDER HYBRID
- 2023 to 2024 TOYOTA PRIUS
- 2023 to 2024 TOYOTA PRIUS PRIME
- 2019 to 2024 TOYOTA RAV4
- 2019 to 2024 TOYOTA RAV4 HYBRID
- 2021 to 2024 TOYOTA RAV4 PRIME
- 2023 to 2024 TOYOTA SEQUOIA HYBRID
- 2021 to 2024 TOYOTA SIENNA HYBRID
- 2021 to 2024 TOYOTA VENZA HYBRID

## Other bulletins for the same vehicles and component

- [T\-SB\-0017\-23](/bulletins/10236198.md), 2023-05-15, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY; UNKNOWN OR OTHER. TSB: Some 2018 ? 2020 model year Camry Hybrid and 2019 ? 2020 model year Avalon Hybrid vehicles equipped with a A25A\-FXS engine may exhibit a MIL ON condition with Diagnostic Trouble Code \(DTC\) P05A074 \(Active Grill Air Shutter ?A? Actuator Slipping\). To address these concerns an updated radiator shutter sub\-assembly was developed
- [T\-SB\-0007\-22](/bulletins/10209001.md), 2022-03-14, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. TSB: Some 2020 ? 2021 model year TMMC and TMMK built RAV4 and RAV4 Hybrid vehicles may exhibit damp carpeting in the front floor area. This may be due a condition in which the inside of the HVAC drain cooler hose is obstructed with plastic. Follow the Repair Procedure in this bulletin to address this condition
- [T\-TT\-0628\-20](/bulletins/10183281.md), 2020-11-30, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. TT: HVAC drain tube is found to be blocked/clogged.
- [T\-SB\-0103\-20](/bulletins/10183188.md), 2020-11-30, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP; EQUIPMENT. TSB: This Service Bulletin provides updated non\-electric water pump leak inspection and diagnostic tips for some 2008 ? 2021 model year Toyota vehicles.
- [T\-TT\-0621\-20](/bulletins/10179791.md), 2020-09-14, Service bulletin: EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. TT: Any HVAC repair requiring reassembly of the quick connect fitting between the suction hose sub\-assembly and the suction pipe sub\-assembly located at the top right of the engine compartment.
- [T\-SB\-0074\-20](/bulletins/10179698.md), 2020-09-14, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN; EQUIPMENT; ELECTRICAL SYSTEM. TSB: Some 2003 ? 2020 model year Prius, Prius C, Prius V; 2006 ? 2019 model year Highlander Hybrid Vehicle; 2007 ? 2020 Camry Hybrid Vehicle; 2013 ? 2020 model year Avalon Hybrid Vehicle; 2016 ? 2020 model year Mirai and RAV4 Hybrid Vehicle; and 2020 model year Corolla Hybrid Vehicles may exhibit a MIL ON condition with Diagnostic Trouble Codes \(DTCs\) P0A80/P1AC000 and/or P0A7F/P1A8000 stored due to dust or debris buildup in the HV battery cooling fan and/or HV cooling filter. Follow the procedure in this bulletin to address this condition.
- [T\-SB\-0074\-20](/bulletins/10179602.md), 2020-09-14, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. TSB: Some 2003 ? 2020 model year Prius, Prius C, Prius V; 2006 ? 2019 model year Highlander Hybrid Vehicle; 2007 ? 2020 Camry Hybrid Vehicle; 2013 ? 2020 model year Avalon Hybrid Vehicle; 2016 ? 2020 model year Mirai and RAV4 Hybrid Vehicle; and 2020 model year Corolla Hybrid Vehicles may exhibit a MIL ON condition with Diagnostic Trouble Codes \(DTCs\) P0A80/P1AC000 and/or P0A7F/P1A8000 stored due to dust or debris buildup in the HV battery cooling fan and/or HV cooling filter. Follow the procedure in this bulletin to address this condition.
- [T\-TT\-0468\-17 Rev](/bulletins/10178524.md), 2020-08-17, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM. TT: HVAC drain tube is found to be blocked/clogged.
- [T\-TT\-0432\-17\_Rev](/bulletins/10131893.md), 2018-04-02, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM. TT: Rev2 Some Customers may complain about a Hybrid Vehicle Battery cooling system warning message. This warning message may appear when the HV Battery cooling system loses efficiency due to debris on the filter and or some object obstructing the air inlet. Refer to the information below to address this issue.

JSON: [/v1/bulletins/10252251](/v1/bulletins/10252251)

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