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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10252251
Published by NHTSA2024-04-01
Manufacturer's numberTSB010421
Manufacturer's date2024-02-15
NHTSA componentSERVICE 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

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

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

Trouble codes named

P0520, P0524

Vehicles listed
TOYOTA AVALON2019, 2020, 2021, 2022
TOYOTA AVALON HYBRID2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA CAMRY2018, 2019, 2020, 2021, 2022, 2023, 2024
TOYOTA CAMRY HYBRID2019, 2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA COROLLA2020, 2021, 2022, 2023, 2024
TOYOTA COROLLA CROSS2022, 2023, 2024
TOYOTA COROLLA CROSS HYBRID2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA COROLLA HATCHBACK2019, 2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA COROLLA HYBRID2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA CROWN2023, 2024
TOYOTA GRAND HIGHLANDER2024
TOYOTA GRAND HIGHLANDER HYBRID2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA HIGHLANDER2020, 2021, 2022, 2023, 2024
TOYOTA HIGHLANDER HYBRID2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA PRIUS2023, 2024
TOYOTA PRIUS PRIME2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV42019, 2020, 2021, 2022, 2023, 2024
TOYOTA RAV4 HYBRID2019, 2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV4 PRIME2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA SEQUOIA HYBRID2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA SIENNA HYBRID2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA VENZA HYBRID2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
T-SB-0017-232023-05-15. Service bulletin. 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-0007-222022-03-14. Service bulletin. 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-0628-202020-11-30. Service bulletin. TT: HVAC drain tube is found to be blocked/clogged.
T-SB-0103-202020-11-30. Service bulletin. 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-0621-202020-09-14. Service bulletin. 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-0074-202020-09-14. Service bulletin. 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-0074-202020-09-14. Service bulletin. 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 Rev2020-08-17. Service bulletin. TT: HVAC drain tube is found to be blocked/clogged.
T-TT-0432-17_Rev2018-04-02. Service bulletin. 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.