2021-2024 Toyota Engine Oil Pressure Warning & Milky Oil TSB
A Toyota Technical Service Bulletin (TSB) addresses engine oil pressure warnings and milky/discolored engine oil in certain 2021-2024 Toyota vehicles. This condition is often observed during short trips in extreme cold weather, leading to potential Diagnostic Trouble Codes (DTCs) P05202A and…
Sarah Mitchell2024 Toyota Camry
Also applies to
- Toyota Avalon
- 2021–2022
- Toyota Camry
- 2021–2023
- Toyota Corolla
- 2021–2024
- Toyota Corolla Cross
- 2022–2024
- Toyota Crown
- 2023–2024
- Toyota Grand Highlander
- 2024
- Toyota Highlander
- 2021–2024
- Toyota Prius
- 2023–2024
- Toyota RAV4
- 2021–2024
- Toyota Venza
- 2021–2024
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Symptoms
Owners of certain 2021-2024 Toyota vehicles may notice one or more of the following issues, especially during cold weather and short driving trips:
- The engine oil appears milky or discolored.
- An "Oil Pressure Low" warning message is displayed on the Multi-information Display (MID).
- The Malfunction Indicator Lamp (MIL), also known as the Check Engine Light, illuminates.
These symptoms are typically linked to a drop in oil pressure caused by frozen moisture within the engine oil.
Fault Codes / DTCs
When the MIL is illuminated, technicians may find specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's system. These codes indicate issues related to engine oil pressure:
| Code | Description |
|---|---|
| P05202A | Engine Oil Pressure Sensor/Switch 'A' Signal Stuck in Range |
| P052477 | Engine Oil Pressure Too Low [Severe] |
Diagnosis / Trigger Conditions
The root cause of these conditions is moisture accumulation in the engine oil. During short trips in extremely cold weather, blow-by gases can introduce moisture into the engine oil. This moisture then condenses and, under freezing temperatures, can turn into ice. When the moisture in the oil freezes, it can lead to a drop in oil pressure, triggering the "Oil Pressure Low" warning and the associated DTCs. This issue is specifically noted for vehicles equipped with A25A-FKS, A25A-FXS, M20A-FKS, or M20A-FXS engines.
Repair Procedure Summary
Toyota has issued a Technical Service Bulletin (TSB) to address these conditions. The TSB outlines specific procedures for dealerships to diagnose and resolve the issue. While the exact steps are detailed for technicians, the general approach involves addressing the moisture accumulation and its effects on oil pressure. Owners experiencing these symptoms should not attempt DIY repairs but rather seek professional service.
Owner Action
If your 2021-2024 Toyota vehicle, particularly a 2024 TOYOTA Camry manufacturer_communication, exhibits milky engine oil, an "Oil Pressure Low" warning, or an illuminated MIL, it is recommended to contact your authorized Toyota dealership. Inform them of the symptoms you are experiencing and mention the potential for Diagnostic Trouble Codes P05202A or P052477. The dealership will be able to perform the necessary diagnostic checks and apply the repair procedures outlined in the relevant TSB to resolve the issue.
Source: NHTSA ID 10252251
Frequently Asked Questions
- What does an 'Oil Pressure Low' warning mean in my Toyota?
- An 'Oil Pressure Low' warning in your 2021-2024 Toyota, especially during cold weather, indicates that the engine's oil pressure has dropped. This can be caused by moisture freezing in the engine oil, as described in Toyota's TSB.
- Why is my Toyota's engine oil milky or discolored?
- Milky or discolored engine oil in affected Toyota models is often a sign of moisture contamination. During short drives in extreme cold, moisture from blow-by gases can condense and mix with the oil, leading to this appearance and potentially affecting oil pressure.
- What are DTCs P05202A and P052477, and how are they related to this issue?
- DTC P05202A ('Engine Oil Pressure Sensor/Switch 'A' Signal Stuck in Range') and P052477 ('Engine Oil Pressure Too Low [Severe]') are diagnostic trouble codes that indicate a problem with the engine's oil pressure system. These codes are commonly triggered when frozen moisture in the engine oil causes a significant drop in oil pressure, as identified in the 2024 TOYOTA Camry manufacturer_communication.
- Which Toyota engines are affected by this cold weather oil issue?
- This issue primarily affects Toyota vehicles equipped with A25A-FKS, A25A-FXS, M20A-FKS, or M20A-FXS engines, particularly those from the 2021-2024 model years.
Other revisions of this TSB
- 2021-2024 Toyota Low Oil Pressure DTCs P05202A P052477P05202A, P052477
- 2021-2022 Toyota Camry Oil Pressure Low Warning TSBP05202A, P052477
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