P0505 on Lexus vehicles The idle air control system is not holding the idle it was told to
P0505 is named on 27 Lexus model years (2016–2025): 27 manufacturer filings and 0 owner reports in NHTSA’s files, across GS, IS, LC, RC.
Which Lexus model years name P0505
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2025 Lexus IS | Engine | 1 | — |
| 2025 Lexus LC | Engine | 1 | — |
| 2025 Lexus RC | Engine | 1 | — |
| 2024 Lexus IS | Engine | 1 | — |
| 2024 Lexus LC | Engine | 1 | — |
| 2024 Lexus RC | Engine | 1 | — |
| 2023 Lexus IS | Engine | 1 | — |
| 2023 Lexus LC | Engine | 1 | — |
| 2023 Lexus RC | Engine | 1 | — |
| 2022 Lexus IS | Engine | 1 | — |
| 2022 Lexus LC | Engine | 1 | — |
| 2022 Lexus RC | Engine | 1 | — |
| 2021 Lexus LC | Engine | 1 | — |
| 2021 Lexus RC | Engine | 1 | — |
| 2020 Lexus GS | Engine | 1 | — |
| 2020 Lexus LC | Engine | 1 | — |
| 2020 Lexus RC | Engine | 1 | — |
| 2019 Lexus GS | Engine | 1 | — |
| 2019 Lexus LC | Engine | 1 | — |
| 2019 Lexus RC | Engine | 1 | — |
| 2018 Lexus GS | Engine | 1 | — |
| 2018 Lexus LC | Engine | 1 | — |
| 2018 Lexus RC | Engine | 1 | — |
| 2017 Lexus GS | Engine | 1 | — |
| 2017 Lexus RC | Engine | 1 | — |
| 2016 Lexus GS | Engine | 1 | — |
| 2016 Lexus RC | Engine | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
Lexus filings that name P0505
Source: NHTSA manufacturer communicationsBulletins and campaigns Lexus filed with NHTSA whose summary names P0505. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- L-SB-0032-25 Service bulletin2025-07-30 · Engine
- Some 2016 – 2020 model year GS F, 2008 – 2014 model year IS F, 2022 – 2025 model year IS 500, 2018 – 2025 model year LC 500, 2021 – 2025 model year LC 500c, and 2015 – 2025 model year RC F vehicles with 2UR-GSE engines may exhibit a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs): •P0505 – Idle Control System •P2111 – Throttle Actuator Control System – Stuck Op
What P0505 means
Source: SAE J2012 / OBD-IIThe idle air control system is not holding the idle it was told to.
A stored code names the test that failed, never the part that caused it. The record above is what Lexus and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0505 a known problem on Lexus vehicles?
It is a documented one: NHTSA's files hold 27 manufacturer filings and 0 owner reports naming P0505 on 27 Lexus model years (2016–2025). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Lexus models does P0505 appear on most?
2020 GS (1 document), 2019 GS (1 document), 2018 GS (1 document).
Does P0505 on a Lexus mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.