P0505 The idle air control system is not holding the idle it was told to
2 owner reports and 54 manufacturer filings across 50 model years from Jaguar, Land Rover, Lexus, Toyota.
Where P0505 shows up
Source: NHTSA manufacturer communications and complaintsShowing the 25 model years where P0505 appears most; it is on file for 50 in total.
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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P0505 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0505 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
Diagnostic Test provided: Code P0171 Stored and Permanent System is Too Lean Bank 1 Code P0505 Stored and Pending Idle Control System P117B Stored Fuel Performance/Direct Injector Most Likely Solution: Replace Fuel Pump Primary DTC: System…
54 manufacturer filings name P0505. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P0505.
- 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
- SSM74374 Service bulletin2019-04-10 · Engine
- Air leak from the right hand camshaft cover assembly due to a split diaphragm within the pressure control valve. Any of the following DTCs (indicating an air intake system leak) could be stored in the Powertrain Control Module (PCM) ? P2187, P2189, P0505, P0507.
- SSM74375 Service bulletin2019-04-10 · Engine
- Air leak from the right hand camshaft cover assembly due to a split diaphragm within the pressure control valve. Any of the following DTCs (indicating an air intake system leak) could be stored in the Powertrain Control Module (PCM) ? P2187, P2189, P0505, P0507.
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. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P0505
Source: NHTSA files and the OBD-II standardCan I keep driving with P0505 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.