P0011 on Acura: How to Diagnose & Fix
Intake Camshaft Position Timing - Over-Advanced (Bank 1)
2 Acura models · 2 documented issues · 1 critical · $500-$2,200 repair
P0011 on Acura by model: symptoms, diagnosis and fix
On the 2.4L K24 ILX, the variable timing control (VTC) actuator on the intake camshaft is not fully oil-pressurized at first start. The internal locking pin fails to hold the actuator against the sprocket, so for one to two seconds after a cold start the actuator rattles loudly against its stops - a hard metallic grinding or 'bag of bolts' sound from the front of the engine that disappears once oil pressure builds. It is worst in cold weather, after the car has sat overnight, and with stretched oil-change intervals. This is an all-K24-family pattern documented from roughly 2008 onward across Honda and Acura four-cylinders and it carries into the ILX's 2.4. It does NOT apply to the 2.0L R20 or the 1.5L hybrid, which use a different valvetrain, and merging it into a generic 'ILX engine noise' issue is the classic mistake on this nameplate.
Common Symptoms
- Loud metallic rattle for 1-2 seconds on cold start
- Noise worse in cold weather
- Rattle disappears once oil pressure builds
- Noise returns after the car sits overnight
- Check engine light with cam timing codes in advanced cases
How to Fix
Replace the VTC actuator with the updated revised-design part (Honda addressed the original design with a superseded actuator part number). The job requires removing the valve cover and gaining timing-chain cover access; budget roughly $500-$1,000 at an independent shop. The noise itself is not immediately destructive, but a failing actuator can eventually set cam timing correlation codes. Interim mitigation: use the correct 0W-20 grade, keep oil changes to 5,000 miles, and verify the level - low or degraded oil sharply worsens the rattle.
Sources for this issue (3)
On the second-generation 2.4L K24Z3 the timing chain and its hydraulic tensioner wear enough for the exhaust cam to fall out of correlation with the crankshaft, setting P0017 (Crankshaft Position - Camshaft Position Correlation, Bank 1 Sensor B). This is the downstream consequence of the same wear pattern that produces the VTC rattle, and the two are routinely repaired together. The K24 is an interference design, so a chain that jumps a tooth under load can put valves into pistons. Owners typically report the cold-start rattle first, then a check engine light and rough running months later - the code is the point at which the repair is no longer optional.
Common Symptoms
- Check engine light with P0017
- Cold start rattle preceding the code
- Rough idle or misfire
- Reduced power
- Rattling from the timing cover area under load
How to Fix
Replace the timing chain, chain tensioner and guides as a set, plus the VTC actuator, and verify cam timing marks on reassembly. Check for a clogged oil screen or degraded oil first, since low oil pressure to the tensioner accelerates the wear. Do not clear the code and drive: on an interference engine a jumped chain is a bent-valve repair. No recall covers this repair. Owners who catch the rattle early and replace the actuator and chain avoid the far larger bill.
Sources for this issue (3)
P0011 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0011 mean on a Acura?
P0011 stands for "Intake Camshaft Position Timing - Over-Advanced (Bank 1)." P0011 means the engine computer detected that the intake camshaft timing on Bank 1 is more advanced than it should be — the variable valve timing system is either over-advancing the cam or not responding correctly to commands. Modern engines use a camshaft actuator, controlled by an oil-fed solenoid, to vary valve timing for better power and efficiency. When the actual cam position stays more advanced than the computer commands (or won't move back), this code is set. It generally indicates a fault in the variable valve timing system and can cause rough idle, reduced performance, or poor fuel economy. On Acura it is documented across 2 models: ILX, TSX.
What are the most common causes of P0011?
The most common causes of P0011 are: Stuck or faulty camshaft (VVT) oil control valve / solenoid, Low or dirty engine oil restricting actuator movement, Clogged oil control valve screen or oil passages, Faulty camshaft phaser / actuator stuck advanced, Wrong oil viscosity or overdue oil change, Wiring or connector fault to the VVT solenoid, Faulty camshaft position sensor. The specific cause varies by vehicle.
How much does it cost to fix P0011 on a Acura?
Published repair estimates on Acura range from $500 to $2,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0011 on a different make?
View P0011 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.