P0011 “Camshaft Position A – Timing Over-Advanced or System Performance (Bank 1)”
What is code P0011?
Code P0011 stands for “Camshaft Position A – Timing Over-Advanced or System Performance (Bank 1)”. This diagnostic trouble code can happen for a number of reasons related to the intake camshaft(s) inside your engine. Therefore, it is important to have a qualified technician diagnose the specific problem that caused the code to be stored in your vehicle’s computer.
Get this checked out soon by a CarAdvise shop, where the work will be guaranteed, and one of our expert techs will review any repair orders.
What does code P0011 mean?
When a diagnostic scan of your vehicle indicates a code P0011, a technician understands that there is something going on with your camshaft timing. The camshaft is responsible for opening and closing each of the intake and exhaust valves in your engine – up to thirty two of them – at precisely the right time for your engine to run properly.
Driven by a timing belt or chain, the camshaft ensures that air and fuel enter the engine and exhaust gases escape. In order for your engine to run efficiently, or at all for that matter, the camshaft(s) must rotate at the correct speed and at the proper time in relation to other events, including the rotation of the crankshaft.
On single overhead cam (SOHC) engines, a camshaft actuates both the intake and exhaust valves. But in a dual overhead cam (DOHC) engine, there is a separate camshaft for the intake and exhaust functions. Code P0011 relates to the intake camshaft.
Because the timing of the camshaft is so critical, auto manufacturers have placed sensors inside the engine to monitor the camshaft(s) and their exact position and speed at all times. The data from the sensors is transmitted to the vehicle’s ECM (engine control module). If the ECM detects abnormal timing or speed of the camshaft, and that it is operating “too early” in relation to the engine crankshaft, it may store code P0011 and turn on the check engine light.
What causes code P0011?
A number of causes can trigger a code P0011. That is why an accurate diagnosis is essential. Causes of a code P0011 include:
Most likely
- Faulty camshaft position sensor ($180-$370)
- Faulty camshaft VVT actuator ($100-$250)
Other possibilities
- Engine oil weight not within manufacturer’s specifications
- Faulty wiring to the camshaft position sensor or camshaft VVT actuator
- Worn timing chain or belt tensioner
- Loose or worn timing chain or belt
- Low oil pressure or level
- Oil sludge buildup inside engine
What symptoms are associated with this code?
Common signs associated with a code P0011 include the following:
- The check engine light is on or is flashing
- Reduction in fuel economy
- Your vehicle fails emissions testing
- The engine shakes or runs roughly
- Your engine lacks power
- Engine stalling
- A metal clicking, rattling, or dragging noise coming from the engine bay
- Small bits of metal or plastic are found in the engine oil
How does a technician diagnose code P0011?
If a diagnostic scan of your vehicle indicates a code P0011, a technician will perform tests to pinpoint the problem. These tests include checking for any related trouble codes. The technician will also use the scan tool to read the live data of the camshaft position sensors during a variety of operating conditions and ensure the data makes sense and is consistent. If available on that vehicle, a camshaft VVT actuator test may be run on the diagnostic tool. The technician may also insert a tiny camera into the engine without disassembling it, in order to inspect the timing chain and tensioner for severe wear.
How serious is this code?
In some cases, a code P0011 might not cause noticeable changes to how your vehicle performs. However, ignoring the check engine light can lead to significant problems and sometimes catastrophic engine failure. This code in particular can signal something as small as a poor connection in a wire, or as bad as a timing chain component that is failing. Without knowing exactly what is causing the code, the vehicle should not be driven or even started up more than absolutely necessary.
Get this checked out soon by a CarAdvise shop, where the work will be guaranteed, and one of our expert techs will review any repair orders.
Related Diagnostic Trouble Codes
P0012 “Camshaft Position A – Timing Over-Retarded or System Performance (Bank 1)”
P0014 “Camshaft Position B – Timing Over-Advanced or System Performance (Bank 1)”
P0015 “Camshaft Position B – Timing Over-Retarded or System Performance (Bank 1)”
