P0011 – Intake camshaft timing over-advanced (bank 1)

A camshaft position (bank1). Timing over-advanced or system performance.

 

 

The P0011 diagnostic trouble code indicates incorrect camshaft timing. Specifically, the “A” camshaft, which controls the intake valves, opens them too early.  

 

 

In engine configurations, such as V-shaped, W-shaped, or flat, the cylinders are grouped into “banks.” Bank 1 refers to the side of the engine containing the first cylinder. While the location of the first cylinder depends on the engine’s design and manufacturer, it’s typically closest to the front of the engine near the drive belt.  

 

 

Code P0011 often indicates problems with the variable valve timing (VVT) system, which optimizes engine performance by adjusting timing when the valves open and close. It could also mean a faulty camshaft or crankshaft position sensor, low oil pressure, or wiring issues. 

 

This fault code is closely related to P0014, which indicates that the exhaust valves are opening too early. These codes often occur together. 

 

 

 

Most internal combustion engines operate using a four-stroke cycle: 

The image below shows what each of these strokes looks like from the inside. Here you can see how the camshafts control the valves while the crankshaft moves the piston: 

 

 

If the intake valve opens too early during the exhaust stroke, burned gases may re-enter the intake manifold instead of being expelled. This reduces engine efficiency, increases emissions, and can lead to long-term damage. 

 

 

P0011 isn’t something to ignore. This code can sometimes signal a minor problem, such as a corroded connector, but it can also be a major issue, such as a stuck VVT system or low oil pressure. If you catch it early, it's usually an inexpensive fix, but waiting too long can be risky – especially if your car has an interference engine. 

 

In interference engines, the pistons and valves share the same space at different times. However, if the timing is off, the pistons and valves can collide, causing catastrophic damage to the engine. 

 

Moreover, when burned gases re-enter the intake manifold, the intake temperature rises. High intake air temperature can lead to engine detonation or pre-ignition, which may cause significant damage to the engine's internal components. 

 

By diagnosing this problem in time, you can save thousands on repairs and avoid getting stranded on the side of the road. 

 

 

 

 

Technically, yes – but it’s not recommended. Driving with the P0011 code can result in poor engine performance, reduced acceleration, rough idle, and poor fuel economy. These problems make driving unpleasant and unsafe, especially when merging onto highways or navigating heavy traffic.  

 

This code can also trigger limp mode, a safety feature that limits engine performance to prevent further damage. While limp mode helps you reach a repair shop, you shouldn’t rely on it for long drives or daily use. 

 

 

Watch for these warning signs:  

 

 

Code P0011 appears due to:

 

 

Use these tips to accurately diagnose and fix a P0011 trouble code: 

 

 

First, use your scan tool to clear the P0011 fault code from your car.  

After the test drive, perform another scan to see if the code reappears. If it does, this confirms the problem persists and requires further investigation. 

 

 

 

 

A low engine oil level or contamination is a primary cause of the P0011 code. Since changing the engine oil is quite simple, it's the best place to start before looking into bigger repairs. 

 

Here's how to do that: 

 

Sometimes, the camshaft variable timing solenoid can get stuck and fail to adjust the valve timing according to driving conditions. To inspect it, you'll need these tools:  

 

Follow these steps: