Fault code P0011 – a step-by-step guide to diagnosing and fixing it

P0011 refers to a fault in the variable valve timing (VVT) system. It indicates that the engine control module (ECM) has detected that the camshaft timing in cylinder bank 1 is more advanced than it is supposed to be.

The control unit adjusts the timing based on a range of factors and data transmitted by the engine’s sensors. This calculated adjustment enhances the car’s performance while increasing fuel efficiency. If something goes wrong, the vehicle can become much more difficult to drive.

• Blocked phaser passages or low oil levels. This can occur when the engine oil filter is bad, the oil is too old or the viscosity of the lubricant is unsuitable, as well as due to wear and tear. Without the right oil pressure, the phasers cannot turn the camshaft properly.
• A phaser which is stuck in the advanced position. This can occur when the seals are damaged and water and dirt can pass through.
• Worn or damaged phaser parts. The lobes or vanes wear more quickly when they aren’t lubricated properly.
• Faulty sensors. The car camshaft and crankshaft sensors could have sent false information about the timing due to electrical faults such as broken wires and connectors.
• A failed valve control solenoid. For example, this could be due to a poor connection, oxidation, or damage to the cables.
• Worn timing components such as the gears or belt

• The engine is hard to start
• A loss of engine power, frequent stalling and rough idling
• Increased fuel consumption and emissions
• The check engine light comes on
• An increase in carbon deposits on the spark plugs

• Connect an OBD2 scanner to the vehicle to scan the system for error codes. Decipher the DTCs to quickly determine the possible causes of the fault. Reset them and take the vehicle for a test drive to see whether the check engine light is activated again.
• Inspect the car engine oil in the reservoir. You can check how much is in there using a dipstick. Top it up if necessary. Is the oil unusually dark and gritty? It could be time for an oil change.
• Examine the electrical connectors and wires. Replace the components with visible signs of damage and clean oxidised contact with a specialised spray to improve the conductivity.
• Remove the position sensors and clean the surfaces of them with a solvent before reinstalling. You can check whether they are functioning properly by measuring the voltage with a multimeter. The solenoid valve can also be tested by measuring the voltage output. These devices are relatively inexpensive to replace.
• Make sure that the tension of the timing belt or chain is correct.