Possible causes

– Dirty Oil
– Low engine oil level
– Valve Timing Control (VTC) open or shorted circuit.
– Valve Timing Control (VTC) electrical connector
– Faulty Valve Timing Control (VTC)
– Damaged ECM

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of power
– Engine rough idle

P0011 HONDA Description

The Engine Control Module (ECM) optimizes the valve timing using the Valve Timing Control (VTC). The ECM sends a target duty cycle control signal to the VTC. This control signal regulates the oil pressure supplied to the VTC. The VTC can advance or retard the engine timing.