The P0012 error code on your Ford indicates a malfunction with the "A" camshaft timing, specifically, it is over-retarded. When the P0012 error code is shown, the check engine light will also be illuminated.
Which camshaft is the "A" camshaft varies depending on the vehicle. It can be the intake, front or left camshaft on your Ford. An error in timing with this camshaft will lead to hard starts, poor idling and possibly stalling of the vehicle.
An over-retarded camshaft is caused by a non-functioning variable camshaft timing solenoid. In addition to this solenoid being inoperable, this error code on your Ford could be caused by an issue with the variable camshaft timing solenoid wiring, continuous flow of oil to the variable camshaft timing piston chamber, or a valve control solenoid that is stuck open.
It is important to verify that the variable camshaft timing solenoid is not in operation before replacing it. If an obviously stuck solenoid valve is not seen during inspection, allow a Ford dealership or other Ford-specialized mechanic to check the unit. They have access to advanced tools to check and diagnose any problems within the powertrain of your Ford.
