2002 Land Rover Discovery II OBD2 Code P3401 Cylinder 1 Deactivation/Intake Valve Control Circuit/Open

OBD II Fault Code

• OBD II P3401

OBD-II Code Decreased engine performance is defined as a Cylinder 1 Deactivation/Intake Valve Control Circuit/Open

In an effort to meet fuel and emissions standards, many manufacturers are utilizing cylinder deactivation systems. This system allows the engine's control module (PCM) to disable select cylinders when additional power is not needed from the engine, such as at idle or when cruising on the highway. If the engine's control module (PCM) determines that the Intake Valve for cylinder number one is not Turning on or off the way it is being commanded, the PCM will set code P3401.

Decreased engine performance Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P3401 Code

• Engine oil level is too low
• Powertrain Control Module (PCM) failure
• Variable valve timing solenoid failure
• Wiring issue