Technical Description of OBD-II Trouble Code
Bank 2 has an Open Circuit in the Intake Manifold Runner Control
What does that mean?
The OBD trouble code P2011 is a generic powertrain code that applies to all vehicles manufactured from 1996 onwards (Ford, VW, Audi, GM, etc.). Although it is a generic code, the specific causes may vary slightly between different brands and engine types.
It is important to consult a vehicle-specific service manual for the correct diagnostic sequence and reference numbers.
This code indicates a fault in a set of air control flaps located inside the intake manifold. These flaps are designed to create turbulence within the manifold, resulting in a swirling effect.
By creating a swirling motion in the intake air, the pulsations caused by the opening and closing of the intake valve are minimized, leading to improved air-fuel mixture quality. This improves low-end torque and reduces the formation of Nox emissions.
The electronic control module (ECM) controls the position of the swirl flaps using an intake manifold runner control solenoid valve. The ECM determines the position of the flaps based on signals from the mass air flow sensor (MAF) and the barometric pressure sensor. Pulse width modulation is used to control the intake runner control solenoid.
There are several possible reasons for this fault to occur, but the most concerning are issues with the swirl flaps themselves. Since they are located inside the intake manifold, if they fail, parts can fall into the engine, causing significant damage.
Once it has been determined that the swirl flaps are not the problem, the level of concern decreases. Some vehicles have a history of swirl flap failure, where the screws retaining the flaps can fall out if the flap fails. These screws can enter the engine and cause major damage. This engine code is similar to P2008, but P2011 is specific to Bank 2, which is the side of the engine that does not contain cylinder #1.
Symptoms
Symptoms of a P2011 DTC may include:
This is a “soft” code, meaning the check engine light may blink on and off only when the ECM detects the fault. If the fault corrects itself, the light will turn off. Hard codes will remain until they are erased.
Potential Causes
Possible causes for this DTC may include:
Diagnosis & Repair
To diagnose and repair this issue, a service manual for the vehicle and a scan tool will be necessary. The ECM uses pulse width modulation to control the position of the swirl flaps through the intake runner solenoid.
