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Technical Description of OBD-II Trouble Code
The circuit controlling the intake manifold runner is open in Bank 1.
What does that mean?
The OBD trouble code P2008 is a generic powertrain code that applies to all vehicles manufactured from 1996 onwards (Ford, VW, Audi, GM, etc.).
While this code is generic, the specific causes may vary 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, which receives signals from the mass air flow sensor (MAF) and the barometric pressure sensor. The ECM uses pulse width modulation to control the intake runner control solenoid and determine the position of the swirl flaps.
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 and be sucked 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 holding the flaps in place can fall out if the flap fails. These screws can enter the engine and cause major damage. This engine code is similar to P2011, but P2011 is for Bank 2, while this DTC is for Bank 1. Bank 1 refers to the side of the engine that contains cylinder #1.
Symptoms
Symptoms of a P2008 DTC may include:
This is considered 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, on the other hand, 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 specific 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.
Note: It is important to also check for any relevant Technical Service Bulletins (TSBs), as there may be a known TSB for certain Audi vehicles that involves reprogramming the ECM to resolve this issue.
Professional Service
We always recommend seeking professional mechanical assistance to resolve this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to function normally. If you are interested in this option, please upload your ECU file to our portal.
