2009 VW Tiguan P2015 to P2008 Code: Intake Manifold Runner Control Circuit/Open Fix and Diagnosis
Hello, I own a 2009 Volkswagen Tiguan with over 50,000 kilometers. Recently, my vehicle has been experiencing recurring engine issues, including the MIL (Malfunction Indicator Lamp) illumination and intermittent rough idling. After initial diagnostics, I received the P2015 code, followed by an EPC warning light and irregular engine performance. Upon inspection, it was found that the PCV check valve and oil separator were malfunctioning, allowing engine oil to enter the intake manifold and resulting in significant hard carbon deposits. I replaced both the PCV assembly and the entire intake manifold with its associated sensors. After thorough cleaning and reassembly, the engine runs smoothly, and the MIL has turned off. However, a new OBD2 scan revealed the P2008 code: 'Intake Manifold Runner Control Circuit/Open'. I'm unsure what this means — specifically, what does 'circuit/open' indicate? Is it related to wiring, sensor failure, or an electrical short? What steps should I take to resolve this issue permanently and remove the P2008 code? Any guidance on how to prevent recurrence would be greatly appreciated. Thanks, Schaye
Volkswagen vehicles, especially older models like the 2009 Tiguan, are known for potential issues with their engine control modules (ECM). A 'circuit/open' fault typically means the system is not receiving a signal from the ECM, or there's a wiring issue such as an open circuit to power or ground. To diagnose this, you should measure resistance on each wire in the intake manifold runner control circuit using a multimeter. Check for continuity and ensure no breaks or high resistance points exist. Proper electrical testing will help identify whether it's a wiring fault or a sensor problem. Good luck with your diagnosis.