Reasons for P2015 Intake Manifold Runner Position Unbelievable Signal?
3 Answers
P2015 fault code indicates an unbelievable signal from the intake manifold runner position. Here are the specific details: 1. The cause of the fault is excessive carbon buildup in the intake manifold leading to runner sticking: Use the KT600 fault diagnostic tool to read the fault code, which is P2015. The reason for the fault is excessive carbon buildup in the intake manifold causing the runner to stick. 2. After performing the fault code clearing procedure, the fault code disappears and the exhaust emission warning light turns off: After restarting the engine, the exhaust emission warning light does not illuminate, and there are no fault codes. 3. According to the code priority principle in the diagnostic method, troubleshoot based on the fault code: Keep the engine in idle state, read the engine data stream, perform data matching, and after automatic matching is completed, recheck the data stream.
Encountering the P2015 trouble code, I suspect the issue of unreliable intake manifold runner position signal is mostly caused by a dirty or faulty position sensor. The sensor on the intake manifold detects the runner's opening degree, and over time, accumulated dust and oil can cause it to malfunction, leading to misjudgment of the position. Alternatively, the runner shaft itself might get stuck and fail to move, resulting in signals that don't match expectations. Additionally, aging or loose wiring can cause intermittent and unreliable signals, not to mention the interference from vacuum system leaks. When driving, the engine might struggle to breathe, leading to sluggish acceleration and increased fuel consumption. My previous car had this exact issue, and regularly cleaning the intake manifold as a preventive measure worked quite well. If that doesn’t help, it’s best to quickly visit a professional shop to replace the sensor or check the ECU tuning, to avoid minor issues turning into major repairs that could affect safety. These are the common causes I’ve personally experienced and summarized.
The P2015 light on the car indicates an unreliable intake manifold runner position signal, and I believe the main cause lies in the electronic system. The position sensor acts like a small detector—if it fails or the output drifts, the signal gets messed up. Short circuits or open circuits in the wiring are also common culprits—loose connectors or corroded wires can cause trouble. Malfunctions in the vacuum control module are possible too, such as motor wear or valve leaks leading to improper runner positioning. When troubleshooting yourself, first use an OBD tool to read and compare the data stream, check if any fuses are blown, and ensure connectors are secure. But don’t be too reckless—the runner components are delicate, and improper disassembly can damage the car. Other causes include engine carbon buildup, which can affect signal consistency. Early diagnosis is crucial to prevent engine surging and power loss. For safety, professional technicians recommend following their diagnostic approach.
