Does the P0017 trouble code indicate a skipped tooth?
2 Answers
Fault code P0017 refers to an unreasonable correlation between the crankshaft position and the exhaust camshaft position. There are multiple causes for the P0017 trouble code, with a skipped tooth being just one of them. Not every occurrence of the P0017 fault code is caused by a skipped tooth. The main causes of the P0017 fault code can be categorized into the following six types. 1. Oil pressure and oil quality: A malfunctioning or clogged oil pump, or blocked oil passages, can lead to abnormal oil pressure, preventing the VVT actuator from establishing the ideal oil pressure, thereby causing the P0017 fault. In such cases, an oil pressure gauge should be used to measure the oil pressure, or the oil pan should be removed to check if the filter screen is clogged. If these components are functioning normally, the focus should shift to inspecting whether the engine oil passages are blocked, followed by repairs based on the specific fault condition. Oil quality issues mainly arise when substandard lubricants are used, such as replacing the engine's required low-viscosity oil with a high-viscosity oil, which can also trigger the P0017 fault. The solution is to replace the oil with one suitable for the engine. 2. VVT solenoid valve sticking: VVT stands for variable valve timing technology, which adjusts the overlap time and timing of the engine's intake and exhaust systems to enhance power and fuel economy. The VVT solenoid valve, as a critical component of this system, works directly with the VVT actuator. If the oil is dirty and clogs the VVT filter screen, or if the solenoid valve itself is damaged or stuck, it can cause misalignment in the timing system. The remedy involves removing the VVT solenoid valve for cleaning or replacing it with a new one. 3. VVT actuator failure: The VVT actuator, also known as the variable timing wheel, alters the camshaft's angle through oil pressure. If the VVT actuator is internally fractured or the oil chamber loses pressure, it will either stop working or function abnormally. Since the actuator is irreparable, it must be replaced with a new one. 4. Chain skipped tooth or tensioner pressure loss: Due to the material used in timing chains, they can experience metal fatigue after a certain period or mileage, leading to elongation and incorrect ignition timing. The solution is to replace the timing chain. The tensioner, which controls the chain's tightness, is driven by oil pressure. If the tensioner loses pressure, the chain will loosen, resulting in the P0017 fault. Replacing the tensioner resolves this issue. 5. Camshaft and crankshaft position sensor and signal disc failure: The angles of the crankshaft and camshaft are typically detected by the crankshaft position sensor and camshaft position sensor. A malfunction in either sensor can cause the P0017 fault code. The solution involves checking whether the sensors or signal discs are dirty, inspecting the wiring for faults, and performing repairs based on the findings. 6. ECU damage: The ECU, or engine control unit, processes signals from sensors and sends commands to control the actuators. If the ECU malfunctions, it may issue incorrect commands, leading to the P0017 fault. The solution is to repair or replace the engine control unit.
I often encounter fellow car enthusiasts asking about the P0017 trouble code, which indicates a misalignment between the crankshaft and camshaft positions. Indeed, this is often due to the timing chain skipping a tooth—wear or looseness in the chain can cause gear misalignment. However, it could also be other reasons, such as a faulty sensor or unstable oil pressure affecting signal transmission. If the chain skips a tooth, the engine may shake, have poor acceleration, or even experience a surge in fuel consumption; if it's a sensor issue, replacing it usually helps. I must remind everyone not to ignore it, as prolonged neglect can damage internal engine components. It's best to quickly visit an auto repair shop to diagnose with professional tools whether it's a skipped tooth or another issue. Regular maintenance, like ensuring proper chain lubrication, can prevent this, and maintaining the chain's lifespan can save a lot of money.
