P0338 CHEVROLET - Crankshaft Position Sensor Circuit High Duty Cycle
When is the code detected?The crankshaft position sensor (POS) signal is not detected by the Powertrain Control Module (PCM) during the first few seconds of engine cranking
P0338 Chevrolet DescriptionThe Crankshaft Position Sensor (CKP) also known as the crank position sensor is an electronic device used in an engine to record the rate at which the crankshaft is spinning. This information is used by the Powertrain Control Module (PCM) to control ignition and fuel injection. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.