2001 GMC Jimmy PO300 code

Check/clean or replace the

Crankshaft Position Sensor
The Crankshaft Position (CKP) sensor utilizes a pick-up coil type sensor mounted on side of engine block or on bottom of timing cover. The CKP sensor monitors crankshaft position and sends signals to ignition control module. These signals provide PCM with a TDC position reference for each piston, as well as supplying an engine speed (RPM) signal. This allows PCM to fire appropriate ignition coil at the proper time, determine triggering of the fuel injectors, and to compute crankshaft position and RPM. CKP sensor signal is also used to detect a cylinder misfire by monitoring changes in crankshaft speed.