P1371 GMC Missing Low Resolution Signal

Possible causes
– Faulty Crankshaft Sensor
– Crankshaft Sensor harness is open or shorted
– Crankshaft Sensor circuit poor electrical connection
– Faulty Ignition Control Module
When is the code detected?
The Powertrain Control Module (PCM) detects a predetermined amount of high resolution pulses before detecting any low resolution pulses.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)