P1371 GMC - Missing Low Resolution Signal
- 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.
- Engine Light ON (or Service Engine Soon Warning Light)
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