DTC P1391: Intermittent Loss Of CMP Or CKP: Description

Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are monitored with engine running or cranking. DTC will set in Powertrain Control Module (PCM) memory when PCM senses failure counter reaches 20 failures for 2 consecutive trips. Possible causes are: CKP sensor improperly installed, defective CKP sensor, defective CMP sensor, defective PCM, defective tone wheel/flexplate, defective connectors or defective wiring.