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 96 failures for 2 consecutive trips. Possible causes for DTC to set are: Crankshaft Position (CKP) sensor improperly installed, defective CKP sensor, defective Camshaft Position (CMP) sensor, defective PCM, defective tone wheel/flexplate, defective connectors or defective wiring.