What does code P1391 mean?

Q: What does code P1391 mean?

Intermittent Loss of CMP Or CKP. P1391 on Chrysler vehicles means the engine computer has detected an intermittent loss of signal from either the camshaft position sensor (CMP) or the crankshaft position sensor (CKP). The computer sets this code when the signal from one or both sensors drops out momentarily while the engine is running, often without storing a hard fault for a specific sensor.

DTC codes / Chrysler codes / P1391

P1391 · ChryslerIntermittent Loss of CMP Or CKP

P1391 on Chrysler vehicles means the engine computer has detected an intermittent loss of signal from either the camshaft position sensor (CMP) or the crankshaft position sensor (CKP). The computer sets this code when the signal from one or both sensors drops out momentarily while the engine is running, often without storing a hard fault for a specific sensor.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.