What does code P1390 mean?

Q: What does code P1390 mean?

Timing Belt Skipped One Tooth Or More. P1390 on Mitsubishi vehicles means the engine control module (ECM) has detected that the timing belt has jumped at least one tooth on its sprocket, throwing the camshaft and crankshaft out of sync. The ECM compares signals from the camshaft position sensor and crankshaft position sensor and flags this code when the correlation error exceeds the calibrated threshold. This is a mechanical timing fault, not a sensor failure, and it can cause poor running or a no-start condition.

DTC codes / Mitsubishi codes / P1390

P1390 · MitsubishiTiming Belt Skipped One Tooth Or More

P1390 on Mitsubishi vehicles means the engine control module (ECM) has detected that the timing belt has jumped at least one tooth on its sprocket, throwing the camshaft and crankshaft out of sync. The ECM compares signals from the camshaft position sensor and crankshaft position sensor and flags this code when the correlation error exceeds the calibrated threshold. This is a mechanical timing fault, not a sensor failure, and it can cause poor running or a no-start condition.

SystemPowertrain

Code typeMitsubishi specific

SeverityHigh

Fix difficultyProfessional

AreaIgnition system and misfire

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