What does code P1690 mean?

P1690 · ChryslerFuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor

P1690 on a Chrysler vehicle means the engine control module (ECM) has compared the crankshaft position signal from the fuel injection pump's internal CKP sensor against the signal from the primary crankshaft position sensor and found they do not agree. The ECM sets this code when the two signals differ in timing or pulse count beyond an acceptable window, indicating a synchronization fault between the pump and the engine's main crank reference.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

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