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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> U1421-Implausible Ignition Key Off Time Received >> Code Description >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

This monitor checks if the timer that counts the ignition off time is stuck.