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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 >> P249E-Closed Loop SCR REDUCTANT Injection Control At Limit - Flow Too High >> 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.

The Powertrain Control Module (PCM) uses the NOx Sensor 1/1 feedback along with engine operating and environmental conditions to calculate the diesel exhaust fluid dosing rate. The DEF Dosing Control Unit will turn on the MIL Lamp via the PCM immediately after the monitor runs and fails. The DEF Dosing Control Unit will turn off the MIL Lamp via the PCM immediately after the monitor runs and passes.

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