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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 732 (6.4L - DTCS P2320 To U1449 - 2500 Hd, 3500 Hd) >> Diagnosis And Testing >> P2457-Exhaust Gas RECIRCULATION Cooling System Performance >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
ENGINE COOLANT LOW
HIGH RESISTANCE IN THE EGR TEMPERATURE SENSOR SIGNAL CIRCUIT
HIGH RESISTANCE IN THE SENSOR GROUND CIRCUIT
EGR COOLER ASSEMBLY RESTRICTED
INTERNAL OR EXTERNAL CRACK IN THE EGR COOLER ASSEMBLY

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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