Case Fault Code
Free · no signupP2457
No Regen.
System
Emmissions EGR)
Symptom
No Regen.
Diagnosis & fix steps
LOGIC: EGR Cooler efficiency is low.
ACTION: Check the temperature drop across the EGR cooler. If the difference is < 20Ā°C, the cooler is internally bypass-leaking or plugged with soot.
Red Seal field insights
Pro-Tip: Check the Coolant Flow Valve. If it's stuck closed, the EGR gas stays hot, tripping the code even if the cooler itself is clean.
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