Caterpillar Fault Code
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Regen Inop / Fault Lamp
Variant 1
System
Aftertreatment
Symptom
Regen Inop / Fault Lamp
Diagnosis & fix steps
LOGIC: DEF Dosing Unit Pressure Data Erratic.
ACTION: Check for "white flakes" (urea crystallization) in the dosing line or a loose sensor ground.
Red Seal field insights
Logic: ECM sees pressure spikes/drops that are physically impossible.
FIX: Often a failing pressure sensor inside the Bosch pump module.
Variant 2
System
Emissions
Symptom
Aftertreatment Regeneration Device: Erratic
Diagnosis & fix steps
LOGIC: Flame detection failure.
ACTION: Inspect the ARD spark plug and fuel nozzle for carbon fouling.
Red Seal field insights
Common in cold climates where the "flame out" occurs due to poor fuel atomization.
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