Caterpillar Fault Code
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Aftertreatment Regeneration Device: Erratic
Variant 1
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.
Variant 2
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.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
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