Caterpillar Fault Code

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2458-2

No Regeneration. The machine refuses to start a "Parked Regen"; Service light flashes.

System

Aftertreatment (DPF)

Symptom

No Regeneration. The machine refuses to start a "Parked Regen"; Service light flashes.

Diagnosis & fix steps

DPF Differential Pressure Sensor Performance. LOGIC: The ECM sees a pressure difference across the DPF that is physically impossible (e.g., higher pressure after the filter than before it). ACTION: Inspect the pressure sensor tubes for soot blockage or moisture/ice.

Red Seal field insights

Pro-Tip: 90% of the time, the sensor itself is fine. The issue is usually moisture trapped in the sensing tubes that has frozen or turned into a "mud" with soot. Blow air through the tubes (disconnected from the sensor!) back toward the exhaust. If the tubes are clear and the code persists, the sensor internal diaphragm is likely "skewed" and needs replacement.

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.

Book an uptime review

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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