Cummins Fault Code

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FC 441

ECM may lose communication; engine stumbles or display flickers.

System

Not specified

Symptom

ECM may lose communication; engine stumbles or display flickers.

Diagnosis & fix steps

ACTION: 1. Measure battery voltage (OFF: ~12.6V/25.2V). 2. Check Red power wires for corrosion at fuse link. 3. Clean all Black grounds.

Red Seal field insights

Check the battery disconnect switch. Over time, the internal contacts pit and create high resistance, dropping voltage only when the engine is under load.

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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