Caterpillar Fault Code

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1250-9

Remote Control Inop / Lag

Variant 1

System

Network

Symptom

Remote Control Inop / Lag

Diagnosis & fix steps

LOGIC: Remote Control Receiver Abnormal Update. ACTION: Check CAT Data Link wiring for 120 Ω resistance. Ensure receiver has unobstructed line-of-sight.

Red Seal field insights

Logic: ECM lost communication heartbeat with the receiver. Common on "Command for Excavation" builds.

Variant 2

System

Electrical

Symptom

Remote Control Comm: Abnormal Update

Diagnosis & fix steps

LOGIC: Loss of CAN heartbeat from RC module. ACTION: Check CAT Data Link wiring and 120-ohm terminating resistors.

Red Seal field insights

This code triggers when the machine loses "eyes" on the remote interface; common on line-of-sight units.

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.

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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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