Caterpillar Fault Code

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1658-4

Right Tool Inop

Variant 1

System

Controls

Symptom

Right Tool Inop

Diagnosis & fix steps

LOGIC: Right Joystick Thumbwheel Voltage Below Normal. ACTION: Disconnect joystick; if code changes to -3, the thumbwheel assembly is shorted.

Red Seal field insights

Logic: Short to ground on the Right hand side. FIX: Replace the thumbwheel assembly or handle harness.

Variant 2

System

Controls

Symptom

Right Joystick Thumbwheel: Voltage Below Normal

Diagnosis & fix steps

LOGIC: Short to ground on right-hand aux control. ACTION: Measure 5V Ref at the joystick connector.

Red Seal field insights

If both 1657 and 1658 appear, look for a shared 5V supply failure in the cab harness.

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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