What does Other fault code D110KB mean?

Q: What does Other fault code D110KB mean?

D110KB indicates: Battery not charging; Lights dim; Low voltage alarms. Fix: Alternator R-Terminal Abnormal. LOGIC: The controller is not seeing the "Charge" signal from the alternator while the engine is running. ACTION: 1. Check the "R" terminal wire (usually a small wire) for a break. 2. Check the fan belt tension. FIX: Repair the R-terminal wire pigtail or replace the Alternator.

Other Fault Code

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D110KB

Battery not charging; Lights dim; Low voltage alarms.

System

Komatsu (Monitor)

Symptom

Battery not charging; Lights dim; Low voltage alarms.

Diagnosis & fix steps

Alternator R-Terminal Abnormal. LOGIC: The controller is not seeing the "Charge" signal from the alternator while the engine is running. ACTION: 1. Check the "R" terminal wire (usually a small wire) for a break. 2. Check the fan belt tension. FIX: Repair the R-terminal wire pigtail or replace the Alternator.

Red Seal field insights

On Komatsu, the "R" terminal tells the computer the engine is actually turning. If this wire breaks, the machine might not allow the AC to turn on or the auto-lube to fire, even if the alternator is still technically charging the batteries.

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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