What does Caterpillar fault code 110-04 mean?

Q: What does Caterpillar fault code 110-04 mean?

110-04 indicates: The ECM detects a "Short to Ground." Engine may enter an immediate severe derate or shutdown to prevent perceived overheating. Fix: ACTION: 1. Isolation Test: Unplug the sensor. If the code stays 110-04, the signal wire is rubbed through to the frame. 2. Sensor Check: Measure resistance across sensor pins; "0" Ohms indicates an internal sensor short. 3. Harness Search: Inspect the harness where it crosses over the valve cover or near the alternator.

Caterpillar Fault Code

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110-04

The ECM detects a "Short to Ground." Engine may enter an immediate severe derate or shutdown to prevent perceived overheating.

System

Not specified

Symptom

The ECM detects a "Short to Ground." Engine may enter an immediate severe derate or shutdown to prevent perceived overheating.

Diagnosis & fix steps

ACTION: 1. Isolation Test: Unplug the sensor. If the code stays 110-04, the signal wire is rubbed through to the frame. 2. Sensor Check: Measure resistance across sensor pins; "0" Ohms indicates an internal sensor short. 3. Harness Search: Inspect the harness where it crosses over the valve cover or near the alternator.

Red Seal field insights

If you find the short and it's a tiny "pinhole" in the wire rubbing the block, don't just tape it. Use liquid electrical tape or a heat-shrink sleeve to ensure a vibration-proof seal that won't rub through again next week.

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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