Caterpillar Fault Code

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MID 036 CID 2265 FMI 03

Engine Sags under Heavy Push / Stumble

System

Fuel Supply

Symptom

Engine Sags under Heavy Push / Stumble

Diagnosis & fix steps

LOGIC: Electric Fuel Priming Pump Relay Circuit Short to Battery. ACTION: Inspect the fuel priming pump relay located inside the primary fuel filter housing enclosure. Trace control wire back to Engine ECM plug J1 for harness insulation shorting.

Red Seal field insights

Fuel Starvation: When pushing heavy fill dirt, an inoperative or locked priming circuit allows fuel gallery aeration to build up, starving the high-pressure common rail.

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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