Komatsu Fault Code

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DHPAMA

Hydraulic Drift / Error Code Active

System

Hydraulic Monitoring

Symptom

Hydraulic Drift / Error Code Active

Diagnosis & fix steps

LOGIC: Front Pump Pressure Sensor Signal Abnormal. ACTION: Check 5V sensor supply and output voltage at front pump pressure transducer pin. Swap harness leads with rear pump sensor to confirm whether fault follows sensor or wiring.

Red Seal field insights

Machine ECU uses front pump pressure feedback to calculate TVC and LS-EPC current outputs. Invalid readings cause erratic pump displacement control.

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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