Komatsu Fault Code

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DHPAMA

Hydraulic Drift / Error Code Active

Variant 1

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.

Variant 2

System

Hydraulics / Sensors

Symptom

Slow Travel / Straight Tracking Drifts

Diagnosis & fix steps

LOGIC: Front (F) Main Pump Discharge Pressure Sensor Voltage Out of Range (<0.3V or >4.5V). ACTION: Swap F-Pump and R-Pump 3-pin pressure sensors on pump head. If code changes to DHPBMA, replace sensor. If code persists, check 5V reference supply and test signal line continuity to Pump Controller.

Red Seal field insights

Sensor Swapping Diagnostic: Komatsu uses identical pressure transducers for both pump outputs; swapping plugs between Front and Rear pumps immediately isolates internal sensor breakdown from harness issues.

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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