What is Komatsu PC210-10 Fault Code DHSGMA?

Fault Code DHSGMA indicates a communication error or data mismatch between the machine's hydraulic system controller and the main engine ECM (Engine Control Module). This diagnostic trouble code specifically relates to the integrated hydraulic monitoring system that Komatsu introduced in the Dash-10 series excavators, which coordinates engine output with hydraulic demand for optimal fuel efficiency and performance.

In the PC210-10, this code typically signifies that the CAN bus communication between the pump controller and engine management system has been interrupted or is receiving inconsistent signals. This is critical because the PC210-10 relies on real-time data exchange between these systems to adjust engine rpm, hydraulic flow rates, and implement the machine's fuel-saving modes. When this communication fails, the excavator cannot properly match hydraulic power to engine output, resulting in reduced productivity and potential component stress.

Common Symptoms

• Service warning light illuminated on the monitor panel with reduced machine responsiveness
• Noticeable loss of hydraulic power during combined functions (swing plus boom operation)
• Engine may run at fixed rpm regardless of hydraulic load demand
• Automatic idle shutdown feature becomes non-functional
• Machine may enter derate mode, limiting maximum engine speed to approximately 1,600 rpm

Potential Causes

The most frequent causes of DHSGMA on used PC210-10 excavators include:

• Corroded or loose CAN bus connectors between the pump control module and ECM (common wear point behind the operator's cab)
• Failed hydraulic pump controller due to moisture infiltration in older machines
• Damaged wiring harness at pivot points near the turntable where cables flex during swing operations
• ECM software version mismatch after component replacement without proper initialization
• Low system voltage from aging batteries causing intermittent communication dropouts
• Physical damage to the CAN network termination resistor (120-ohm resistor failure)

How to Troubleshoot and Fix Code DHSGMA

Step 1: Visual Inspection Begin by inspecting all wiring harnesses running from the engine compartment to the hydraulic pump area. On used excavators, pay particular attention to harness routing where cables contact metal edges or experience repeated flexing. Check all multi-pin connectors for green corrosion, bent pins, or moisture accumulation.

Step 2: Electrical Testing Using a digital multimeter, verify battery voltage is above 24V (for 24V systems). Check CAN bus continuity between the ECM and pump controller—you should measure approximately 60 ohms resistance between CAN-High and CAN-Low terminals with both modules connected. Inspect the termination resistors at each end of the network.

Step 3: Diagnostic Software Analysis Connect Komatsu KOMTRAX or compatible diagnostic software to read real-time data streams. Monitor whether the ECM is receiving hydraulic load signals. Compare software versions between ECM and pump controller—mismatched firmware often causes DHSGMA after parts replacement on used machines.

Step 4: Component Replacement If wiring and voltage checks pass, the pump controller module is the most likely culprit in higher-hour machines. Before replacing, clean all ground connections and apply dielectric grease to connectors. After any component replacement, perform system initialization using diagnostic software.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu service manual for your specific machine serial number and consider engaging a certified technician for complex electrical diagnostics.