What is Hyundai R335LC-9T Fault Code 558-13?

Fault Code 558-13 indicates a "Hydraulic Pump Solenoid Valve Circuit - Out of Calibration/Mechanical System Not Responding Properly" on the Hyundai R335LC-9T excavator. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects that the hydraulic pump's proportional solenoid valve is not responding correctly to commanded electrical signals, or the mechanical adjustment is outside acceptable parameters.

This code specifically affects the main hydraulic pump's flow control system, which regulates pump output based on operator demand and load sensing. The R335LC-9T uses an electronically controlled variable displacement pump system where solenoid valves modulate hydraulic pressure to adjust swash plate angle. When calibration drifts or the mechanical linkage fails to respond, system efficiency drops dramatically, potentially causing overheating, sluggish operation, or complete hydraulic failure.

Common Symptoms

• Reduced hydraulic performance across all functions, with noticeably slower boom, arm, and swing speeds
• Erratic or inconsistent hydraulic response where the machine operates normally for brief periods then suddenly loses power
• Warning lamp illumination on the instrument cluster, often accompanied by an audible alarm
• Increased engine RPM without corresponding hydraulic power, indicating the pump isn't loading the engine properly
• Hydraulic oil overheating due to improper flow regulation and excessive bypass circulation

Potential Causes

The most common technical causes for Code 558-13 on used R335LC-9T excavators include:

• Worn or failed proportional solenoid valve on the main hydraulic pump (common failure point after 6,000+ operating hours)
• Corroded or damaged wiring harness connectors at the pump solenoid, particularly where the harness routes near the turntable bearing where vibration and debris exposure are highest
• Mechanical binding or wear in the pump's swash plate control linkage or feedback mechanism
• Low voltage supply to the solenoid circuit due to aging battery cables, corroded ground connections, or failing alternator output
• ECM calibration drift or corrupted software parameters, especially on machines that have had previous electrical system repairs
• Contaminated hydraulic oil causing spool valve sticking within the proportional solenoid assembly

How to Troubleshoot and Fix Code 558-13

Step 1: Perform Visual and Electrical Inspection

Begin by disconnecting the solenoid valve connector at the main hydraulic pump. Inspect for corrosion, bent pins, or oil contamination inside the connector body—a common issue on used machines operating in wet environments. Using a digital multimeter, measure solenoid resistance; it should typically read between 8-15 ohms (consult service manual for exact specifications). Check supply voltage at the harness side with ignition on; you should see approximately 12 volts DC.

Step 2: Test Solenoid Operation and Mechanical Response

With the Hyundai Hi-MATE diagnostic software or compatible CANbus scanner, command the solenoid valve through its full range while monitoring current draw (should be 0.5-2.0 amps depending on command signal). Simultaneously observe if the pump's mechanical feedback linkage moves smoothly. On used excavators, physically inspect the swash plate control mechanism for binding, worn bushings, or seized pivot points that prevent proper calibration response.

Step 3: Check Wiring Harness Routing and Ground Circuits

Trace the solenoid harness from the ECM to the pump, paying special attention to areas where the harness crosses moving components or sharp edges near the engine mount and pump mounting bracket. For used machines, frayed insulation causing intermittent shorts to ground is extremely common. Verify ground circuit continuity measures less than 0.5 ohms resistance. Clean all ground terminals and apply dielectric grease.

Step 4: Calibration and Component Replacement

If electrical circuits test properly, perform an ECM-guided calibration procedure using diagnostic software to relearn solenoid valve parameters. If calibration fails repeatedly, replace the proportional solenoid valve assembly (Hyundai part number typically 31N9-10131 or equivalent). After replacement, a complete pump calibration routine must be performed. For persistent issues on high-hour used machines, the entire pump control assembly may require replacement or professional rebuilding.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Hyundai service manual for your specific machine serial number. Hydraulic system diagnosis can be complex; if you're uncomfortable with these procedures, contact a certified Hyundai excavator technician or authorized service center.