What is Komatsu PC240LC-8 Fault Code E-13?

Fault Code E-13 on the Komatsu PC240LC-8 indicates a hydraulic pump solenoid valve malfunction in the main control circuit. This diagnostic trouble code (DTC) specifically signals that the engine control module (ECM) has detected an abnormal electrical signal or performance issue with the pump's solenoid valve, which regulates hydraulic flow and pressure throughout the machine.

This code is critical for the PC240LC-8 because the hydraulic pump solenoid directly controls pump displacement and output, affecting all machine functions including swing, boom, arm, and bucket operations. When E-13 triggers, the excavator's performance and fuel efficiency are immediately compromised, as the system cannot properly modulate hydraulic demand based on operational load.

Common Symptoms

Operators may experience the following when Code E-13 is active:

• Reduced hydraulic power across all functions, with noticeably slower cycle times
• Warning light illuminated on the monitor panel with E-13 displayed
• Erratic hydraulic response, including surging or inconsistent boom/arm speed
• Engine over-revving without corresponding hydraulic output due to pump flow mismatch
• Intermittent loss of multiple hydraulic functions simultaneously

Potential Causes

The most common technical reasons for E-13 on used PC240LC-8 excavators include:

• Solenoid valve coil failure due to overheating or internal short circuits (common after 6,000+ operating hours)
• Damaged wiring harness near the pump mounting area where cables rub against the frame or hydraulic lines
• Corroded or loose connector pins at the solenoid valve plug (especially in machines exposed to wet environments)
• ECM internal fault causing incorrect signal output to the solenoid
• Low system voltage from weak batteries or failing alternator affecting solenoid actuation
• Contaminated hydraulic oil causing mechanical sticking of the solenoid spool

How to Troubleshoot and Fix Code E-13

Step 1: Visual Inspection Begin by inspecting the hydraulic pump solenoid valve and associated wiring harness. On used excavators, check for harness chafing where cables pass near the engine mount and pump housing. Examine connector pins for corrosion, bent contacts, or moisture intrusion—clean with electrical contact cleaner if needed.

Step 2: Electrical Testing Using a digital multimeter, measure solenoid coil resistance with the connector disconnected. Specification should be approximately 10-15 ohms (consult service manual for exact values). Check for supply voltage at the connector with ignition on—should read 12-24V DC depending on system. Test for continuity to ground, which indicates a short circuit.

Step 3: Solenoid Function Test With Komatsu diagnostic software (KOMTRAX or PC-based service tool), command the solenoid valve to actuate while monitoring current draw. Compare readings against factory specifications. If electrical values are correct but code persists, the solenoid may be mechanically seized internally.

Step 4: Component Replacement If testing confirms solenoid failure, replace the pump control solenoid valve assembly. For used machines, simultaneously inspect the ECM connector terminals and replace any corroded pins. After replacement, clear codes, perform a hydraulic system calibration using diagnostic software, and cycle all functions under load.

---

Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu service manual for your specific machine serial number and consult a certified hydraulic technician for complex repairs involving high-pressure systems.