What is John Deere E240LC Fault Code 000655.02?

Fault Code 000655.02 indicates an Auxiliary Hydraulic Flow Control Valve Circuit malfunction with an "Electrical Current Below Normal" condition. This diagnostic trouble code (DTC) specifically signals that the Engine Control Module (ECM) has detected insufficient electrical current flowing through the auxiliary hydraulic flow control solenoid valve circuit.

On the John Deere E240LC excavator, this code affects the auxiliary hydraulic system that powers attachments like breakers, grapples, or shears. The control valve regulates hydraulic flow to these attachments, and when the electrical signal falls below the manufacturer's specified threshold (typically due to high resistance or open circuits), the ECM triggers this fault. This is critical because compromised auxiliary hydraulic function directly impacts productivity and can indicate underlying electrical issues that may affect other systems if left unaddressed.

Common Symptoms

When fault code 000655.02 is active on your E240LC, operators typically experience:

• Auxiliary hydraulic functions become inoperative or intermittent (attachment won't run or operates erratically)
• Warning lamp illumination on the instrument cluster with possible error message display
• Reduced hydraulic flow to auxiliary circuits even when control is activated
• No response from auxiliary hydraulic controls when attempting to operate attachments
• ECM may log the fault without immediate performance changes in some cases (passive code)

Potential Causes

The most common technical reasons for this specific code on used E240LC excavators include:

• Damaged or corroded wiring harness connections at the auxiliary flow control valve (common wear point near valve mounting bracket)
• Failed auxiliary flow control solenoid valve with internal coil open circuit or degraded windings
• Connector corrosion or moisture intrusion at the valve connector (particularly on machines with high hours in wet environments)
• Chafed or broken wires in the harness routing between the ECM and valve assembly (known rub point near cab pivot)
• Poor ground connection at valve mounting location due to paint, rust, or loose hardware
• ECM internal driver circuit failure (less common but possible on high-hour machines)

How to Troubleshoot and Fix Code 000655.02

Step 1: Visual Inspection Begin by disconnecting the battery and thoroughly inspecting the auxiliary flow control valve connector and associated wiring harness. Look for corrosion (green/white residue), bent pins, moisture, or physical damage. On used excavators, check the harness routing for wear points where cables contact frame members, especially near the valve mounting area and along the boom base.

Step 2: Electrical Testing Using a digital multimeter (DMM), measure the resistance of the auxiliary flow control solenoid. Disconnect the valve connector and test across the solenoid terminals. Typical specification is 3-7 ohms (consult your service manual for exact values). An open circuit (infinite resistance) indicates solenoid failure. Also check for short to ground by measuring from each terminal to the valve body (should read infinite resistance).

Step 3: Circuit Continuity Check With the valve disconnected, test wiring continuity from the ECM connector to the valve connector using your multimeter. Check both the power supply wire and ground return path. Resistance should be less than 5 ohms for each circuit. High resistance indicates damaged wiring requiring harness repair or replacement.

Step 4: Voltage Supply Test Reconnect the harness (valve still disconnected) and turn the key to the "ON" position. Using a multimeter or breakout box, measure voltage at the valve connector while commanding auxiliary flow through the machine's controls or using John Deere Service Advisor diagnostic software. You should see battery voltage (approximately 12-14V) when activated. No voltage indicates an ECM driver issue or upstream wiring problem.

Step 5: Component Replacement and Verification If testing confirms solenoid failure, replace the auxiliary flow control valve assembly with OEM or equivalent parts. For used excavators, always apply dielectric grease to connectors during reassembly to prevent future corrosion. After replacement, clear codes using diagnostic software and perform a functional test of auxiliary hydraulics under load. Verify the code does not return after several operating cycles.

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Disclaimer: This guide provides general diagnostic information. Always consult the official John Deere service manual for your specific machine serial number and seek assistance from certified technicians for complex electrical diagnostics or if you're unfamiliar with high-voltage systems.