What is Caterpillar Fault Code 2713-6?

Caterpillar Fault Code 2713-6 indicates a Current Below Normal condition on the Hydraulic Activation Solenoid Control circuit. Specifically, this code signals that the ECM (Engine Control Module) has detected an abnormally low current draw from the hydraulic activation solenoid, falling outside the manufacturer's acceptable operating range.

This solenoid is responsible for enabling hydraulic flow throughout the machine's implement system. When this circuit fails or reads incorrectly, the ECM cannot confirm proper solenoid engagement, directly impacting machine operability and safety protocols.

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Common Symptoms

Operators and technicians should watch for the following when Code 2713-6 is active:

• Hydraulic implements become unresponsive or fail to activate entirely
• Active warning lamp or fault indicator illuminates on the operator display
• Machine enters a reduced performance or derate mode to protect hydraulic components
• Intermittent hydraulic engagement, particularly during cold starts or under load
• Unexpected machine shutdown or failure to cycle through normal startup sequences

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Potential Causes

On used Caterpillar excavators, this code commonly stems from:

• Open circuit or broken wire within the solenoid harness — especially at known flex and rub points near the boom and swing frame
• Corroded or moisture-damaged connectors at the solenoid or ECM pin locations
• Failed hydraulic activation solenoid — coil burnout or internal short reducing current draw
• Damaged wiring harness caused by previous repairs, abrasion against metal edges, or rodent damage
• ECM output driver failure, less common but possible on high-hour machines

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How to Troubleshoot and Fix Code 2713-6

Step 1 — Perform a Visual Harness Inspection Begin with a thorough physical inspection of the wiring harness running to the hydraulic activation solenoid. On used excavators, prioritize checking for chafed insulation, pinch points, and corrosion at connector terminals. Clean connectors with electrical contact cleaner before testing.

Step 2 — Measure Solenoid Coil Resistance Disconnect the solenoid connector and use a digital multimeter to measure coil resistance. A healthy solenoid typically reads between 20–30 ohms (verify against your specific Cat service manual). A reading of OL (open loop) confirms a failed coil requiring solenoid replacement.

Step 3 — Check Circuit Continuity and Voltage Supply Using your multimeter or Cat ET (Electronic Technician) diagnostic software, verify that the ECM is supplying correct voltage (typically 24V DC) to the solenoid circuit. Test wire continuity from the ECM connector pin to the solenoid connector to identify any open circuit conditions.

Step 4 — Clear and Retest After repairs, use Cat ET to clear active fault codes and perform a functional test cycle. Confirm the code does not return under normal operating conditions.

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Disclaimer: This guide is intended for informational purposes and general diagnostic reference. Always consult a certified Caterpillar dealer or licensed heavy equipment technician before performing repairs. Improper diagnosis or repair may result in equipment damage, voided warranties, or safety hazards.