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CCU codes

John Deere CCU Fault Codes / CCU Diagnostic Trouble Codes

Welcome to the comprehensive archive of John Deere CCU fault codes and CCU diagnostic trouble codes. Here, you will find detailed information and troubleshooting guides for issues related to the Chassis Control Unit (CCU) and Vehicle Load Center (VLC) Control Unit in your John Deere machinery. Understanding and resolving these error codes is crucial for maintaining the performance, safety, and reliability of your equipment.

Overview of John Deere CCU and VLC Control Units

The Chassis Control Unit (CCU) and Vehicle Load Center (VLC) share a common control unit flex box, known as the Vehicle Control Unit (VCU). These units are integral to both PowerShift Transmission (PST) and AutoPowr™ / IVT™ systems. The CCU plays a vital role in controlling, monitoring, and protecting various functions across the chassis, drivetrain, hydraulic systems, and engine.

Key Functions Managed by the CCU:

  • Chassis Functions: Includes fuel level monitoring, iTEC™ controls, and alarm systems.
  • Drive Train Functions: Manages differential lock and rear PTO operations.
  • Hydraulic Functions: Oversees hydraulic oil filter restriction, oil temperature, and oil pressure.
  • Engine Functions: Monitors air filter restriction to ensure optimal engine performance.

Common John Deere CCU Fault Codes

  1. CCU 000100.01 – Engine Oil Pressure Signal Extremely Low
    • Description: Indicates critically low engine oil pressure, risking severe engine damage.
    • Solution: Check oil levels, inspect the oil pressure sensor, and ensure the oil pump is functioning properly.
  2. CCU 000100.04 – Engine Oil Pressure Signal Out of Range Low
    • Description: Signifies low oil pressure, affecting safe engine operation.
    • Solution: Verify oil levels, inspect the sensor and wiring, and test oil pressure.
  3. CCU 000110.03 – Engine Coolant Temperature Signal Out of Range High
    • Description: Engine is overheating, risking severe damage.
    • Solution: Check coolant levels, inspect the cooling system, and ensure the thermostat is working.
  4. CCU 000110.04 – Engine Coolant Temperature Signal Out of Range Low
    • Description: Engine coolant temperature is too low, affecting efficiency.
    • Solution: Ensure proper coolant levels, check the temperature sensor, and verify thermostat operation.
  5. CCU 000110.16 – Engine Coolant Temperature Signal Moderately High
    • Description: Indicates the engine is running hotter than normal.
    • Solution: Inspect cooling system components and monitor engine temperature closely.

Diagnosing and Resolving CCU Error Codes

Understanding John Deere CCU fault codes and diagnostic trouble codes is essential for timely and effective troubleshooting. Each error code provides specific information about the nature of the fault and the affected system. Here are some general steps for diagnosing and resolving these codes:

  1. Identify the Error Code: Use diagnostic tools to read the specific fault code displayed by the CCU.
  2. Consult the Manual: Refer to the John Deere technical manual for detailed descriptions and troubleshooting steps for each code.
  3. Inspect Relevant Components: Based on the fault code, inspect the associated sensors, wiring, and mechanical parts.
  4. Perform Necessary Repairs: Replace or repair any faulty components identified during inspection.
  5. Reset the Control Unit: After addressing the issue, reset the CCU and verify that the fault code is cleared.

Importance of Regular Maintenance

Regular maintenance and proactive inspection of your John Deere machinery can prevent many of the issues signaled by CCU fault codes. Keeping an eye on fluid levels, ensuring proper operation of sensors and control units, and addressing minor issues before they escalate are key practices for maintaining optimal equipment performance.

John Deere CCU fault codes and diagnostic trouble codes are critical for identifying and resolving issues within the chassis control unit and related systems. By understanding these codes and following proper troubleshooting procedures, you can ensure the safety, efficiency, and longevity of your John Deere machinery. For more detailed information and specific troubleshooting steps, refer to the John Deere technical manuals and consult with authorized service professionals.

  • CCU 523907.02 – PTO Remote Enable Switch Conflict

    John Deere

    This fault code indicates a conflict with the PTO remote enable switch, where the control unit receives simultaneous high or low voltage inputs for both the ON and OFF states. Such conflicts can cause erratic or unreliable operation of the…

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  • CCU 523851.02 – iTEC™ Disabled Due To HCC/SCC/TEC

    John Deere

    This code is triggered when the Intelligent Total Equipment Control (iTEC™) system is aborted due to a lack of response from either the Hitch Control Unit (HCC), Selective Control Valve Control Unit (SCC), or Tractor Equipment Control Unit (TEC). This…

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  • CCU 523844.12 – Differential Lock Braking Disabled

    John Deere

    This fault code indicates that the differential lock switch has been engaged (closed) for more than 5 minutes continuously. The differential lock is intended for temporary use to provide extra traction in difficult conditions. Prolonged engagement can lead to overheating…

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  • CCU 523839.02 – Secondary Brake Switch Conflict

    John Deere

    This fault code is generated when there is a conflict between the states indicated by the secondary brake switches. Specifically, the secondary brake is either disengaged while the switch indicates it is on, or engaged while the switch indicates it…

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  • CCU 523749.16 – PTO Clutch Slipping Too Long

    John Deere

    This fault code is triggered when the PTO clutch slips excessively, typically due to repeated engagement under heavy loads by the operator. High engine speeds combined with the engagement of the PTO can cause the engine RPM to drop to…

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  • CCU 523316.04 – CCU Switched Supply Voltage Low

    John Deere

    This fault code indicates that the voltage supplied to the Chassis Control Unit (CCU) is below the normal operating threshold, specifically dropping below 9.0 volts. Low supply voltage can impair the functionality of the CCU, leading to potential issues in…

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  • CCU 523698.09 – AMS Display Message Missing

    John Deere

    This fault code occurs when the Chassis Control Unit (CCU) fails to receive necessary messages from the GreenStar™ Display, part of John Deere’s Advanced Management System (AMS). This communication failure can affect the operator’s ability to monitor and control various…

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  • CCU 522384.14 – 4R/5R PTO Inhibited

    John Deere

    This fault code is triggered when the Chassis Control Unit (CCU) detects that the vehicle is engaged in a high-speed reverse gear (4R or 5R) while the rear Power Take-Off (PTO) is activated. This situation is typically prohibited to prevent…

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  • CCU 522260.02 – Wheel Speed Sensors Mismatch

    John Deere

    This code is triggered when there is a discrepancy between the readings of the primary and secondary wheel speed sensors. Such mismatches can lead to inaccuracies in speedometer readings, vehicle stability controls, and other systems that rely on accurate wheel…

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  • CCU 003509.04 – Sensor Supply Voltage Out of Range Low

    John Deere

    This fault code indicates that the voltage supplied to sensors is below the normal operational range, specifically dropping below 4.8 volts. This could be due to a failing battery, poor wiring, or issues within the vehicle’s charging system, leading to…

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  • CCU 003509.03 – Sensor Supply Voltage Out of Range High

    John Deere

    This fault code arises when the voltage supplied to sensors is found to be above the normal operating range, specifically exceeding 5.2 volts. Such a condition may indicate an issue with the vehicle’s voltage regulator or electrical system, which can…

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