John Deere fault codes

  • CCU 523916.15 – Hydraulic Oil Filter Restricted

    John Deere error

    This fault code is activated when the hydraulic oil filter restriction sensor detects a pressure above 350 kPa (3.5 bar or 50.75 PSI) but below 425 kPa (4.25 bar or 61.64 PSI) while the engine speed is above 800 RPM for more than 15 seconds. This condition indicates that the hydraulic oil filter is becoming…

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  • CCU 523916.04 – Hydraulic Oil Filter Restriction Sensor Circuit Voltage Low

    John Deere error

    This fault code is generated when the voltage in the hydraulic oil filter restriction sensor circuit is lower than normal, indicating a possible short to ground or a fault within the sensor. This low voltage condition might lead the system to incorrectly assume that the filter is not restricted.

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  • CCU 523916.03 – Hydraulic Oil Filter Restriction Sensor Circuit Voltage High

    John Deere error

    This fault code indicates that the voltage in the hydraulic oil filter restriction sensor circuit is higher than normal, which can suggest a short to a high voltage source or a fault in the sensor itself. This high voltage condition might lead the system to incorrectly assume that the filter is not restricted.

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  • CCU 523916.00 – Hydraulic Oil Filter Restriction Sensor Bypassed Under 1500 rpm

    John Deere error

    This fault code indicates that the Chassis Control Unit (CCU) has detected a high-pressure condition in the hydraulic oil filter restriction sensor while the engine speed is below 1500 RPM for more than 15 seconds. This typically suggests that the sensor is bypassed, potentially due to a filter restriction or an issue with the sensor…

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  • CCU 523908.02 – Rear PTO External Switch Conflict

    John Deere error

    This fault code is generated when the CCU detects simultaneous ON and OFF signals from the rear PTO external switch. Such conflicting signals indicate a malfunction in the switch or the associated circuitry, leading to unreliable PTO operations.

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  • CCU 523907.02 – PTO Remote Enable Switch Conflict

    John Deere error

    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 PTO system.

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

    John Deere error

    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 prevents the iTEC™ system from completing its sequence, which can affect the automated management of…

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  • CCU 523844.12 – Differential Lock Braking Disabled

    John Deere error

    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 and excessive wear on the differential components.

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  • CCU 523839.02 – Secondary Brake Switch Conflict

    John Deere error

    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 is off. This conflict arises when the normally open (NO) and normally closed (NC) switches…

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  • CCU 523749.16 – PTO Clutch Slipping Too Long

    John Deere error

    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 around 500 RPM, leading to overheating of the PTO clutch. The CCU will turn off…

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  • CCU 523316.04 – CCU Switched Supply Voltage Low

    John Deere error

    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 managing and controlling various vehicle systems.

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