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UIC codes

Comprehensive Guide to John Deere UIC Fault Codes

Understanding John Deere UIC fault codes is crucial for maintaining and troubleshooting your equipment. These codes, also known as John Deere UIC diagnostic trouble codes or John Deere UIC error codes, help identify specific issues within the UIC control unit, which is responsible for managing the transmission control with AutoPowr/IVT transmission.

Common John Deere UIC Fault Codes

Here are the five most frequently encountered John Deere UIC fault codes:

UIC 524254.31 – Transmission Enable Relay Fault
- Occurrence: This code appears when there is a problem with the transmission enable relay circuit (K06/03 or K02/03), indicating a defective relay or issues with the ground circuit (lead 6003) or control lead (6064).
- Solution: Inspect and possibly replace the relay, check the ground circuit and control lead for damage or loose connections.
UIC 524264.02 – Control Unit Internal Fault
- Occurrence: This code is generated when an electronic malfunction is detected within the control unit.
- Solution: Perform a hard reset, inspect connections, update software, or replace the control unit if necessary.
UIC 600006.31 – Diagnostic Trouble Code Not Known
- Occurrence: Triggered by the CommandCenter (DTI) when it receives a UIC code that is not stored in its memory.
- Solution: Update the CommandCenter software, inspect CAN BUS wiring, and consult technical support if needed.
UIC 524166.02 – Brake Pedal Sensor Unit Fault at Right Pedal
- Occurrence: Occurs when the right brake pedal switch is not actuated properly, indicated by incorrect voltage readings at the right brake pedal potentiometer.
- Solution: Inspect the brake pedal sensor unit, verify switch signals, check wiring, and replace faulty components.
UIC 524173.02 – Clutch Pedal Potentiometer Voltage Ratio Error
- Occurrence: Detected when there is a mismatch between the output signals of the clutch pedal potentiometer, where the voltage at channel 1 must be double that of channel 2.
- Solution: Inspect the clutch pedal potentiometer, verify signal accuracy, and check wiring connections.

Importance of Understanding UIC Error Codes

John Deere UIC error codes play a pivotal role in the maintenance and repair of John Deere equipment. By identifying the exact nature of the issue, these codes enable quick and effective troubleshooting, ensuring minimal downtime and maintaining optimal performance of your machinery.

Where These Codes Occur:

Transmission Systems: Fault codes often appear in the transmission control unit, impacting the AutoPowr/IVT transmission.
Brake and Clutch Systems: Errors related to pedal sensors and potentiometers frequently occur here.
Control Units: Internal faults and communication issues within control units are common sources of these codes.

Regularly updating your diagnostic tools and staying informed about common fault codes can significantly enhance your ability to maintain John Deere equipment effectively. Always refer to the official John Deere manuals and technical support for comprehensive diagnostics and solutions.

UIC 523967.04 – S108 Sensor Unit for Speed Control Lever, Fault in Set Speed 2
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523967.04 is generated if there is a mismatch between the signals of the switch for speed band 2 and the potentiometer of the speed control lever (B67). The signal of the activated switch for…
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UIC 523967.02 – S108 Sensor Unit for Speed Control Lever, Fault in Set Speed 1
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523967.02 is generated if there is a mismatch between the signals of the switch for speed band 2 and the potentiometer of the speed control lever (B67). The signal of the activated switch for…
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UIC 523966.31 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Move Reverse Drive Lever To Neutral or Park Position
John Deere UIC codes
This operator information (DTC) UIC 523966.31 is generated when the comehome mode is activated (K07/04 or K03/04 connector for comehome feature in COME HOME position). The operator is informed that they should move the reverse drive lever to its neutral…
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UIC 523966.14 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Select a Direction of Travel
John Deere UIC codes
This operator information (DTC) UIC 523966.14 is generated when the comehome mode is activated (K07/04 or K03/04 connector for comehome feature in COME HOME position). The operator is informed that they should select a direction of travel to gain access…
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UIC 523966.11 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Restart
John Deere UIC codes
This operator information (DTC) UIC 523966.11 is generated when the comehome mode is activated (K07/04 or K03/04 connector for comehome feature in COME HOME position). The operator is informed that they should restart the tractor if they want to reactivate…
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UIC 523962.31 – B89 Front-Wheel Drive Axle Speed Sensor, Signal Does Not Match Transmission Output Speed
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523962.31 is generated under the following circumstances when the transmission oil temperature is above 10°C (50°F) and front-wheel drive is engaged: Difference between front-wheel drive axle speed and transmission output speed above 4% for…
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UIC 523961.12 – Park Lock, Fault (Travel Speed Detected with Park Lock Engaged)
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523961.12 is generated when the UIC control unit detects a travel speed of more than 0.1 km/h (0.06 mph) for longer than 0.7 seconds after engaging the park lock.
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UIC 523961.07 – Park Lock, Fault
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523961.07 is generated under the following conditions: If the park lock does not engage, even though the UIC commands park position and the tractor’s travel speed is such that engagement is permitted. If a…
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UIC 523961.02 – Park Lock Cannot Be Disengaged
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523961.02 is generated if there is a park lock engagement signal at the control unit, even though the reverse drive lever is not in the park position. However, this diagnostic trouble code may also…
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UIC 523960.31 – INFORMATION FOR OPERATOR: Travel Speed is Preselected without Valid Signal Indicating Operator Presence
John Deere UIC codes
This information for the operator (DTC) UIC 523960.31 is triggered if a direction of travel has been activated without any valid signal indicating that the operator is present (operator on seat, clutch, or brake pedals depressed).
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UIC 523959.31 – Fault at Transmission
John Deere UIC codes
This diagnostic trouble code (DTC) UIC 523959.31 is triggered if the control unit fails to detect tractor motion even though all the preconditions for motion are met. In its active state, this fault also generates a diagnostic trouble code at…
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John Deere News & Innovations: Equipment, Technology, Solutions

UIC codes

Comprehensive Guide to John Deere UIC Fault Codes

Common John Deere UIC Fault Codes

Importance of Understanding UIC Error Codes

Where These Codes Occur:

UIC 523967.04 – S108 Sensor Unit for Speed Control Lever, Fault in Set Speed 2

UIC 523967.02 – S108 Sensor Unit for Speed Control Lever, Fault in Set Speed 1

UIC 523966.31 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Move Reverse Drive Lever To Neutral or Park Position

UIC 523966.14 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Select a Direction of Travel

UIC 523966.11 – Tractor in ComeHome Mode INFORMATION FOR OPERATOR: Restart

UIC 523962.31 – B89 Front-Wheel Drive Axle Speed Sensor, Signal Does Not Match Transmission Output Speed

UIC 523961.12 – Park Lock, Fault (Travel Speed Detected with Park Lock Engaged)

UIC 523961.07 – Park Lock, Fault

UIC 523961.02 – Park Lock Cannot Be Disengaged

UIC 523960.31 – INFORMATION FOR OPERATOR: Travel Speed is Preselected without Valid Signal Indicating Operator Presence

UIC 523959.31 – Fault at Transmission

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