John Deere Fault Codes List (Everything Revealed)

Whether you’re a seasoned farmer or a new tractor owner, understanding your machine is crucial for efficient operation and maintenance.

One of the keys to mastering your John Deere tractor is understanding its fault code list. 

These codes are integral to diagnosing and resolving potential issues that affect your machine’s performance. From Engine Control Unit (ECU) codes to Transmission Control Unit (TCU) codes, each has a specific meaning that can help you troubleshoot problems swiftly and effectively. 

In this blog post, I’ll explore the John Deere Fault Code List in detail, providing the knowledge you need to keep your tractor running smoothly.

Types of John Deere Fault Code 

John Deere tractors are known for their advanced technology, including an intricate system of fault codes designed to alert the operator about potential issues. 

Here’s a brief guide to understanding these fault codes:

1. ECU Fault Codes – Engine Control Unit Fault Codes

These codes are related to the engine control unit (ECU). The ECU controls the fuel injection system, ignition timing, and other functions necessary to run the engine. 

If there are any issues with these systems, the ECU will generate a fault code to help diagnose the problem.

2. ACU Fault Codes – Armrest Control Unit Fault Codes

ACU fault codes pertain to the Armrest Control Unit. This system is responsible for many controls and displays on the operator’s armrest. 

If there’s a malfunction in these components, the ACU will generate a fault code.

3. BCU Fault Codes – Basic Control Unit Fault Codes

BCU fault codes involve the Basic Control Unit, which oversees the basic functioning of the tractor. Any disruptions in the normal functioning of the tractor will trigger the BCU to produce a fault code.

4. DCU Fault Codes – Diagnostic Control Unit Fault Codes

The Diagnostic Control Unit (DCU) monitors the overall health of the tractor. It diagnoses issues across all systems and provides fault codes that can pinpoint the source of a problem.

5. TCU Fault Codes (Transmission Control Unit Fault Codes)

TCU fault codes are related to the Transmission Control Unit, which manages the transmission system.

If there are any problems with the gears or the operation of the transmission, the TCU will provide a fault code.

Bottom Line: Understanding these fault codes can greatly simplify troubleshooting and maintenance.

When a fault code appears, refer to your John Deere operator’s manual or consult a qualified technician to understand the code’s meaning and how to address the issue. 

Remember, preventive maintenance is key to avoiding major problems and ensuring the longevity of your John Deere tractor.

Also Read: John Deere 100 Series Transmission Problems – Fixed!

Control Unit	Fault Codes	Description	Troubleshooting Steps
ECU	000100.18	Low engine oil pressure.	– Check the oil pressure and add oil if necessary.
	000110.00	High engine coolant temperature.	– Inspect the coolant level and radiator fins.
	000190.00	High engine speed.	– Verify the ignition and cooling systems. Adjust fuel pressure if required.
	000627.01	Voltage issues in electronically controlled injectors.	– Examine the injector circuit and replace any damaged wiring.
ACU	000158.04	Malfunctioning rear PTO.	– Check transmission oil, wires, and terminals. Clean corrosion if present.
	000177.17	Low transmission fluid level.	– Add sufficient fluid and monitor the temperature until the proper hydraulic oil level is reached.
	000974.20	Voltage problems in the hand throttle circuit.	– Inspect the circuit for shorts or loose connections. Replace faulty sensor if needed.
BCU	000070.31	Faulty handbrake.	– Troubleshoot the handbrake mechanism and resolve the issue.
	000084.02	Circuit malfunction.	– Inspect the circuit for faults and replace damaged components.
	000168.16	High voltage during engine operation.	– Check the voltage regulator and adjust it as necessary.
TCU	304020.02	Signal transmission malfunctions.	– Replace transmission fluids and solenoids if required. Adjust throttle cables.
	304019.05	Clutch pedal sensor problem.	– Use a multimeter to diagnose the clutch pedal circuit and seek professional assistance.
	304050.04	A grounded circuit in channel 1.	– Inspect the circuit for grounding issues with expert guidance.

Please note that the troubleshooting steps provided are general suggestions, and it is advisable to consult the official documentation or a John Deere technician for specific instructions related to each fault code.

Also Read: John Deere Z665 Problems (How To Fix Them Immediately)

Frequently Asked Questions (FAQs)

Are all John Deere fault codes easily resolvable?

While many John Deere fault codes can be resolved with the appropriate knowledge and tools, some may require assistance from a professional technician.

The complexity of the resolution varies depending on the specific code and the system it relates to.

Refer to your operator’s manual or consult a qualified technician to help resolve a specific fault code.

What are the common fault codes for the John Deere engine control unit (ECU)?

The common fault codes for the John Deere Engine Control Unit (ECU) deal mostly with fuel injection and ignition timing systems.

These codes are integral in maintaining the health of the engine.

Specific codes will vary based on model and engine type, so it’s important to refer to your operator’s manual for a detailed list.

How can I retrieve John Deere’s engine codes?

Retrieving John Deere engine codes usually involves using the display panel on the tractor. Most models provide a process for viewing active and stored codes.

For specific instructions, refer to your tractor’s operator’s manual. In some cases, specialized diagnostic equipment may be required to read certain codes.

Conclusion

Understanding John Deere Fault Codes is essential for proper tractor maintenance and operation. 

These codes provide crucial insights into the health of your machine, enabling timely troubleshooting and resolution of issues. 

From ECU to TCU, each code has a specific meaning that can guide you in diagnosing problems. 

So, keep your operator’s manual handy and stay informed about these fault codes to ensure your John Deere tractor’s longevity and optimal performance.