John Deere SPN Codes(A to Z Codes)

John Deere equipment is known for its reliability and performance, but like any complex machinery, it can encounter issues from time to time.

When such issues arise, the SPN (Suspect Parameter Number) codes can provide valuable information to diagnose and address the problem efficiently.

We’ll delve into the world of John Deere SPN codes, providing you with in-depth insights, troubleshooting tips, and expert advice based on first-hand knowledge and credible sources.

Let’s jump in.

John Deere SPN Codes

Before we dive into the details, let’s start by understanding the basics of John Deere SPN codes.

These codes are part of the SAE J1939 standard and are used to communicate specific diagnostic information about various systems within John Deere equipment.

SPN codes comprise three parts: the Suspect Parameter Number, the Failure Mode Identifier, and the Occurrence Count.

SPN CodeMeaning
SPN 51Engine Throttle Position
SPN 84Wheel-Based Vehicle Speed
SPN 91Accelerator Pedal Position
SPN 94Fuel Delivery Pressure
SPN 100Engine Oil Pressure
SPN 106Engine Coolant Temperature
SPN 107Engine Coolant Level
SPN 110Engine Coolant Temperature, Circuit Failed Low
SPN 111Engine Coolant Temperature, Circuit Failed High
SPN 120Oil Level
SPN 123Engine Speed
SPN 129Barometric Pressure
SPN 135Oil Control Valve Position
SPN 137Engine Retarder Oil Pressure
SPN 138Engine Retarder Solenoid Voltage
SPN 141Wheel-Based Vehicle Speed, Sensor Calibration
SPN 157Cruise Control Enable Switch
SPN 158Cruise Control Set Switch
SPN 159Cruise Control Coast (Decelerate) Switch
SPN 160Cruise Control Resume Switch
SPN 161Cruise Control Accelerate Switch
SPN 165Engine Exhaust Gas Recirculation Temperature
SPN 167Engine Exhaust Gas Recirculation System Pressure
SPN 190Engine Speed Derate
SPN 2623Engine Exhaust Gas Recirculation Valve Control
SPN 305Battery Voltage
SPN 351Transmission Gear Selection Not Available
SPN 433Calibration Level Error
SPN 523Wheel-Based Vehicle Speed Not Available
SPN 524Wheel-Based Vehicle Speed Sensor Calibration Error
SPN 636Wheel-Based Vehicle Speed Erratic
SPN 655Accelerator Pedal Position 1
SPN 656Accelerator Pedal Position 2
SPN 657Accelerator Pedal Position 3
SPN 658Accelerator Pedal Position 4
SPN 659Accelerator Pedal Position 5
SPN 660Accelerator Pedal Position 6
SPN 661Accelerator Pedal Position 7
SPN 737Idle Shutdown Timer Active
SPN 738Engine Oil Filter Restriction Switch
SPN 739Engine Fuel Filter Restriction Switch
SPN 833Coolant Level Low – Condition Exists
SPN 834Coolant Level Low – Critical Level
SPN 851Data Link Fault
SPN 852Data Link Fault, PLC Timeout
SPN 859Wheel-Based Vehicle Speed Sensor Signal Abnormal
SPN 876Fuel Compensation Pressure
SPN 918Engine Extended Cranking
SPN 951Engine Protection Torque Derate
SPN 970Engine Starter Relay
SPN 971Engine Auxiliary Shutdown Switch
SPN 1231Brake Pedal Switch Circuit
SPN 1237Transmission Control Lever Not in Neutral Position
SPN 1438Wheel Speed Sensor Supply Voltage 1
SPN 1442Wheel Speed Sensor Supply Voltage 2

Check out the full SPN list Here

Decoding John Deere SPN Codes

Interpreting SPN codes correctly is crucial for effective troubleshooting. In this section, we’ll guide you on how to decode John Deere SPN codes step-by-step, enabling you to understand the root cause of the issues your equipment might be facing.

Common John Deere SPN Codes and Their Meanings

Explore this section to discover some of the most common SPN codes that John Deere equipment owners encounter. We’ll provide a comprehensive list of these codes along with their meanings, giving you a handy reference for quick diagnosis.

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Diagnostic Tools for John Deere SPN Codes

Having the right diagnostic tools can make a significant difference in dealing with SPN codes effectively. Here, we’ll discuss the various diagnostic tools available for John Deere equipment, helping you choose the ones that best suit your needs and budget.

Preventive Maintenance: Reducing the Occurrence of SPN Codes

Prevention is better than cure, and this holds true for John Deere equipment as well.

Learn about essential preventive maintenance practices that can reduce the likelihood of encountering SPN codes, ensuring smooth operation and increased longevity.

Troubleshooting John Deere SPN Codes

When an SPN code appears, it’s essential to tackle the issue systematically. This step-by-step troubleshooting guide will walk you through the process of identifying the problem’s source and implementing the right solutions.

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Addressing John Deere SPN Codes: DIY vs. Professional Assistance

It’s appropriate to handle SPN codes yourself, but when it’s best to seek professional assistance, While some issues are manageable with basic knowledge, others require the expertise of trained technicians.

The Role They Play in SPN Codes

Understanding LSI (Latent Semantic Indexing) keywords can improve your overall comprehension of SPN codes. Learn how LSI keywords relate to John Deere equipment and SPN codes, aiding in more effective troubleshooting.

Common Mistakes to Avoid When Dealing with SPN Codes

Mistakes can lead to wasted time and resources when addressing SPN codes. Be aware of common errors others make and how to avoid them, ensuring your efforts are focused on the right areas for resolution.

Tips for Quick SPN Code Diagnosis

Time is of the essence when dealing with equipment issues. Here, we’ll share expert tips for speeding up the diagnosis of SPN codes, enabling you to get your John Deere equipment up and running in no time.

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John Deere SPN Codes: Exploring Advanced Topics

As you become more familiar with SPN codes, you may want to explore advanced topics that delve deeper into the intricacies of John Deere equipment diagnostics. This section will provide you with resources and references for further study.

External Links: Additional Resources for John Deere SPN Codes

Find a curated list of external links to reputable websites, including John Deere’s official resources and other valuable references. These links will enhance your knowledge and expertise in handling SPN codes effectively.


What are SPN codes, and why are they essential to John Deere equipment?

SPN codes are Suspect Parameter Numbers used for diagnostic purposes in John Deere equipment. They play a crucial role in identifying specific issues within the machinery, and helping owners and technicians pinpoint problems accurately.

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How do I interpret John Deere SPN codes?

Interpreting SPN codes involves understanding the Suspect Parameter Number, the Failure Mode Identifier, and the Occurrence Count.

These components combine to provide valuable information about the equipment’s condition and potential issues.

Can I troubleshoot SPN codes myself, or should I seek professional help?

While some simple issues can be tackled by equipment owners with basic knowledge, more complex problems may require professional assistance.

It’s essential to assess your capabilities and the complexity of the issue before deciding to troubleshoot yourself.

Are preventive maintenance practices effective in reducing SPN codes?

Yes, preventive maintenance can significantly reduce the occurrence of SPN codes. Regularly inspecting and servicing your John Deere equipment will help identify and address potential issues before they escalate into larger problems.

What are LSI keywords, and how do they relate to SPN codes?

LSI keywords are related terms that help search engines understand the context and relevance of content. In the context of SPN codes, LSI keywords can enhance your understanding of diagnostic processes and equipment functionality.

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Can I rely solely on diagnostic tools for addressing SPN codes?

Diagnostic tools are essential, but they are only part of the equation. Combining the data from these tools with technical expertise and a methodical troubleshooting approach will yield the best results in addressing SPN codes.

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Final Remarks

Understanding John Deere SPN codes is fundamental for any equipment owner or technician.

By decoding these codes, addressing issues promptly, and implementing preventive measures, you can ensure your John Deere equipment operates at its best.

Remember that while some problems are simple to handle, others may require professional assistance for a seamless resolution.

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George Bill
George Bill

George Bill is a Mechanical Engineer by Profession and an avid gardener and has been mowing his lawn for over 20 years. He has used a variety of different mowers during this time.
George is an expert at maintaining his mowers and over the years, he has learned many tricks and techniques for getting the best results from his mowers and is always happy to share his knowledge on this site.