Troubleshooting Bobcat S175 Error Code SHUTDN 39.0

[MikePhua]

The Bobcat S175 skid steer loader is a versatile and powerful machine used in various construction, landscaping, and agricultural applications. However, like any complex piece of machinery, it is prone to occasional issues, including error codes that indicate specific problems. One such error is the SHUTDN 39.0 code, which can cause the machine to shut down unexpectedly.
In this article, we will explore what the Bobcat S175 error code SHUTDN 39.0 means, how to troubleshoot it, and potential solutions to get the machine back up and running efficiently. By understanding the underlying causes of this error, operators can better maintain their equipment and avoid costly downtime.
Understanding the SHUTDN 39.0 Error Code
The SHUTDN 39.0 error code on a Bobcat S175 generally signals a shutdown condition triggered by the machine’s electrical system or safety sensors. This code is part of the machine’s diagnostic system, designed to protect the engine and critical components from damage. It typically indicates that the engine control module (ECM) has detected a fault that requires the machine to shut down to prevent further damage.
Here’s a breakdown of the two most common causes of this error:

1. Electrical Issues
   • The most common cause of the SHUTDN 39.0 code is a malfunction in the electrical system. This can be due to a battery problem, bad connections, or faulty wiring. Any disruption in the flow of electricity to critical components can trigger the error code.
     
   • Other issues related to the electrical system, such as a blown fuse or faulty alternator, can also result in this error.
     
2. Sensor Malfunctions
   • The Bobcat S175 has numerous safety sensors that monitor various aspects of the machine, including engine temperature, fuel pressure, and hydraulic fluid levels. A failure or malfunction in one of these sensors can cause the SHUTDN 39.0 code to appear, as the ECM interprets it as a potential safety issue.
     
   • For example, a malfunctioning oil pressure sensor could trigger the error if the sensor sends faulty readings to the ECM, signaling a problem where there may be none.
     

Troubleshooting Steps for SHUTDN 39.0
If the Bobcat S175 displays the SHUTDN 39.0 error code, the following steps can help troubleshoot and resolve the issue:
1. Check the Battery and Connections

• The first step in troubleshooting any electrical error is to inspect the battery and all related connections. A weak or dead battery can prevent the machine from starting properly and trigger the shutdown error.
  
• Inspect the battery terminals for corrosion or loose connections. Clean the terminals if necessary, and ensure that the connections are tight and secure.
  
• If the battery is old or not holding a charge, consider replacing it with a new one. It’s also a good idea to check the alternator to ensure it is properly charging the battery while the machine is running.
  

2. Inspect Fuses and Relays

• A blown fuse or a faulty relay could interrupt the flow of electricity to the key systems. Check the machine’s fuse box for any blown fuses or damaged relays.
  
• If you find any blown fuses, replace them with the correct type and rating. Be sure to check the machine’s manual for the appropriate fuse ratings.
  

3. Check the Safety Sensors

• Next, inspect the various safety sensors on the machine. These sensors monitor vital functions like oil pressure, coolant temperature, and hydraulic fluid levels.
  
• Pay special attention to the oil pressure sensor, as a malfunctioning sensor could easily trigger the SHUTDN 39.0 error code.
  
• If you suspect a faulty sensor, it may need to be replaced or recalibrated. Check the connections to the sensors to ensure there are no loose wires or damage that could affect performance.
  

4. Inspect the Wiring

• Carefully inspect the wiring harness for signs of wear, corrosion, or damage. If any wires are frayed, broken, or exposed, they may cause electrical disruptions that lead to error codes.
  
• If you notice damaged wiring, repair or replace the affected components as necessary.
  

5. Reset the Machine

• After performing the above checks, try resetting the machine. To do this, turn off the machine, wait for a few minutes, and then restart it.
  
• Sometimes, simply resetting the machine’s computer system can clear the error code and restore normal operation, especially if the issue was related to a temporary electrical fault.
  

Possible Causes and Solutions
Let’s look at some of the most common causes of the SHUTDN 39.0 error code and how to address them:

1. Battery Failure:
   • Cause: The battery is weak or dead, preventing the machine from receiving the power it needs to operate.
     
   • Solution: Replace the battery with a fully charged or new one. Clean and tighten all battery connections to ensure proper electrical flow.
     
2. Faulty Safety Sensor:
   • Cause: A faulty safety sensor, such as an oil pressure or temperature sensor, sends incorrect readings to the ECM, triggering the shutdown.
     
   • Solution: Inspect and replace the malfunctioning sensor. Ensure that all sensor wiring is intact and free from damage.
     
3. Blown Fuses or Faulty Relays:
   • Cause: A blown fuse or faulty relay disrupts electrical flow to key components, causing the machine to shut down.
     
   • Solution: Check the fuses and relays and replace any that are blown or malfunctioning.
     
4. Wiring Issues:
   • Cause: Damaged or worn wiring can cause electrical faults, leading to shutdowns and error codes.
     
   • Solution: Inspect the wiring harness and replace any damaged wires. Repair any loose connections or exposed wires.
     
5. ECM or Software Issues:
   • Cause: In rare cases, the ECM or machine software may malfunction, resulting in erroneous error codes.
     
   • Solution: If all hardware components seem functional, consider updating the machine’s software or resetting the ECM to clear any glitches.
     

Preventive Maintenance Tips
To avoid encountering the SHUTDN 39.0 error code in the future, it’s essential to follow proper maintenance procedures for the Bobcat S175. Regular maintenance will not only help prevent this specific issue but also extend the life of the machine and improve its overall performance.

1. Regular Battery Checks: Inspect the battery and its connections at regular intervals. Keep the terminals clean and check for corrosion or loose connections.
   
2. Sensor Calibration: Ensure that all safety sensors are calibrated correctly and replaced if they show signs of wear or malfunction. This is especially important for oil pressure and coolant temperature sensors.
   
3. Electrical System Inspections: Routinely inspect the wiring harness and check for any signs of wear, corrosion, or damage. Ensure all connections are secure and intact.
   
4. Fuse and Relay Checks: Periodically inspect the fuses and relays to ensure they are in good working condition. Replace any that are damaged or worn.
   
5. Software Updates: Stay up to date with any software or firmware updates from Bobcat, as these can improve the machine’s performance and resolve minor glitches in the system.
   

Conclusion
The Bobcat S175 error code SHUTDN 39.0 typically signals a critical issue with the electrical system or safety sensors, causing the machine to shut down for safety. By carefully following the troubleshooting steps outlined above, operators can quickly identify the root cause of the problem and take the necessary steps to resolve it. Regular maintenance and attention to the electrical system, sensors, and wiring can also help prevent this error from recurring, ensuring that the Bobcat S175 remains a reliable and efficient tool on the job site.