Is your Side Imaging (SideScan for Lowrance, SideVu for Garmin) sonar not working correctly or showing up? Well, you are in luck because this is a fairly common problem many anglers will encounter. There are many solutions for each problem that can arise, and we will discuss them in this article.
Common Issues with Fish Finder Side Imaging
Display Screen Not Showing Image
This issue can be caused by a variety of factors such as low battery power, incorrect settings, or a problem with the transducer. If the screen is blank, it is important to check the power source and settings first before considering any other potential issues.
Image Distortion or Interference
This issue can be caused by a variety of factors such as electrical interference from other devices on the boat, a weak signal from the side imaging transducer, or a problem with the software. It is important to check for sources of electrical interference and to make sure the transducer is securely attached and functioning properly.
Side Imaging Not Working at All
This issue can be caused by a variety of factors such as a malfunctioning transducer, incorrect settings, or a problem with the software. It is important to check the transducer connection, settings, and software updates to determine the cause of the problem.
Inconsistent Performance
This issue can be caused by a variety of factors such as changes in the water conditions, a weak signal from the transducer, or a problem with the software. It is important to monitor the performance of the device regularly and make necessary adjustments or perform software updates as needed to ensure consistent performance.
Side Imaging only works on one side

If the outboard engine is positioned too close to the transducer, it can obstruct the sonar signals and cause interference. It is important to position the engine in a way that does not obstruct the transducer and to make sure that the transducer is not being obstructed by any other components of the boat.
Try trimming the engine to see if that improves the display. You can trim the motor up, and the display would improve on the side that is not working. You will immediately start seeing the structures and bottom with more clearly.
Basic Troubleshooting Steps
Checking the Power Source
The first step in troubleshooting a fish finder with side imaging technology is to check the power source. Make sure that the battery is charged or that the device is connected to a power source. If the power source is not the issue, then move on to the next step.
Checking the Transducer Connection
The transducer is the component that sends and receives the sonar signals. If the connection is loose or if the transducer is not functioning properly, the side imaging feature may not work. It is important to inspect and ensure the transducer is correctly installed.
Checking for Software Updates
Software updates can resolve many issues with fish finders with side imaging features. It is important to regularly check for software updates and to install any available updates to ensure the device is functioning properly.
Performing a Factory Reset
A factory reset can resolve many issues with fish finders with side imaging technology. This involves resetting the device to its original settings and can be performed by following the instructions provided by the manufacturer. If all other troubleshooting steps have been exhausted and the device is still not working properly, a factory reset may be necessary.
Advanced Troubleshooting
Checking for Underwater Debris near the Transducer
Underwater debris can obstruct the sonar signals and cause interference. It is important to check the area near the transducer for any debris and to remove it if necessary.
Checking the Transducer Cable for Damage
The transducer cable can become damaged over time or if it is not handled properly. If the cable is damaged, it can cause the side imaging feature to not work properly. It is important to inspect the cable for any damage and to replace it if necessary.
Checking the Transducer Frequency
Side imaging transducers typically operate at higher frequencies, typically above 500 kHz. The frequency determines the range and clarity of the sonar signals, with higher frequencies providing better detail but shorter ranges.
To check and adjust the frequency settings, consult the owner’s manual for your specific device, as the steps may vary depending on the model.
Most fish finders have a menu system that allows you to view and change the frequency settings. If the frequency is incorrect, it can cause the side imaging feature to not work properly, so it is important to check and make any necessary adjustments.
Calibrating the Side Imaging Unit
Calibrating the side imaging unit is the process of adjusting the settings to ensure the device is functioning properly and providing accurate images. The calibration process may include adjusting the angle of the transducer, adjusting the sensitivity settings, and checking for correct operation.
It is important to calibrate the side imaging unit because small variations in the angle of the transducer, the sensitivity settings, or other factors can result in distorted or incorrect images. Calibration helps to ensure that the device is providing the most accurate and useful information possible.
The steps for calibrating the side imaging unit can vary depending on the specific device but may include adjusting the angle of the transducer, adjusting the sensitivity settings, and performing a test run to check for correct operation. It is important to refer to the manufacturer’s instructions for information on how to calibrate your specific device. Some devices may have an automatic calibration feature, while others may require manual adjustment.
Outboard Engine Obstructing Sonar Signals

It may be necessary to adjust the position of the transducer or move the outboard engine to a different location. If the transducer is positioned too close to the engine, it may be necessary to reposition it to a location that is farther away from the engine.
In some cases, adjusting the angle of the transducer or calibrating the device may also help to correct the issue.