When I spot lock, the motor turn to the right too far and beeps. Then comes out of spot lock. Very annoying. Need help. Thanks.

 

I did a search on it and came up with this based on your description:

 

AI Overview

 

Your Minn Kota Ultrex is likely malfunctioning due to either a calibration issue, a physical obstruction, or a faulty component, such as the internal control board or power steering module. 

 

Start by checking for obstructions or loose cables under the foot pedal and ensuring the power cable is not interfering with the steering. Next, try performing a sensor calibration by driving in two circles, then accessing the boat scale setting to reduce compensation if it's overcorrecting. If the issue persists, you may need to contact a service center to diagnose a potentially faulty control board or other internal parts. 

 

1. Check for Obstructions 

Under the Pedal:

Inspect the entire area under and around the foot pedal for anything that could be touching it, such as the pull cord, wires, or a bait.

Cables and Wires:

Ensure the power cord and other cables aren't getting snagged or creating resistance, as this can interfere with the motor's ability to steer and hold position.

This video demonstrates how to check for obstructions and loose cables around the foot pedal of a trolling motor:

 

2. Recalibrate the System 

Sensor Calibration: The motor's internal compass needs to be calibrated for it to know what is "forward".

Access the system settings on your remote or via the Minn Kota app.

Find the "Sensor Calibration" or "Sensor Cal" option and start the process.

Drive the boat in two complete circles to complete the calibration.

 

3. Adjust the Boat Scale 

Reduce Compensation: If your boat is consistently overcorrecting and turning too far, the motor might be overpowered for the conditions.

In the system settings, find the "Boat Scale" option.

Adjust it to a lower setting, such as a "negative one" (-1).

4. Inspect Wiring and Connections 

Loose Connections: Check all wiring connections, particularly between the control head and the motor itself, for any signs of corrosion or looseness.

5. Check for Malfunctioning Internal Components

Control Board/Power Steering Module:

If the above steps don't work, the issue could be a failing control board or the power steering module. 

Professional Help:

These components may need professional diagnostic testing or replacement. Take your motor to an authorized service center to have the internal components checked. 

I have had that happen with my Ultrex a few times when something stops the foot pedal from turning.  For example of something is under the foot pedal that prevents one side of it from going all the way down.