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Lowrance LCX-15MT Ihave used this unit as a echo sounder from new just purchased LGC 12w arial to use GPS as well but keeps coming up(GPS module not responding)

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Go to lowrance's website and run through their set up tutorial / instructions for the unit, there is also a software upgrade you can do online for the unit.

Posted on Oct 10, 2008


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Posted on Jan 02, 2017


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Does it have achart plotter

Out of the box, no. To get GPS/Mapping/chartplotting features, you have to hook up a separate LGC-12S 12-parallel channel GPS receiver/antenna device which is sold separately.

Mar 11, 2011 | Lowrance LCX-15MT GPS Receiver

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My Lowrance LCX-15MT GPS unit did power up, but acted funny for some time, Now it will not power up. Is there an internal clock type battery that would cause the unit not to reboot? I read that so many of...

batteries go flat with use
if it has a battery it will be replaceable
it is rechargeable it will have a plug jack for a charger
download the pdf user manual from the manufacturer site

Apr 18, 2017 | Lowrance LCX-15MT GPS Receiver

1 Answer

Lcx-15ct (gps module not responding)

Before you give up on the LGC-12S you have now though, try plugging the LGC-12S right into the LCX-15CT without an extension cable. If the module not responding goes just need a new extension (GPSX-25G p/n 99-46).

The power cable has a set of yellow, blue, orange, and bare data wires. If these wires short together, you can get the module not responding error.

If all that doesn't help...the LGC-12S is bad.

The LGC-12W p/n 112-06 will work with the LCX-15CT. You probably get this at many marine electronics dealers or go to and buy it straight from Lowrance. They cost $229 so you might want to shop around putting that money into a whole new system altogether.
Make sure you have the latest software updates if you get the newer LGC-12W. These can be downloaded at

Let me know if you need more help.

Jul 10, 2009 | Lowrance LGC-12S GPS Receiver GPS Receiver

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My Lowrance lcx-15mt backlight does not light up. I did not get help from the company, they do not make parts anymore. Is there a person or place that could fix this problem?

Just make sure your power is good and that all of the power connections are clean. Install software updates from if you don't already have the latest.

If all of that checks out, take the rebate letter that Lowrance will offer you since they can't fix it any longer and think about the new fishfinder you want to buy. They won't make you send that LCX-15 back so if it is usable at all you can still go with it.

There is no repair facility anywhere that will be able to fix this cheap enough for you. I guess you could check with some electronic repair shops and see if they could take a look, but most likely wouldn't be worth the'd be better off putting the money into a new unit.

Jun 25, 2009 | Lowrance LCX-15MT GPS Receiver

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Need a manual for my lowrance lcx marine gps combo

You're in luck! Visit =>

There are 3 manuals (pdfs). The first is the manual, the next two are addendums.

Please leave feedback. Thanks in advance.

Jan 03, 2009 | Lowrance LCX-15MT GPS Receiver

2 Answers

Gps module

I just went through this with Lowrance. tthe LGC 2000 module on my LCX 20 depth finder "quit responding" out of the clear blue. You have to go and they have some tests you can follow to see if it is a bad cable or the module itself. I had to replace the module. They charged $99 bucks plus $12.50 shipping for a new one. I bought it spring of 2008, and the unit was 3 months out of warranty when it quit working. Last season I had lower back fusion and didn't use it except for 2 times late in the season. Getting ahold of Lowrance is going to be an experience. I called twice and waited on hold over 35 minutes before I was suddenly cut off both times. I tried email too, but it took 3-5 days to receive a response. Mine broke down June 18 of this year. I started trying to get hold of Lowrance the next day. By the time all the back and forth emails with the delayed responses were done, I received my new unit on July 24. 5 weeks! with out my gps in MN. It is a short season up here as it is. I sure didn't enjoy waiting that long.

Oct 19, 2007 | Lowrance LGC-2000 GPS Unit GPS Receiver

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