What's This Code Mean? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 8 (permalink) Old 05-24-2016, 03:29 PM Thread Starter
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What's This Code Mean?

Went to start my bike after riding about 1/2 hour, and I get NOTHING from the starter button. Like I don't even have the key on. Bike was running fine, then this. I have lights and battery cables are nice and tight. I'm getting fault code B2121. What does this mean? Solution? Thanks!
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post #2 of 8 (permalink) Old 05-24-2016, 03:35 PM
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Went to start my bike after riding about 1/2 hour, and I get NOTHING from the starter button. Like I don't even have the key on. Bike was running fine, then this. I have lights and battery cables are nice and tight. I'm getting fault code B2121. What does this mean? Solution? Thanks!
B2121 Starter Output Open/BCM Malfunction
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post #3 of 8 (permalink) Old 05-24-2016, 04:20 PM
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Check for blown ignition system fuse.

I had a wire with pinched insulation inside the right switch housing, causing that fuse to blow.

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post #4 of 8 (permalink) Old 05-24-2016, 09:54 PM Thread Starter
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Well, the bike is still under warranty, so the dealership has it now. Wonder how long before they figure it out?
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post #5 of 8 (permalink) Old 08-16-2019, 01:59 AM
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hi i have the same issue now. B2121 code and bike wont start. new battery in place. please help if can got any answer.
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post #6 of 8 (permalink) Old 08-16-2019, 05:39 AM
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Well, the bike is still under warranty, so the dealership has it now. Wonder how long before they figure it out?
If they are a Good Dealership shouldn't take more than a few hours considering it may need some wire tracing to fix it ..

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post #7 of 8 (permalink) Old 08-16-2019, 07:56 AM
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hi i have the same issue now. B2121 code and bike wont start. new battery in place. please help if can got any answer.
Try pulling the maxi-fuse for a couple minutes, that'll reboot the system.

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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post #8 of 8 (permalink) Old 08-21-2019, 09:58 AM Thread Starter
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Well, with my bike, the dealer had it for over three weeks..........replaced battery.....next day same thing....replaced ignition switch....two days later......same thing....replaced starter....that worked for about 3 days......they could not figure out the problem....finally , I guess they got tired of coming to get the bike from wherever it left me stranded and trailering it back to the dealers,, and they just replaced the ENTIRE starting system, everything from switches to fuses.....that solved the problem, but dealer still has no idea what it was. Luckily it was all done under warranty. I've since traded the bike.
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