repeated b2161h code, but everything works

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Dec 23, 2025 | 03:13 PM

gonemad

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From: central NC

repeated b2161h code, but everything works

“brake lamp output” or something or other...

2024 FLHP police Road King

I’m running aftermarket LEDS all around, plus a Custom Dynamics Triple play module which flashes the brake light, and runs all three lamps in back in run/turn/brake mode.
Plus I added Harley OE fender tip lights, front and rear.

I’ve been running all this stuff for a few thousand miles, so not sure what the issue might be.

If everything is working, should I just ignore it?

Edit to add- These police bikes have some wonky auxiliary light modes both front and rear for duty use that have to be turned off in a prescribed manner so I don’t know if that convolutes the issue.

Last edited by gonemad; Dec 23, 2025 at 03:20 PM.

Dec 23, 2025 | 03:27 PM

GalvTexGuy

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The “h” means the code is no longer active and that whatever caused it has not returned. Have you tried clearing it?

Dec 23, 2025 | 04:03 PM

gonemad

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From: central NC

Quote:

Originally Posted by GalvTexGuy

The “h” means the code is no longer active and that whatever caused it has not returned. Have you tried clearing it?

three or four times. It clears each time, then I turn off the bike, turn it back on, operate all the lights, and then put it back in DIAG mode, no more code.

But I can take it out for a ride, stop, put it in DIAG mode, and the code returns.

Dec 23, 2025 | 04:13 PM

gonemad

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From: central NC

If it is just a historical code lurking in the BCM I think I’ll just ignore it.

Dec 23, 2025 | 04:55 PM

GalvTexGuy

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It thinks the brake lamp output is open. What’s got me stumped is it’s an historical code and it keeps coming back as historical after you’ve cleared it. I would tell you a load resistor would cure it, but I’m not sure it will or not.

Dec 23, 2025 | 05:11 PM

gonemad

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From: central NC

Quote:

Originally Posted by GalvTexGuy

One of the things that Custom Dynamics has customers do when they get the hyper flash on their turn signals after installing LEDS is to run the emergency flashers in a prescribed manner for about 30 seconds in order to sync everything. I think this is on CanBus bikes.

I would also have to do that periodically on my last bike that I’d swapped everything for LEDS, even after everything had been previously synced.

I have no idea if this has anything to do with what we are discussing.

Dec 24, 2025 | 01:08 PM

gonemad

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From: central NC

Rode 20 miles. Stopped and checked, no codes. Rode another 60 miles. Stopped, no codes.

I’ll consider this just the Ghost of Christmas past.

Merry Christmas!