Codes
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Stage III
Joined: Aug 2025
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Codes
Good morning looking for some help in where to look to try and fix the following codes B2121, B2122. Bike is currently trying to start when it’s shut off unless I unplug the wire to solenoid . Any help would be appreciated
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,186
Likes: 4,908
From: England
It is always very helpful to start with what the model and year of bike is.
Some bikes use a BCM that powers the solenoid directly and some use a starter relay.
The codes however are:
B2121 Starter output open
B2122 Starter output shorted high
Some bikes use a BCM that powers the solenoid directly and some use a starter relay.
The codes however are:
B2121 Starter output open
B2122 Starter output shorted high
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,186
Likes: 4,908
From: England
Some possibly very bad news is the BCM has gone wrong. The problem is the BCM is always powered even when you have switched off.
Get it properly diagnosed. The dealers should have a breakout box that if it works right should allow for the pin from the BCM to be isolated that would remove power from the wire.
Get it properly diagnosed. The dealers should have a breakout box that if it works right should allow for the pin from the BCM to be isolated that would remove power from the wire.
Last edited by Andy from Sandy; Sep 18, 2025 at 09:10 AM.
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