I have a 22 fatboy. Getting a p1608 low battery code. Just replaced battery a week ago. I checked cables they are nice and tight. Any thoughts

steve

 

Did the code appear before or after you replaced the battery? Also, is that a c or an h code?

 

I replaced the battery a couple of weeks ago . Everything seemed fine . I rode it today and after about 30 miles the speedometer quit working. the battery light came on. I made it home and checked the battery connections all fine . The battery died so I put it on trickle charger for a bit. The bike started right up I turned it off and it won’t start now. Strange

 

If you want some help, it makes it a lot easier for people if you answer their questions.

 

Sounds like you got unlucky and got a bad replacement battery. Take it out and return it.

 

How many CAN bus M8 bikes with battery troubles have you personally diagnosed and repaired?

 

1. Did you fully charge the new battery before installing it?
2. Using a Volt Ohm Meter (VOM), what is the voltage reading of the battery installed at rest without the ignition turned on.
3. Using a VOM, what is the voltage reading with the ignition turned on and the bike not running.
4. Using a VOM, what is the voltage reading while the bike is running.
5. Using a VOM, what is the voltage reading when starting the bike with a fully charged battery.

Answer these questions and report back.


NOTE:
The above information, while credible, is worth what you paid for it and should not be considered gospel.
Do due diligence, research and have a H-D Field Service Manual before working on your bike.
You will probably have many opinions and suggestions presented; make sure you research the person providing the helpful information as there are some who provide good information that is useful and some who speak out of other orifices with gibberish. You will figure out this quickly.

 

Focus on the OP. I start simple at the logical choice especially since it doesn't appear he has a volt/ohm meter. He checked the wires for being tight. And he didn't bother to answer your question.

• Potential Causes of a P1608.
  This can be due to a faulty battery current sensor, a wiring issue (open or short circuit), a loose connector, or a failing battery.

Now if the dealer who sold him the battery charges it more then a few minutes and puts it on a good test machine that can test these small bike batteries and the dealer says it's good, my suggestion then to the OP is take the bike to a Harley dealership.

A BCM (Body Control Module) replacement is generally not a "plug and play" swap in modern Harleys. BCMs are typically programmed to the specific bike and require specialized tools and procedures for installation

 

Focus on facts. Don't guess.

Actual experience will beat a Google/AI search every time.

 

Sorry, I wasn't finished, so it was necessary to quote myself. The BCM for his FatBoy is $400. I'm still listening for you to walk him thru this repair.

I am always willing to learn from an expert.