P1608 code
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Intermediate
Joined: Jan 2023
Posts: 32
Likes: 7
From: Mississippi
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 wont start now. Strange
Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,142
From: Las Vegas
How many CAN bus M8 bikes with battery troubles have you personally diagnosed and repaired?
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,419
Likes: 30,640
From: Pennsylvania
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.
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.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 38,293
Likes: 6,322
From: Honah Lee
- 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.
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
Last edited by Jackie Paper; May 15, 2025 at 09:33 AM.
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Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,142
From: Las Vegas
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.
Actual experience will beat a Google/AI search every time.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,293
Likes: 6,322
From: Honah Lee
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.
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
- 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.
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
I am always willing to learn from an expert.
Last edited by Jackie Paper; May 15, 2025 at 09:43 AM.
