2011 Odyssey EX-L - Check Charging System & Battery Light
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Thread: 2011 Odyssey EX-L - Check Charging System & Battery Light

  1. #1
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    2011 Odyssey EX-L - Check Charging System & Battery Light

    I'm pulling my hair out over this one. I haven't found a single person on the World Wide Web that shows to have had this problem. Hopefully, someone here on the forum knows what I need to do.

    Problem:

    Several weeks ago the "Check Charging System" message popped up on the information display, along with a glowing "battery" light.

    The van always starts, the battery has never gone dead and all other electrical systems work as they should.

    What I've tried so far:

    Had battery Load Tested several times, by different places. Even though it's 4 years old, it checks "Good".

    Had the alternator checked several times, by different places. Checked it myself with a DMM. It shows to be working fine.

    Replaced the ELD (electrical load detector). No change.

    Took van to Honda dealer. They do an ECU update and check for codes. No codes found. They say I "might" need a new alternator.

    Dealer wanted $1,100.00 to replace the alternator and no guarantee that it would solve the problem.

    Load tested both battery cables. They were fine.

    Removed alternator and had it bench tested, which showed it was good. Technician took it apart and replaced the voltage regulator and diodes for the rectifier.
    Still have the message and light.

    Had the battery tested by Interstate Battery today and after (3) simulated starts at the maximum Cold Cranking Amps, it was on the border-line of marginal & good.

    Went ahead and replaced the battery. No change.

    Did a Battery Cable Reset without any luck.

    This is our 14th Honda and 5th Odyssey and unfortunately, this is first one to ever have a problem and it's a doozy.

    Any ideas on what to do next, other than trade for a Sienna?

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  3. #2
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    Check the ground connections for corrosion.
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  4. #3
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    Quote Originally Posted by yakuza View Post
    Check the ground connections for corrosion.
    All ground connections are clean and tight.

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  6. #4
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    After it sits overnight, is the battery voltage around 12.6 volts?
    With the engine running, does it measure around 14v with most of the acc on, including seat heaters,lights, etc and at a fast idle?
    The two main grounding connections are from the bat (-) term to the frame and the other is from the frame (near the radiator top on the battery side) to the engine, at least on my '03.
    Course there are many more grounds scattered throughout.
    Tough to trouble shoot and I sure hope someone who had that problem has the answer and posts it.
    Buffalo4
    2003 EX-L
    168k miles orig tranny Oct 2015

  7. #5
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    Some with a similar problem posted,but unfortunately they never found the cause. Interesting read, and perhaps some hints.
    Check Charging System Light - Alternator/Battery Diagnostics Good.
    Just read your post of Apr 12 where you did test the voltage with the accessories on and the engine running and it sounded good.
    You also stated that one time your ABS and Traction Control indicators went on, but then stayed off after a reset. Probably a bad connection 'somewhere' causing all your problems.
    More searching on the Internet for one thing at a time may be helpful, esp if you can find a common cause.
    Just read your yesterday's post about the rebuilding of the alternator. http://www.odyclub.com/forums/54-201...-message.html\

    Well, post back with the result. Sad you are having such a problem, but at least it is driveable.

    Buffalo4
    2003 EX-L
    168k miles orig tranny Oct 2015

  8. #6
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    Did you ever find out the problem? My 2011 just had that same lights and message pop up

  9. #7
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    Quote Originally Posted by Babywagon View Post
    Did you ever find out the problem? My 2011 just had that same lights and message pop up
    Yes I did...It was the alternator.

  10. #8
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    Since:
    "Had the alternator checked several times, by different places. Checked it myself with a DMM. It shows to be working fine."
    "Removed alternator and had it bench tested, which showed it was good. Technician took it apart and replaced the voltage regulator and diodes for the rectifier.
    Still have the message and light."
    What finally happened that made you finally replace the alternator? A different test or did it finally just not work anymore?
    Any idea which part was the guilty party?
    Did you use a rebuilt, re-mfg,new aftermarket or an OEM alternator for the replacement?
    Thanks for any additional info and suggestions.
    Buffalo4
    2003 EX-L
    168k miles orig tranny Oct 2015

  11. #9
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    My apologies for not being more specific in my previous response.

    Specifically: After the voltage regulator & diodes were replaced in the alternator, the technician ran another bench test, which indicated the alternator was working correctly, just as it did before they rebuilt it. I reinstalled it and still had the trouble lights, so I called the repair shop. They had me remove it and bring it back in. In the meantime, the owner of the shop reached-out to a company who actually manufactures alternators, to see if they could offer some suggestions. What he found was my alternator, like many of the newer alternators, is a "smart" device. It is constantly communicating with the ECM and other computers on the vehicle. When they bench tested the alternator, after the rebuild, it basically screwed-up the communication pathway between the alternator and ECM. The manufacturer instructed him to replace the voltage regulator & diodes and install it back in the vehicle, without a bench test.

    It worked and everything is good!!!!

    Hope this helps.

  12. #10
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    Now that is interesting !!!!
    Thank you so much for that post.
    Buffalo4
    2003 EX-L
    168k miles orig tranny Oct 2015

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