Hellcat going into battery save mode?

Discussion in 'Dodge Challenger SRT Hellcat' started by skylane765, May 14, 2015.

  1. skylane765

    skylane765 Silver Member Hellcat Supporting Vendor

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    when driving at times the hellcat goes into battery saving mode and radio shuts off. I see that the voltage is all good 14.2 volts. If I stop and restart the alert goes away. The battery light also lights up. Anyone have this happen?
     
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  2. B5 Blue

    B5 Blue Platinum Member

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    Does it store any codes? Use steering buttons
    Push and release the UP or DOWN arrow button until
    the diagnostic Menu is selected. Then, the Driver is able
    to view engine and emission vehicle faults.

    When you say 14.2 volts is that what it read while indicator was on?
     
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  3. Hubbs

    Hubbs Silver Member

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    That's really weird....doesn't sound normal.
     
  4. skylane765

    skylane765 Silver Member Hellcat Supporting Vendor

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    No codes. Checked that. Also it is charging?? It does it only once in awhile.
     
  5. Mopar_Convert

    Mopar_Convert Hellcat Member

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    Check your battery connections - they might be loose, someone else had an issue similar.
     
  6. skylane765

    skylane765 Silver Member Hellcat Supporting Vendor

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    Yes 14.2 v normal. And when in battery saver mode 14.2. Sounds like a SW issue.
     
  7. fnkychkn

    fnkychkn swollen member Gold Supporting Member

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    possible IBS (intelligent battery sensor) issue. IBS is mounted to battery negative terminal and monitors current flow into and out of the battery, as well as battery temperature, state of charge and state of health. this information is used by the PCM (powertrain control module) to control the charging system and by the BCM (body control module) to control load shedding functions.
     
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  8. SRT_HC_707

    SRT_HC_707 SRT_HC_707 Staff Member

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    Do you know if IBS on these is anything like BMW. On BMW vehicles the type of battery (wet or gel) and the amperage needs to be coded to the car. You also have to reset when a new battery is installed. The IBS needs this info. for best battery life. If the battery is new I believe it let's it discharge a bit more before charging and then the type and amperage also plays a factor.

    For this reason I always use an OE battery and do the coding. Wonder if the Hellcat requires all this or if you can just change out a battery when needed like the 'good old days'.
     
  9. fnkychkn

    fnkychkn swollen member Gold Supporting Member

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    it resets whenever the battery is disconnected/reconnected.

    from online database article:



    When the IBS is powered up for the first time or is powered after a power disconnection, it enters a "recalibration" phase, where the IBS must recognize the type of battery and its characteristics and state. So in this phase the tolerances on the state functions (SOC, SOF, SOH) are greater than in normal working condition.

    Information the Intelligent Battery Sensor (IBS) send out on the CAN Bus is:

    SOC
    = Battery state of charge (or SOC) is expressed as a percentage. The IBS calculates the SOC based on measured voltage, and charge and discharge rates. Therefore, SOC is not a direct percentage of battery voltage.

    SOH = Battery state of health (or SOH) is the percentage of actual battery capacity compared to the nominal capacity of the battery. As the battery ages and wears, its capacity declines.

    SOF = Battery State of Function: Battery state of function (or SOF) is a calculated prediction of the lowest voltage the battery will drop to during engine cranking.


    When IBS is disconnected from the battery, the device loses its stored memory. When power is restored, the IBS starts a relearn process. Until the relearn process is complete, accurate battery state information is unavailable to other vehicle systems. The IBS relearn process requires two -five normal, operator initiated starts with at least eight hours of engine off time between each start. Usually, the process takes a few days of vehicle operation to complete.
     
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  10. SRT_HC_707

    SRT_HC_707 SRT_HC_707 Staff Member

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    Thanks fnkychkn I really appreciate all the information you provide.

    I wonder in this scenario how it knows the type of capacity of the battery and the technology (gel or wet) or if it just assumes OE. I wouldn't think you can really determine this from a sensor but I don't really know for sure.
     
  11. B5 Blue

    B5 Blue Platinum Member

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    Damn you're saying it has what Audi calls a BEM. Do you have readout capabilities from it that lists shutdown stages, last xx drive cycles, current draw (no key on 15 power etc.? Does the battery itself have a serial # that needs to be entered? Bosch makes Audi's do you know who makes Dodge's. Sorry for being long winded but I wrote the book on diagnosis on these for Audi.
     
  12. SRT_HC_707

    SRT_HC_707 SRT_HC_707 Staff Member

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    Hey B5 Blue I'd love to see that book or is it one of these things you can show me but then you have to promptly kill me and take my Hellcat LOL. Good info. for wifey's S5
     
  13. B5 Blue

    B5 Blue Platinum Member

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    Unless you can get into the 19 module with a scan tool (Rosstech will work) and read all the data from the BEM then I can't help me let alone you. And if you did I would have to decipher it for you. Germany doesn't know how it works and I had to argue with them on their shortcomings.
     
  14. SRT_HC_707

    SRT_HC_707 SRT_HC_707 Staff Member

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    Yup, I have Rosstech.... Can't own one of these cars without it IMO. I'll keep that in mind if I ever have issues... Thanks.
     
  15. B5 Blue

    B5 Blue Platinum Member

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    Then hook it up and see if it has "read history data" in 19 module or give me a pic what options you have
     

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