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  1. #1
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    O2 low voltage heater codes all four - 06 Magnum

    I did the headlight test for voltage and got

    No light when hooked up to heater pos and neg
    No light when hooked up to heater pos and remote ground
    Lights up with pos to remote 12v, neg to heater neg

    I checked the voltage coming from the PCM and got (3.64) volts

    I checked the grounds and had (0.00) ohms resistance

    Is it time for a new PCM?

  2. #2
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    Headlight test?

    Doesn't sound like the Diagnostic Test outlined in the Factory Service Manual...
    2005 Magnum RT---Viper Venom Red----440ci Aluminum block----Short Runner Valve Intake--410mm BAER 6S Monoblock Extreme--Eibach Multi-Pro 2

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  3. #3
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    Yeah, no, I was referenced to this site from Craigslist forum for some better answers but I saw it referenced a few times on Youtube also that you use a headlight bulb to check for heater voltage because they they both draw similar currents and if there is no load on it, the ECM is expecting a load and isn't receiving one, so it reduces the voltage to the heater.

    So using this method I got the readings listed. It seems that the voltage is constant at 3.64v, which doesn't light the light or heat the heater. I originally thought there was a common ground or something that was causing all four to be bad but, I was getting 0.0 resistance on three of the grounds.

  4. #4
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    Follow the Diagnostic Process outlined in the Factory Service Manuals we all have the luxury of downloading for free.

  5. #5
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    Quote Originally Posted by jawin_jonn View Post
    I did the headlight test for voltage and got

    No light when hooked up to heater pos and neg
    No light when hooked up to heater pos and remote ground
    Lights up with pos to remote 12v, neg to heater neg

    I checked the voltage coming from the PCM and got (3.64) volts

    I checked the grounds and had (0.00) ohms resistance

    Is it time for a new PCM?
    It is definitely time for a new pcm . The older ngc3/4 controllers were notorious for that problem, the 02 sensor heaters were a high side driver output coming out of the pcm. Most of the time when they fail they set codes for all 4 heaters at once, some rare occasions they will set only one or 2 .
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  6. #6
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    Did you get o2 heater codes on all four. Two upstream have common ground. Two rear have common ground. As stated above Hi side driver for o2 heaters. I always check ground with high amp test light. An ohm meter wont check for load check.

  7. #7
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    Quote Originally Posted by circ1977 View Post
    It is definitely time for a new pcm . The older ngc3/4 controllers were notorious for that problem, the 02 sensor heaters were a high side driver output coming out of the pcm. Most of the time when they fail they set codes for all 4 heaters at once, some rare occasions they will set only one or 2 .
    So all four codes went on my 06 magnum plus a p1129 &1128 , I've replaced the sensors and the map to no avail. I'm starting to think my pcm is a possible culprit. Any thoughts ?


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  8. #8
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    Quote Originally Posted by ronan978 View Post
    So all four codes went on my 06 magnum plus a p1129 &1128 , I've replaced the sensors and the map to no avail. I'm starting to think my pcm is a possible culprit. Any thoughts ?


    Sent from my SM-G988U using Tapatalk
    By chance did you drop a 180 in there?

    Sent from my moto z4 using Tapatalk

  9. #9
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    Quote Originally Posted by punisher69 View Post
    By chance did you drop a 180 in there?

    Sent from my moto z4 using Tapatalk
    No sir , the only work I've done so far is body/chassis and suspension. And now the 02's and the map. I'm saving the fun stuff for when I get her running tip top.



    Sent from my SM-G988U using Tapatalk

  10. #10
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    I sent my PCM into ZKboys, after seeing them on Youtube. They went through, checked it out and fixed the O2 heaters grounds. I had other issues come up after reinstalling it but, it had nothing to do with what they fixed.

  11. #11
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    Quote Originally Posted by jawin_jonn View Post
    I sent my PCM into ZKboys, after seeing them on Youtube. They went through, checked it out and fixed the O2 heaters grounds. I had other issues come up after reinstalling it but, it had nothing to do with what they fixed.
    What did they charge you ?

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  12. #12
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    $90

    Quote Originally Posted by ronan978 View Post
    What did they charge you ?

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    It cost me $90 and I saw them on Ebay. You send yours in and they fix it, if they can.

    I think if they test it and it can't be fixed, they charge you half price for the testing.

    They say fast turnaround but, they might need a reminder

    SIA Electronics is a leader in the automotive electronics re-manufacturing field. With over 20 years in this business we have the knowledge and equipment to rebuild any automotive electronic part. ECU, ECM, PCM specialists.


    If your SKIM (security key immobilizer module) ever shuts your car down look up these people, they will send you a new PCM with the SKIM disconnected, so it will start with just a steel key

    Good Luck!


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  13. #13
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    Quote Originally Posted by ronan978 View Post
    So all four codes went on my 06 magnum plus a p1129 &1128 , I've replaced the sensors and the map to no avail. I'm starting to think my pcm is a possible culprit. Any thoughts ?


    Sent from my SM-G988U using Tapatalk
    yup, send in your pcm or get a replacement



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