All 4 camshaft sensor codes p0340 p0349 p0369 p0394

Discussion in '2011+ Mustang GT 5.0L Tech' started by Adam Lee, Oct 12, 2021.

  1. Adam Lee

    Adam Lee Junior Member

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    I have a 2012 Mustang GT with a procharger on it. The tune is from Lund racing. The car has 29000 miles on it. I'm having a problem with these four codes popping up and I'm not as powerful with the engine light on. Stock cams. If I am getting off work hard at the same time now, doesn't that mean something major is wrong?

    Screenshot_20211011-190955_ScanMaster.jpg
     
  2. Juice

    Juice forum member

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    Since those are intermittent AND on all 4 cams, I suspect an electrical issue common to those sensors.
     
  3. Adam Lee

    Adam Lee Junior Member

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    Where do i start? Lol i cant see behind the engine.
     
  4. Juice

    Juice forum member

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    Well, with any electrical system issue, its never a bad idea to check charging system/battery first. Unstable or low system voltage will cause wierd issues.
     
  5. Adam Lee

    Adam Lee Junior Member

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    Ok i went out with volt meter. Battery is a duralast gold made on 12/2019. It has 12.5v before start up. That was normal i thought. When i started it i had 14.6v so alternator is working. I did notice when i was cranking it over to start the engine that the voltage went down as far as 10.5v on the battery. Should a battery dip that low when cranking the engine? I checked all 4 cam sensor pigtails and wiring , nothing looks burnt, melted, or chewed. Im at a loss
     
    Last edited: Oct 12, 2021
  6. Juice

    Juice forum member

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    Voltage is good.
    Time to break out the shop manual and follow the checklist to troubleshoot those codes.
     
  7. bigbug11

    bigbug11 Junior Member

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    Replace your original factory alternator. All your dead battery problems and cam codes will disappear.
     
  8. Adam Lee

    Adam Lee Junior Member

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    Even if the alternator reads 14.5v?
     
  9. Juice

    Juice forum member

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    Check for AC ripple first.
     
  10. Adam Lee

    Adam Lee Junior Member

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    Ok how? Find it on google? AC mean alternator current?
     
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