2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

dtc code p0340 help please

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Old Sep 6, 2007 | 07:21 PM
  #11  
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myredgt
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From: Nashville, TN
Default RE: dtc code p0340 help please

Well, I put it back to stock and drove for a minute with the a/c on. It went fine for about 10 minutes, then the light kicked on. I'm gonna take it in to the dealer next week and let them fix it, warranty and all. Thanks again, I can't wait til it's over.[&:]
Old Sep 13, 2007 | 03:45 PM
  #12  
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myredgt
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Default RE: dtc code p0340 help please

***update***


I took it to the dealer and they said it was the alternator after all. They replaced it, free under warranty, and have not had a problem since then.

Oh well, worked for me I guess. Thanks for the help everyone!

- C
Old Sep 13, 2007 | 03:58 PM
  #13  
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Default RE: dtc code p0340 help please

it could be the AC blower motor was pulling just enough to mess the alt
Old Sep 13, 2007 | 03:58 PM
  #14  
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bl1nk
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From: Florida
Default RE: dtc code p0340 help please

Did you have it tuned when you took it to the dealer and had them replace it or did you return it to stock?
Old Sep 13, 2007 | 04:33 PM
  #15  
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myredgt
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Default RE: dtc code p0340 help please

I returned it stock so I wouldn't take any crap over it. I put the tune back in as soon as I got her back and it has ran fine since then. That was yesterday. I know it's fine because the maximum it would go with the tune before the light came on after a dtc reset was aboout 30 sec before I took it in. It's been over a day now so I'm not worried.

- C
Old Sep 13, 2007 | 04:38 PM
  #16  
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bl1nk
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Default RE: dtc code p0340 help please

Cool, thanks. Now I just have to get mine to pop back up without my tune in.[&:]
Old Sep 13, 2007 | 04:46 PM
  #17  
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myredgt
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From: Nashville, TN
Default RE: dtc code p0340 help please

Mine took about 10 min after returning it to stock. Just turn on your a/c and drive. I know, it's so annoying going back to stock. Lag and blahhhh. It will come on, then take it in. If they ask why it appears it was reflashed, just say you did the old unplug the battery test, and it obviously didn't reset the dtc.

- C
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