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Fault code P3140

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My hybrid  Alphie has developed another fault.  It will only intermittently start and after using techstream has a fault code of P3140.  Has anyone had this code and managed to find what the issue was.  Help would be much appreciated.





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Googling that fault code shows that on the Prius it is associated with the service plug on the battery or an interlock switch on the HV inverter cover. 


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