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david, Auto Service Technician
Category: Dodge
Satisfied Customers: 1500
Experience:  Certified Master Technician,Certified in diesel & gasoline engines
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06 dodge cummins code p2509 (ecm)supply voltage intermittent

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06 dodge cummins code p2509 (ecm)supply voltage intermittent can tell what it means
Hi thank you for your question hope this helps.

P2509 Vary common problem
code is set when one or both batteries are weak or dead. this would be the first place I would look or loose cable connections check all battery cables.

If you find the batteries are in good shape check for a bad ground at the intake heater or a loose connection to the ECM.

Hope this helps
Good luck
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