Question about 2007 Dodge Ram 2500 Mega Cab Laramie

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P2509 what are some possible solutions - 2007 Dodge Ram 2500 Mega Cab Laramie

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Check the battery cables making sure they are clean and tight. Have the batteries checked. Change both batteries at the same time if you don't the older one will pull down the new one and make it go bad quicker.

My batteries were low on water so the voltage was low and it keep throwing p2509. Added water and Its gone now.

Posted on Nov 14, 2014

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Probably a bad connection to the engine computer. It's got two power feeds, switched/key and constant. The motor won't run without the switched key power on. Long story short, the computer can detect if the power leads aren't solid. Check the battery terminals, all the fuses, all the relays, and the PCM connector itself (if it's easily accessable).

Posted on Aug 25, 2010

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Probably a bad connection to the engine computer. It's got two power feeds, switched/key and constant. The motor won't run without the switched key power on. Long story short, the computer can detect if the power leads aren't solid. That code should give the dealer something to look for. Before bringing it in check the battery terminals, all the fuses, all the relays, and the PCM connector itself (if it's easily accessable).

Also, according to the powertrain diagnostics manual, page 248, it's "Powerdown data lost error". Set condition: loss of voltage detected at the ECM for a calibrated amount of time.

If you don't trust your dealer to perform the diagnostics, I recommend splicing a volt meter into the following power pins on the ECM:
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- Run the voltmeter into the cab so you can watch it all the time.

Hope helps (remember rated this).

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