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

need more info to help you year and engine sice

that code showes up a lot of the time if one of the batters need to be replaced. i would have a battery tester put on them both

I do not have Cummins codes so I would consider replacing the injectors or taking it to a Cummins service centre to have it fixed as the parts will not be cheap if not diagnosed correctly

The PO628 means your lift pump has went bad. You can try hitting on it lightly and see if it will start back up. Many replace with an holly or equivalent aftermarket pump which is much better then the original. You can find info on the web to do this. http://www.dieselperformance.com/index.php/product/index/175P. The P2509 code sounds like one of your batteries is going bad. Have them checked out and see if they are fully charged and holding a charge. Also check to make sure the terminals are clean and cables are tight.

Could just be a dead battery

This is not a repair shop or free tech support site,
just a social web site like facebook

Your battery may have a bad connection.
http://dodgeforum.com/forum/dodge-cummins-diesel/141147-fault-code-p2609-and-p2509.html

Check that ths DTC P2509 ECM/PCM Power Input Signal Intermittent

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:
- Connector C2 (polarizing pins are at the bottom of the connector): 20, 30, and 40. Those need to be +12. Pins 21, 49, and 50 are the grounds.
- Run the voltmeter into the cab so you can watch it all the time.

Hope helps (remember rated this).

your code is PCM/ECM power input signal intermittent. this is ussually a sign of a bad connection whether it be in a connector or a short or brake in a wire.

p0303=misfire on cyl 3
p0513=incorrect immobilizer key
p2503=charging system voltage low
p063d=charging system voltage high
p2509=PCM input signal intermittent
have a dealer check this one,it could be anything from the ignition to a alternator failing

Please check your ground wire they have a weak link there and have frequent problems on the ground curcit