Question about 2004 Dodge Ram 2500
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).
Posted on Jul 19, 2010
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Posted on Jan 02, 2017
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