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Old 08-19-2013, 01:20 PM
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tjbiker031 tjbiker031 is offline
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Join Date: Dec 2011
Location: Bradenton, FL
Age: 30
Posts: 307
Gender: Male
Vehicle: 2002 Dodge Ram
Trim Level: SLT - Quad Cab
Color: Graphite Metalic
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 4
Rep:118
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hopefully this will help....

P2509-ECM/PCM POWER INPUT SIGNAL INTERMITTENT

The ECM receives a constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle Ignition Switch wire when the vehicle is turned on. The ECM will illuminate the MIL lamp immediately after the diagnostic runs and fails. During the time the customer may experience some performance effects such as engine dying or hard starting. Fault information, trip information could be inaccurate. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.

When Monitored:
Continuous - key on or key off.

Set Condition:
Loss of voltage detected at the ECM for a calibrated amount of time. Supply voltage to the PCM fell below 6.2 volts momentarily or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after key off).


possible causes.....

POOR CONNECTIONS AT THE BATTERIES
LOW BATTERY VOLTAGE
OPEN FUSED B+ TO ECM
OPEN GROUND CIRCUIT
BATTERY + SHORTED TO OTHER CIRCUITS
RETURN CIRCUIT SHORTED
BATTERY + SHORTED TO GROUND
DEFECTIVE BATTERY

I have seen this code set if you try to start the truck with only one battery hooked up
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