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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P2509-Pcm/Pcm Power Input Signal Intermittent >> Code Description >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
POOR CONNECTIONS AT THE BATTERIES
BATTERIES DISCONNECTED WITHIN TEN MINUTES AFTER KEY OFF
LOW BATTERY VOLTAGE
OPEN FUSED B+ TO PCM
OPEN GROUND CIRCUIT
BATTERY POSITIVE SHORTED TO OTHER CIRCUITS
RETURN CIRCUIT SHORTED
BATTERY POSITIVE SHORTED TO GROUND
DEFECTIVE BATTERY

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L  .