what does it mean

 

P2509 = ECM/PCM Power Input Signal Intermittent

There is no 02509. Are you sure you read it right?

 

For 04.5 the P2509 = "Power Down Data Lost Error" The ecm saw a drop in B+ voltage over a predetermined period of time. Possible causes: bad battery, open + to ECM, open ground, B+ short to other circuits, return circuit short, INTERMITTENT. I've seen this on one other truck and was not able to duplicate or diag any prob. Cleared the code and haven't seen the truck back. No TSBs apply.

 

tnx dad did pull the cables to try to reset the ecm