Help Needed Dtc 1378

[pstockman]

DTC 1378 on 05 F350 6L. FICM replaced in December. Truck started fine this morning. Parked for an hour wouldn't start. Initial code P041 indicated Cam sensor. Disconnected batteries as fault seemed spurious but it was still there. Replaced cam position sensor. Code cleared. No start. Tried a couple of times and got DTC 1378 FICM supply voltage low. I have an Edge after market chip and controller.

Any suggestions as best place to go from here? Check out connections at FICM? Check relay? (Any idea which relay to check?) Disconnect the Edge system? Thanks in advance.

 

[DaveBen]

FICMs go bad at about 120,000 miles, or so. You probably need a new FICM or at least a rebuilt one. I did the new Ford FICM in mine. Sorry, no quick fix after the CPS.

Dave

 

[bismic1]

P1378 is for supply voltage IIRC (Logic Power).

Check out the batteries and alternator.

FYI:
P1378: Low FICM logic power. System detects less than 7 volts. Could be low batteries, loose connections (or excessive circuit resistance), bad relay