Does anybody know of common ecm issues with the 6.4 dpf circuit?

My 08 F350 is having very frequent regens and p2453 code and reduced power mode. DPF pressure sensor is showing 1.1 psi key-on, engine-off on scan tool.

Following Ford's pinpoint procedures, I have concluded that the ecm-b pin 10 (dpf) has 4 volts (should be 0 volts). I have verified that it is not a wiring or ground issue and by process of elimination, it must be an internal ecm fault. I put in another used ecm and it has the same problem.

Since 2 ecm's are having the same issue, I wonder if it is a common ecm failure, or I am missing something in the diagnostics? Does anybody know anything about this?

 

what are using for a scan tool?

It could be one of the sensors for the dpf.

 

I have Ford IDS and VCM. I also have an OTC Genisys. I did get it figured out.

It seems that Ford's pinpoint diagnostic is incorrect. Pinpoint RB13 states to check dpf pressure sensor pin 3 for voltage to ground, and if any voltage present, then "repair the short circuit". This misled me. Since I was getting voltage with 2 ecm's, I suspected bad ecm's. Well, I decided to check the same circuit on another perfectly running truck and it had the same voltage present. So the hours I spent trying to figure out what was wrong with the circuit turned out to be the service manual was wrong.

It turns out that the large white connector on the driver's side (connector C110) was the fault. This connector gets disconnected when the cab comes off. The connector's locking lever doesn't seem to work very well. I found it was not latching well. I had to lock it down with tie-wraps to hold the latch in place so the connector stays tight. This fixed the problem and operation of the dpf is back to normal. The connector was making a marginal connection which erroneously gave a high dpf pressure to the computer. This caused the very frequent regens. On the bright side, my dpf is extremely clean now.