Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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My chart shows for that code:
P2552 FICMM Circuit - Throttle/Fuel Inhibit Circuit
No signal from the FICM Monitor circuit
Circuit open/short, FICM, PCM
I think you have already figured out the problem. Either you bent a pin or did not seat the connectors fully. It can be a bear to get them on 100%.
Worth a shot to take it off and inspect the pins really close, including on the wire side. Another possibility is by moving the wires around you may have found a wire chafe that is now grounding out. Take a real close look at the FICM wiring where the valve cover bolts are.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter