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I just had my injectors replaced and have p0278. I had them changed cause that same code kept coming up. I changed the injector harness and no change. Ficm volts stays 49-49.5 v I unplugged the icp and now the code has not come back. I don’t want to keep driving with icp unplugged. If icp is plugged In no code until truck is fully warmed up. Also have installed new icp. I was just hopping maybe someone has seen this before.

icp plugged in
201887


icp unplugged

201888
 

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Also, with icp unplugged, the computer will use reference pressure which is why the 800psi, compared to the 600 psi. Your code is contribution for #6 injector. Check the plug and wiring on that injector, along with the bubble test of course.
 
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