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Thanks for asking your question. I will try and help you out.
Code 18 is defined as injection actuation pressure output fault. This is the two wire circuit that runs from the ECM to the heui pump. Since you have replaced the heui pump. The problem is either in the harness or the ECM is faulty. I would replace the two wire harness. Cat sells a two wire bypass harness. You do not have to replace the entire harness. If the harness is not the problem. It must be the ECM.
Code 39 is defined as an injection actuation pressure problem. This can be caused by the code 18, a bad heui pump, faulty IAP sensor, or a leaking injector.
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