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The silicone tubes running to the DPFE are known to deteriorate over time. The small leakage will affect the way the DPFE measures the difference in pressure. The EGR tube is also known to crack and leak or clog up with deposits.Both of which can also trigger EGR related codes.
Found it. Thank you all so much. Also I found another thread that explained how to test it and I tested and I am not getting any change in voltage with vacuum. It is stuck at 0.28 volts. So I am going to replace it and see if the P0401 code goes away.
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