I am having fault code 125 on Cummins X15 2020 Kenworth T680 after replacing turbo. The issue is happening when pulling loaded truck uphill. Truck boost drops from 30 psi and goes into derate mode.
I have tested the hoses, intercooler and turbo for any leaks, didn’t find any leaks. I have replaced the intake manifold pressure sensor and the barometric pressure sensor. I am still having the issue.
Please Help.
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