Exhaust Trap Inlet Pressure error by onboard diagnostics

[RockerC]

Recently I had the DPF cleaned by a dealer. Fixed the STOP ENGINE light that was coming on and staying on. After driving approximately three hundred miles had a check engine light come on and stay on. Ran the onboard diagnostics and it returned exhaust trap inlet pressure. Whether it’s high pressure or low pressure I don’t know. My truck is a 2014 Peterbilt 386 w/Cummins ISX 15 rated at 450 HP. Any ideas what’s going on with my ride?