Instrument Cluster Icons Overview Instrument Cluster Icons Aftertreatment icons are displayed on the instrument cluster. There are 3 aftertreatment icons: Aftertreatment DPF Regeneration Required High Exhaust System Temperature (HEST) Aftertreatment DEF Tank Low Level Indicator The Aftertreatment DPF Regeneration Required icon flashes when the Diesel Particulate Filter (DPF) is full/overfull and re- generation is needed. W3007445 Aftertreatment DPF Regeneration Required Icon The HEST icon illuminates when a parked Aftertreatment DPF Regeneration Required is initiated. It also indicates high ex- haust gas temperature during a passive regeneration.
When the HEST icon is illuminated, do not park or operate the vehicle near people, or any flammable materials, vapors, or structures. W3007444 HEST Icon The aftertreatment DEF tank low level indicator icon illuminates when the fluid level is low. It also flashes when the level be- comes critically low. W2029416 Aftertreatment DEF Tank Low Level Indicator Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU USA141023213 Date 2.2018 Body Builder; Engine, MP7, MP8, and MP10 Page 29 (40) All Rights Reserved