We replaced a blown fuse and thought that was the issue, Will drive for 2-3 hrs after clearing light, then comes back on. Does not derate the engine, when the light comes on, jake brakes are little to none on high. Will not slow it down even being empty. Still regens and uses DEF, Trying to see if anyone has run across this. 2019 Peterbilt 389 with x15 performance
Emission Derate with wrench
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by boblynn, Feb 3, 2024.
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