Mack CXU aftertreatment not dosing derate 5mph

2015 Mack CXU derating for aftertreatment issues, not dosing code 5394- Diesel Fluid Dosing Valve 1 current below normal or open

[@dchawk81]

PTT is pretty expensive the first year but has diagnostic procedures for the doser, 7th injector, and the AHI module.
Annual renewal is so cheap its a no brainer to keep around. And I only have one truck.