Volvo/Mack Breakout Harness. Rule out a bad engine harness. Standard J1939 adapters will work eg. Nexiq USB-Link 2.
BOD Engineering Paccar MX13 Breakout Harness
BOD Engineering Detroit EPA10 Heavy Duty Breakout Harness
BOD Engineering Volvo/Mack Breakout Diagnostic Harness
BOD Engineering Detroit EPA07 Heavy Duty Breakout Harness
BOD Engineering Caterpillar 40-Pin Industrial Heavy Duty Breakout Harness