P009B on the 2019 Mack Terrapro
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| KC-2109 | 2021-04-05. Service bulletin. Mack Chassis - Diagnostic Trouble Code (DTC) P009B-13 Fuel Pressure Relief Control – Circuit Open; Possible Derate - US17+OBD16 And US17+OBD18 Emissions, Model Years 2018 And 2019 |
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| K94743326 | 2019-05-20. Service bulletin. Diagnostic Trouble Code (DTC) P009B-13 Fuel Pressure Relief Control - Circuit Open; Possible Derate - US17+OBD16 And US17+OBD18 Emissions, Model Years 2018 And 2019 |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.