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Service bulletin K55905221

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10142709
Published by NHTSA2018-07-16
Manufacturer's numberK55905221
Manufacturer's date2018-06-15
NHTSA componentFUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL

NHTSA's summary

Mack Chassis - Diagnostic Trouble Code ( DTC ) P0420 Illuminating The Malfunction Indicator Lamp (MIL) - US17+OBD16 And US17+OBD18 (GHG17) Emissions (Common Rail Fuel System) - Commonly Model Years 2018 And 2019

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Fuel system, Fuel injection

Trouble codes named

P0420

Vehicles listed
MACK ANTHEM (AN)2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
MACK CHU2018
MACK CXU2018
MACK GRANITE (GU)2019 (the catalog's model; the bulletin names a series or trim of it)
MACK GU2018
MACK LR2018, 2019
MACK MRU2018
MACK PINNACLE (CHU)2019 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (CXU)2019 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
K769925572018-10-15. Service bulletin. Aftertreatment Hydrocarbon Injector (AHI, 7th Injector) Changes Between US10 And US17 (GHG17, Common Rail Fuel System) - Chassis Experiencing High soot Accumulation, Abnormal ( Too High, Overtemp, Too Low ) Regeneration Temperatures Following An Aftertreatment Hydrocarbon Injector Nozzle Replacement Procedure
K042471742018-08-20. Service bulletin. Diagnostic Trouble Code ( DTC ) P471 Illuminating The Malfunction Indicator Lamp (MIL) - US17+OBD16, US17+OBD18 (GHG17, Common Rail Fuel System) Chassis With Turbo Compound ONLY
K736582942018-07-16. Service bulletin. Mack Chassis - Diagnostic Trouble Codes ( DTC's ) P24A0 And P249F Lighting The Malfunction Indicator Lamp ( MIL ) - US14+OBD15, US14+OBD16 (Common Model Years 2016 And 2017), US17+OBD16 And Newer ( Common Rail Fuel System, Model Year 2018)
K005275122018-07-16. Service bulletin. Mack Chassis - Vehicles Equipped With A Vertical Selective Catalytic Reduction (SCR) System - Diagnostic Trouble Codes ( DTC ) P1031 With Possible P24DA Lighting The Malfunction Indicator Lamp ( MIL ) - US17+OBD16 (GHG17, Common Rail Fuel System) Emissions, Commonly Model Year 2018
K232320432018-07-16. Service bulletin. Mack Chassis - Diagnostic Trouble Code ( DTC ) P02FA Illuminating The Malfunction Indicator Lamp (MIL) - US17+OBD16 And US17+OBD18 (GHG17) Emissions (With Common Rail Fuel System), Commonly Model Years 2018 And 2019
K536232402018-07-16. Service bulletin. Diagnostic Trouble Code ( DTC ) P0471 Illuminating The Malfunction Indicator Lamp
K422001142018-05-29. Service bulletin. Mack Chassis - Diagnostic Trouble Code ( DTC ) P009E-73 - Fuel Pressure Relief Control Performance / Stuck Off - US17+OBD16 And US17+OBD18 ( GHG17 ) Emissions (With Common Rail Fuel System), Commonly Model Years 2018 And 2019
K146374122018-03-12. Service bulletin. Diagnostic Trouble Code ( DTC ) P0194 - 00 - Fuel Rail Pressure Sensor ( RPS ), Circuit Erratic, Intermittent - US17 ( GHG17 ) Emissions And Newer ( Common Rail Fuel System ); Common Model Years 2017 And 2018.Changed repair instructions to reflect new procedures