WenmarOpen by Wenmar Pro

Service bulletin K91121166

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 id10145537
Published by NHTSA2018-10-15
Manufacturer's numberK91121166
Manufacturer's date2018-09-25
NHTSA componentENGINE; POWER TRAIN:MANUAL TRANSMISSION

NHTSA's summary

Mack Chassis - Automated Manual Transmission Model F (AMT-F, mDrive) - Possible Infrequent Hiccup/Stumble During Steady Engine/Vehicle Speed; Diagnostic Trouble Code P1074-92 Logging, Appears As Inactive - Common 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

Engine, Transmission and driveline, Manual transmission

Trouble codes named

P1074

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 (GR)2019 (the catalog's model; the bulletin names a series or trim of it)
MACK GRANITE (GU)2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
MACK GU2018
MACK PINNACLE (CHU)2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (CXU)2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (PI/PN)2018, 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
K210752532018-10-15. Service bulletin. Mack Chassis - Automated Manual Transmission Model F ( AMT-F, mDrive ) - Short Transmission Replacement; Calibration And/Or Shifting Problems Following Replacement Of A Short Transmission - US17+OBD2016 And Newer Emissions, Model Year 2018 And Newer
K615106582018-07-16. Service bulletin. Mack Chassis - Equipped With An Automated Manual Transmission Model F (AMT-F, mDrive) With Crawler Gears - Setting The Maximum Gear That Can Be (Temporarily) Selected For Starting From Stop In Automatic And Manual Modes; New Parameters For Maximum Adjustable Gear In Automatic And Manual Modes; US17+OBD16 And Newer Emissions, Commonly Model Year 2018 And Newer
K313781532018-07-16. Service bulletin. Mack Chassis - Vehicles Equipped With An Automated Manual Transmission Model F ( AMT-F, mDrive ), Premium Tech Tool ( PTT ) Gearbox Calibration Failure; Gearbox Calibration Operation Stops And Fails At 33% - US17+OBD16 (GHG17) And Newer Emissions, Common Model Years 2018 And Newer
K486615442018-03-12. Service bulletin. Chassis Equipped With An AMT-F (mDrive) - Idle Drive Function Activates When Vehicle Is Reversing/Backing Up At Low Speed; Information And Repair - Build Date Beginning Of Production 2017 To February 2018