2014 Mack Gu

Owner complaints

Latest complaints

• Feb 16, 2021FLCrash1 injury
  Power train

  The drive shaft of this truck fell off on northbound I-95 while it was driving.*dt*jb

Service bulletins

Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.

• 10253804CBR: Equipped With An Automated Manual Transmission Model D or F ( AMT-D, AMT-F, mDrive) Missing X1 Value In VDA And Default Settings Guidelines, ParameterP1AOB; Fault Code P1052-54, Error 40,Or Error 18 Encountered During Clutch Or Tran.
• 10251333CBR -Telematics Gateway (TGW) Connect Ability Issues
• 10251331CBR - Active "Set Park Brake" Message On Drivers Information Display (DID).
• 10251329CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft.
• 10251328CBR - Driveline Noise, Suspension Ride Height Too High, Suspension Will Not Exhaust - Chassis Built 2016w01 And Newer.
• 10249553CBR: TGW Will Not Connect After SIM Card Replacement
• 10248108Emissions Campaign: Mack Trucks has determined that certain 2014 - 2018 commercial model year CXU, GU, LEU, LR, MRU Vehicles require a replacement Diesel Particulate Filter (DPF) along with updated software.
• 10248101CBR: For vehicles equipped with an 11L engine, the plastic saddle bracket holding the a/c line on the left side of the engine may move excessively and rub the area where it secures the line.
• 10246086TSB: Mack Trucks now offer an improved HD Inter-Axle Through Shaft for the CRD 125, 150, 180, and 200 family carriers. The new HD shaft went into production on January 23rd, 2023 for 2.54 - 3.50 axle ratios and April 1st, 2023 for 3.56 - 3.98 ratios. The new HD through shaft is an upgrade over the current standard shaft and can now be used as a replacement part instead of the standard shaft. The new HD shaft has a new design to increase strength, longevity and life over the standard shaft.
• 10244819CBR: Telematics Gateway ( TGW, MID 142 ) Losing Communication With The Instrument Cluster ( IC ) - Counts Of Fault Code (FC) MID 140 PSID 239 FMI 12 Data Link, MID 142 Faulty Device or Component Logging, Possibly Following Engine Start.
• 10243453TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
• 10241946TSB: Barksdale Leveling Valve, Leak Test
• 10241945TSB: Air Restriction Indicator
• 10240231CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission
• 10240202CBR: Mack DEF Dosing Valve Diagnostic Trouble Codes (DTC) P202D00, P208E00, P103B00 - US10+OBD13 And Newer Emissions
• 10237374Service Literature Published and Released in May, 2023
• 10237351CBR: Automated Manual Transmission ( AMT ) -Transmission Electronic Control Unit ( TECU ) MID130 PSID 29 FMI 7 /P10AE81 Fault Codes Being Generated
• 10237348CBR: Automated Manual Transmission (AMT) Transmission Kickdown Mode
• 10237342CBR: Diagnostic Trouble Code (DTC) P215A-64, Fault Code SPN 84 FMI 19
• 10235490TSB: Vibration Diagnostics
• 10235489TSB: Stock Vehicle Storage and Maintenance
• 10232599Flywheel Housing Thread Repair
• 102286302007 document reformatted to be published as a TSB in Impact. Lateral cab movement bracket.
• 102226442008 Document reformatted to be published as a TSB in Impact. Air suspension ride height.
• 102226412008 Document reformatted to be published as a TSB in Impact. Two-Piece clutch brake.
• 102226402008 Document reformatted to be published as a TSB in Impact. Grille bar, replacment.
• 102226302008 Document reformatted to be published as a TSB in Impact. HVAC fine particulate filter.
• 102226212008 Document reformatted to be published as a TSB in Impact. Loose oil filter spud.
• 102226202008 Document reformatted to be published as a TSB in Impact. Cooling system connections.
• 102226152008 Document reformatted to be published as a TSB in Impact. Paint protection.
• 102226142008 Document reformated to be published as a TSB in Impact. Torque rod interference.
• 102226132008 Document reformated to be published as a TSB in Impact. Field repair for installing the grill.
• 102226102008 Document reformated to be published as a TSB in Impact. Revised battery ti battery cable
• 10222608TSB-Charge Air Cooler t-clamp install.
• 102191352009 Document reformatted to be published as a TSB in Impact. Turbo Actuator Connector Repair.
• 102190822009 Document reformatted to be published as a TSB in Impact. Axle Carrier Pinion Angles
• 102153562008 document reformatted to be published as a TSB in Impact. Fan Ring clearance for GU Model Truck.
• 10215315Programming Failure - Chassis With Cummins Engine And An Allison Transmission
• 10215314NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions.
• 10215312(Back Office) - Cruise Control Inoperative After Updating Software VECU5 Without ESP Package (UESP).

Every Mack Gu model year

Bars are owner complaints, dots mark years with recalls. Select a year to open its report.