Problems owners report
Complaints filed with NHTSA about the 2009 Mack GU, by the system named in each complaint. One complaint can name several.
- Engine1
NHTSA ODI complaints (public domain) · updated 23 Oct 2026 · 0 injuries and 0 deaths reported
Compared with other years
NHTSA ODI complaints by model year
Recalls in Canada
5 Transport Canada recalls for the 2009 Mack GU.
| 2015372 17 Aug 2015 | Brakes On certain vehicles, The chassis electrical harness and air brake lines may not have been properly secured at the crossmember. This could cause the electrical c… |
| 2014527 20 Nov 2014 | Electrical On certain model vehicles, water around the windshield can migrate into the Electronic Power Distribution Module and contaminate it. As a result, circuits may … |
| 2014146 22 Apr 2014 | Lights And Instruments On certain vehicles, the directional/hazard signal flasher may fail. Actuation of the turn signal or hazard lights in this condition would cause them to remain… |
| 2008277 6 Aug 2008 | Lights And Instruments On certain tucks, the headlamp bulb shield may not be completely seated into the headlamp reflector. This could result in a non-compliance with the Motor vehic… |
| 2008124 14 Apr 2008 | Brakes Certain vehicles may have been assembled with an incorrectly manufactured Bendix MV-3 dash control valve. If the double check valve becomes lodged, in the even… |
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada
Recalls
Mack Trucks Inc. (Mack) is recalling certain model year 2010-2014 CHU, CXU, and MRU, 2007 CT and CV, 2008-2014 GU, and 2011-2014 LEU, and TD trucks manufactured February 28, 2006, through November 8, 2013, and equipped Hamsar Electronic Flasher. The hazard warning lights may fail.
Mack Trucks, Inc. (Mack) notified the agency on February 20, 2014, that they are recalling certain model year 2010-2012 CHU, CXU, GU and TD vehicles manufactured from June 16, 2009, through July 8, 2011. While continuing to research the scope of the issue, Mack expanded the recall on November 18, 2014 to include certain model year 2008-2009 and 2013-2014 CHU, CXU, GU and TD vehicles manufactured from June 16, 2009, through July 8, 2011. Having completed its investigation, Mack once again expanded the recall during February 2015 to include an additional 53,780 vehicles from model years 2007 and 2015. The recall now covers model year 2007-2015 includes CHU, CXU, GU and TD vehicles produced October 13, 2006, through October 3, 2014. In the affected vehicles, the Electronic Power Distribution Module (EPDM) may be contaminated from water leaks in, and around, the windshield. If exposed to water leaks, contaminants such as road salts may deposit on the EPDM.
Mack Trucks is recalling certain model year 2008-2009 GU, LEU, and MRU trucks, manufactured from December 12, 2007, through May 8, 2008 and equipped with a certain focal mounted retarder control box. The control box may lose its electrical ground.
MACK TRUCKS IS RECALLING CERTAIN MODEL YEAR 2008-2011 GU HEAVY TRUCKS MANUFACTURED FROM SEPTEMBER 12, 2007, THROUGH APRIL 8, 2011, WITH A FOUR BATTERY CABLE DESIGN. AS A RESULT OF THE ROUTING AND CLIPPING USED, THE BATTERY CABLES MAY COME INTO CONTACT WITH FRAME HARDWARE, WHICH, AS A RESULT OF CHAFING, MAY CAUSE THE INSULATION TO BECOME WORN TO A POINT WHERE A SHORT OCCURS.
MACK IS RECALLING CERTAIN MODEL YEAR 2008 THROUGH 2011 GU AND MRU MODEL VEHICLES MANUFACTURED WITH A FRONT TOW GLAD HAND OPTION. THE ACTUATION AND RELEASE TIMING OF THE VEHICLES EXCEEDS THE LIMIT WHICH FAILS TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS."
MACK IS RECALLING CERTAIN MY 2009 TRUCKS EQUIPPED WITH HELLA HEADLAMPS FOR FAILING TO COMPLY WITH THE PHOTOMETRIC OUTPUT REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, 'LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THE HEADLAMP'S BULB SHIELD MAY NOT HAVE BEEN COMPLETELY SEATED INTO THE HEADLAMP'S REFLECTOR.
MACK IS RECALLING 66 MY 2009 GU TRUCKS EQUIPPED WITH BENDIX MV-3 DASH CONTROL VALVES. THE MOLDED VALVE BODY HAS AN INCORRECT CORE PIN IN THE INJECTION MOLD CAUSING THE VALVE BODY TO BE OVERSIZED IN THE DOUBLE CHECK VALVE AREA. THIS CONDITION CAN ALLOW THE RUBBER DOUBLE CHECK VALVE TO BECOME LODGED IN THE BODY OPENING UNDER CERTAIN CIRCUMSTANCES.
Whether a recall was fixed on a particular car is known only to the manufacturer: check the VIN at nhtsa.gov/recalls.
NHTSA recalls · summaries in NHTSA's own words
Service bulletins
What Mack told its dealers about the 2009 Mack GU: known faults, fixes and updates.
| Bulletin | Summary |
|---|---|
| 10251331 | CBR - Active "Set Park Brake" Message On Drivers Information Display (DID). |
| 10251329 | CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft. |
| 10248101 | CBR: 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. |
| 10246086 | TSB: 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. |
| 10241946 | TSB: Barksdale Leveling Valve, Leak Test |
| 10241945 | TSB: Air Restriction Indicator |
| 10237342 | CBR: Diagnostic Trouble Code (DTC) P215A-64, Fault Code SPN 84 FMI 19 |
| 10237339 | CBR: eWarranty To UCHP Labor Code ( SCC Code ) Crossover, Conversion Information For Use With Campaigns ( FI, PI ) And Recalls ( EC, SC ), Location On Trucks Dealer Portal ( TDP ) |
| 10235490 | TSB: Vibration Diagnostics |
| 10235489 | TSB: Stock Vehicle Storage and Maintenance |
| 10232599 | Flywheel Housing Thread Repair |
| 10232598 | Instrument Cluster Programming - Programming Fails Or Errors Display When Replacing An Instrument Cluster With A Newer Part Number (Conversion Kit) - US04 To US10 Chassis (9-Pin Diagnostic Connector) |
| 10228630 | 2007 document reformatted to be published as a TSB in Impact. Lateral cab movement bracket. |
| 10222644 | 2008 Document reformatted to be published as a TSB in Impact. Air suspension ride height. |
| 10222641 | 2008 Document reformatted to be published as a TSB in Impact. Two-Piece clutch brake. |
| 10222640 | 2008 Document reformatted to be published as a TSB in Impact. Grille bar, replacment. |
| 10222630 | 2008 Document reformatted to be published as a TSB in Impact. HVAC fine particulate filter. |
| 10222621 | 2008 Document reformatted to be published as a TSB in Impact. Loose oil filter spud. |
| 10222620 | 2008 Document reformatted to be published as a TSB in Impact. Cooling system connections. |
| 10222615 | 2008 Document reformatted to be published as a TSB in Impact. Paint protection. |
| 10222614 | 2008 Document reformated to be published as a TSB in Impact. Torque rod interference. |
| 10222613 | 2008 Document reformated to be published as a TSB in Impact. Field repair for installing the grill. |
| 10222610 | 2008 Document reformated to be published as a TSB in Impact. Revised battery ti battery cable |
| 10222608 | TSB-Charge Air Cooler t-clamp install. |
| 10219135 | 2009 Document reformatted to be published as a TSB in Impact. Turbo Actuator Connector Repair. |
NHTSA manufacturer communications (public domain)
NHTSA investigations
AIR BRAKE CONTROL VALVE
NHTSA Office of Defects Investigation