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NHTSA vehicle safety data

2009 Mack GU Recalls & Complaints

The 2009 Mack GU has 7 NHTSA recall campaigns and 1 owner complaint on file as of November 3, 2026. Recall repairs are usually free at an authorized Mack dealer.

NHTSA recall and complaint data for the 2009 Mack GU. Recall data is refreshed daily from NHTSA.

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2009 Mack GU owner complaints

Owners have filed 1 complaint with NHTSA about the 2009 Mack GU, describing incidents dated September 18, 2018.

Most-cited components

  • Engine 1 complaint

Newest complaints

  • ODI #11130249 · Filed

    VEHICLE HAVING ELECTRICAL ISSUES, LIGHTS AND RADIO SHUTTING OFF AND EXHAUST ENGINE BREAK WORKING INTERMITTENTLY. HOOKED UP AND MOSTLY DATA LINK CODES. IC CLUSTER LIGHTS FLASH ON AND OFF WHILE HOOKED UP. FOUND ENGINE ECM FULL OF OIL ON BOTH A AND B CONNECTORS. OIL LEVEL SENSOR IS LEAKING WIC KING OIL…

Read the full complaint

NHTSA defect investigations

NHTSA's investigations file lists the 2009 Mack GU in 1 investigation. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.

Open and recently closed NHTSA defect investigations

Hazard Lights May Not Function

NHTSA #14V208000 · Exterior Lighting — Turn Signal — Flasher Unit · NHTSA notice

Reported April 18, 2014 · Mack Trucks, Inc.

Potentially affected: 44,047 vehicles

Repair completion: 76.63% (latest rate the manufacturer reported to NHTSA; dataset updated November 3, 2026)

Mack campaign SC0379 · Owners notified July 25, 2014 · Vehicles built February 28, 2006 – November 8, 2013 (per NHTSA)

Defect description

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.

Safety consequence

A failure of the hazard warning lights could reduce the trucks visibility, increasing the risk of a crash.

Manufacturer remedy

Mack will notify owners, and dealers will replace the electronic flasher unit, free of charge. The recall will begin by mid-June 2014. Interim letters went out to owners on June 23, 2014. The recall began on July 25, 2014. Owners may contact Mack customer service at 1-866-298-6586. Mack's number for this recall is SC0379.

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Water Leaks may Cause EPDM to Short-Circuit

NHTSA #14V078000 · Electrical System · NHTSA notice

Reported February 21, 2014 · Mack Trucks, Inc.

Potentially affected: 70,208 vehicles

Repair completion: 53.91% (latest rate the manufacturer reported to NHTSA; dataset updated November 3, 2026)

Mack campaign SC0375 · Owners notified April 24, 2014

Defect description

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.

Safety consequence

Deposits of contaminants may result in the circuits being bridged, creating a high resistance short, increasing the risk of a fire.

Manufacturer remedy

Mack has notified owners, and dealers will inspect the EPDM. If contamination has occurred, dealers will replace the EPDM and address the leak, free of charge. Owners of model year 2010-2012 CHU, CXU, GU and TD vehicles were initially notified April 24, 2014. Owners affected by the recall expansions were notified in February 2015. Owners may contact Mack Trucks at 1-336-393-2000. Mack's number for this recall is SC0375.

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Control Box Overheating

NHTSA #12V519000 · Electrical System · NHTSA notice

Reported October 18, 2012 · MACK TRUCKS, INC

Potentially affected: 260 vehicles

Mack campaign SC0366 · Vehicles built December 12, 2007 – May 8, 2008 (per NHTSA)

Defect description

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.

Safety consequence

If the control box loses ground, it may have localized overheating. This could lead to a vehicle fire.

Manufacturer remedy

All affected vehicles were sold to one customer that has already been notified. An official owner notification letter will be mailed to the one customer in early November 2012. Mack will replace the suspect control box on the affected vehicles, free of charge. Owners may contact Mack Trucks at 1-800-866-1177.

Notes

Mack's recall number is SC0366.Customers may contact the National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to http://www.safercar.gov.

BATTERY CABLES

NHTSA #11V292000 · Electrical System — 12V/24V/48V Battery — Cables · NHTSA notice

Reported May 20, 2011 · MACK TRUCKS, INC

Potentially affected: 771 vehicles

Mack campaign SC0354 · Owners notified July 11, 2011 · Vehicles built September 12, 2007 – April 8, 2011 (per NHTSA)

Defect description

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.

Safety consequence

A SHORT CAN POTENTIALLY CAUSE A VEHICLE FIRE.

Manufacturer remedy

DEALERS WILL RE-ROUTE THE BATTERY CABLES AND REPLACE THE CABLES IF CHAFING HAS OCCURRED. THIS SERVICE WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON JULY 11, 2011. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-866-1177.

Notes

MACK'S SAFETY RECALL NO. SC0354.OWNERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO <A HREF=HTTP://WWW.SAFERCAR.GOV>HTTP://WWW.SAFERCAR.GOV</A> .

BRAKE TIMING

NHTSA #10V404000 · Service Brakes, Air · NHTSA notice

Reported September 7, 2010 · MACK TRUCKS, INC

Potentially affected: 369 vehicles

Mack campaign SC0345 · Owners notified February 1, 2011 · Vehicles built October 22, 2007 – June 30, 2010 (per NHTSA)

Defect description

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."

Safety consequence

IF THE BRAKES DO NOT PERFORM AS THEY SHOULD, A VEHICLE CRASH COULD OCCUR.

Manufacturer remedy

MACK WILL NOTIFY OWNERS AND REPAIR THE VEHICLE FREE OF CHARGE. THE SAFETY RECALL BEGAN ON FEBRUARY 1, 2011. OWNERS MAY CONTACT MACK AT 1-877-800-4945.

Notes

MACK'S RECALL CAMPAIGN NUMBER IS SC0345.OWNERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO <A HREF=HTTP://WWW.SAFERCAR.GOV>HTTP://WWW.SAFERCAR.GOV</A> .

HEADLAMPS/HELLA LIGHTING/FMVSS 108

NHTSA #08V331000 · Exterior Lighting — Headlights · NHTSA notice

Reported July 23, 2008 · MACK TRUCKS, INC

Potentially affected: 265 vehicles

Mack campaign SC0340 · Owners notified September 8, 2008 · Vehicles built April 24, 2008 – May 14, 2008 (per NHTSA)

Defect description

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.

Safety consequence

THIS STANDARD SPECIFIES REQUIREMENTS FOR REQUIRED ORIGINAL AND REPLACEMENT LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT AND THEIR INSTALLATION. THE PURPOSE IS TO REDUCE TRAFFIC CRASHES, DEATHS AND INJURIES RESULTING FROM CRASHES BY PROVIDING ADEQUATE ILLUMINATION OF THE ROADWAY, AND ENHANCING THE CONSPICUITY OF MOTOR VEHICLES ON THE PUBLIC ROADS SO THAT THEIR PRESENCE IS PERCEIVED AND THEIR SIGNALS UNDERSTOOD, BOTH IN DAYLIGHT AND IN DARKNESS OR OTHER CONDITIONS OF REDUCED VISIBILITY.

Manufacturer remedy

DEALERS WILL INSPECT THE HEADLAMPS FOR THE SUSPECT DATE CODES AND REPLACE AS REQUIRED FREE OF CHARGE. THE RECALL BEGAN ON SEPTEMBER 8, 2008. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-528-6586.

Notes

MACK RECALL NO. SC0340.CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.

DASH CONTROL VALVES/BENDIX MV-3

NHTSA #08V177000 · Parking Brake — Conventional — Air · NHTSA notice

Reported April 17, 2008 · MACK TRUCKS, INC

Potentially affected: 66 vehicles

Mack campaign SC0339 · Owners notified May 9, 2008 · Vehicles built January 23, 2008 – February 6, 2008 (per NHTSA)

Defect description

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.

Safety consequence

IF THE DOUBLE CHECK VALVE BECOMES LODGED, IN THE EVENT OF A PRIMARY RESERVOIR FAILURE, AIR PRESSURE CAN LEAK PAST THE LODGED DOUBLE CHECK VALVE THEREBY DEPLETING THE SECONDARY RESERVOIR, CAUSING REDUCED ABILITY FOR MODULATING THE SERVICE EMERGENCY BRAKES INCREASING THE RISK OF A CRASH.

Manufacturer remedy

DEALERS WILL INSPECT THE MV-3 DASH VALVE FOR THE PRODUCTION DATE CODE. VALVES IN THE AFFECTED PRODUCTION LOTS WILL BE REPLACED FREE OF CHARGE. THE RECALL BEGAN ON MAY 9, 2008. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-528-6586.

Notes

MACK TRUCKS RECALL NO. SC0339.CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.

Other Mack GU model years

Check your 2009 Mack GU VIN

Not every recall applies to every VIN in a given year. Enter the 17-character VIN from your Mack GU at nhtsa.gov/recalls to see whether your specific vehicle has an unrepaired recall.

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