Mack GU problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
6 owner complaints analyzed
14 distinct recall campaigns
33,758 mi median reported failure mileage
Scope: 2007 to 2018 model years. Data snapshot: . 2 complaints include usable failure mileage.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Engine is the most frequently named component, appearing in 2 of 6 complaints (33.3%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Electrical and battery issues | 2 | 33.3% |
| Braking behavior | 1 | 16.7% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine | 2 |
| Power Train | 2 |
| Electrical System | 1 |
| Exterior Lighting | 1 |
| Structure:Body | 1 |
| Vehicle Speed Control | 1 |
| Visibility/Wiper | 1 |
Engine: 2; Power Train: 2; Electrical System: 1; Exterior Lighting: 1; Structure:Body: 1; Vehicle Speed Control: 1; Visibility/Wiper: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 1 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 1 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 1; 25,000 to 49,999: 0; 50,000 to 74,999: 1; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (1). 4 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2014 | 1 |
| 2016 | 2 |
| 2018 | 1 |
| 2021 | 1 |
| 2022 | 1 |
2014: 1; 2016: 2; 2018: 1; 2021: 1; 2022: 1
Pattern summary
Engine leads the component reports. Electrical and battery issues appears in 2 complaint narratives. Braking behavior appears in 1 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11130249 · 2018-09-18 (September 18, 2018)
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 UP TO ECM. WILL NEED ECM,HARNESS,OIL LEVEL, OIL PRESSURE SENSORS AND EGR VENTURI FRONT CAB MOUNTS ARE WORE CAUSING AIR CLEANER HEAT SHEILD TO RUB THOUGHT VALVE COVER. NEED TO REPAIR ENGINE BEFORE ANYMORE T/S.
Owner-reported narrative. 58,500 miles reported. Look up ODI 11130249 at NHTSA ↗
Owner report 11460974 · 2022-04-15 (April 15, 2022)
Wipers do not work and the tractor lights turn off ALL of the lights the trailer lights go out as well the fuse for these electrical components gets very hot, this makes it very dangerous when driving at night and when it's raining. The driver has to pull over till he can get the lights to come back on
Owner-reported narrative. Look up ODI 11460974 at NHTSA ↗
Owner report 10567416 · 2014-03-05 (March 5, 2014)
TL* THE CONTACT OWNS A 2010 MACK TRUCK GU712. THE DRIVER WAS TRAVELING 30 MPH AND ATTEMPTED TO DECELERATE WHEN THE VEHICLE SUDDENLY ACCELERATED. THE DRIVER WAS ABLE TO APPLY THE BRAKES AND MAINTAIN CONTROL OF THE VEHICLE. THE ENGINE RPMS INCREASED 12000-17000, AND CONTINUED TO INCREASE WHEN THE ENGINE WAS SHUT OFF. THE CERTIFIED MECHANIC INSPECTED THE TRUCK AND REPLACED THE THROTTLE. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE AND CURRENT MILEAGE WAS 9,015. UPDATED 05/12/14*LJ THE CONSUMER STATED…
Owner-reported narrative. 9,015 miles reported. Look up ODI 10567416 at NHTSA ↗
Recalls by model year
All campaigns in the snapshot affecting each model year, including recalls announced years later.
Recall campaigns
Shared campaigns appear once in each affected model year.
| Category | Count |
|---|---|
| 2007 | 2 |
| 2008 | 9 |
| 2009 | 7 |
| 2010 | 4 |
| 2011 | 5 |
| 2013 | 0 |
| 2014 | 0 |
| 2015 | 0 |
| 2018 | 0 |
2007: 2; 2008: 9; 2009: 7; 2010: 4; 2011: 5; 2013: 0; 2014: 0; 2015: 0; 2018: 0