Mack CXU problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
5 owner complaints analyzed
14 distinct recall campaigns
241,442 mi median reported failure mileage
Scope: 2006 to 2016 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
Trailer Hitches is the most frequently named component, appearing in 2 of 5 complaints (40.0%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Transmission and shifting | 1 | 20.0% |
| Engine operation | 1 | 20.0% |
| Braking behavior | 1 | 20.0% |
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 |
|---|---|
| Trailer Hitches | 2 |
| Engine | 1 |
| Power Train | 1 |
| Structure | 1 |
| Structure:Frame And Members | 1 |
| Suspension | 1 |
Trailer Hitches: 2; Engine: 1; Power Train: 1; Structure: 1; Structure:Frame And Members: 1; Suspension: 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 | 0 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 2 |
Under 25,000: 0; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 2
150,000 and above miles has the most reports with usable mileage (2). 3 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 |
|---|---|
| 2010 | 2 |
| 2011 | 1 |
| 2019 | 1 |
| 2025 | 1 |
2010: 2; 2011: 1; 2019: 1; 2025: 1
Pattern summary
Trailer Hitches leads the component reports. Transmission and shifting appears in 1 complaint narratives. Engine operation appears in 1 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 10357279 · 2010-09-23 (September 23, 2010)
MY COWORKER WAS CHANGING THE OIL ON A 2009 MACK AND I HAPPENED TO NOTICE THAT THE 5TH WHEEL PLATE WAS SHIFTING AROUND ON THE FRAME. I APPLIED A BOX END WRENCH TO THE MOUNT BOLTS AND DISCOVERED THAT ALL TEN OF THE FASTENERS HOLDING THE 5TH WHEEL TO THE FRAME COULD BE TURNED EASILY USING ONE HAND. THAT IS NOT MY IDEA OF BEING SECURELY ATTACHED! NO ACTION WAS TAKEN ON THIS TRUCK BECAUSE IT WAS TIME TO GO HOME AND IF THE BOSS DOESN'T CARE AND MACK DOESN'T CARE WHAT CAN I DO EXCEPT COMPLAIN TO THE FEDERAL GOVERNMENT THAT MACK IS USING SUBSTANDARD BO…
Owner-reported narrative. 179,708 miles reported. Look up ODI 10357279 at NHTSA ↗
Owner report 11697726 · 2025-11-05 (November 5, 2025)
Second occurrence of below happening, first time being 11/28/25, and most recently 11/05/25. Clutch engaged uncommanded while stopped with service brakes engaged. Truck kept trying to power through the service brakes until it was forcefully stalled out with service brakes. Truck is start-able immediately afterwards, but not drivable with engine stop warning lamp illuminated and a error message "Neutral Gear Not Secured" Nearly rear ended a stopped vehicle in front of truck, so yeah, slight safety concern of uncommanded movement of vehicle. H…
Owner-reported narrative. Look up ODI 11697726 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 |
|---|---|
| 2006 | 1 |
| 2007 | 3 |
| 2008 | 7 |
| 2009 | 3 |
| 2010 | 7 |
| 2016 | 1 |
2006: 1; 2007: 3; 2008: 7; 2009: 3; 2010: 7; 2016: 1