Total Complaints
2 filings
MACK CXU612 · model year
2011 MACK CXU612
2 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2011MACKCXU612 carries 2 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 0 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2011 CXU612 is structure:frame and members:underbody shields with 1 filings, followed by suspension (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 1 investigation file overlapping the 2011 CXU612. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
2
Complaints
0
Crashes
0
Fires
0
Injuries
0
Deaths
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
Complaints vs. fleet median (215)
At or below the fleet median complaint volume.
Complaints by Component
| Component | Count |
|---|---|
| STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS | 1 |
| SUSPENSION | 1 |
Recent Complaints
20111106STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS
I AM A MAINTENANCE MECHANIC FOR A LARGE TRUCKING FIRM. ON 4 OCT 2011, I CHECKED THE TORQUE ON THE 5TH WHEEL BOLTS OF UNIT 11054 BECAUSE I COULD SEE THAT THE 5TH WHEEL WAS SLIDING ON THE FRAME. THE BOLTS WERE DEFECTIVE - YIELDING PRIOR TO REACHING THE RECOMMENDED TORQUE OF 236 FT.LB. I ADJUSTED THE TORQUE WRENCH TO 200 FT.LB., ITS LOWEST SETTING, AND COULD NOT GET ANY OF THE BOLTS TO HOLD. I REPLACED ALL TEN BOLTS WITH 5/8" GRADE 8 HARDWARE INSTEAD OF THE FACTORY 16MM 10.9 METRIC BECAUSE THAT WAS ALL WE HAD AVAILABLE. THERE WAS NO INTERFERENCE BETWEEN THE 5TH WHEEL BOLTS AND THE HUCK RIVETS ON THE FRAME RAIL. THE BOLTS WERE WEAK. *TR
Mileage: 23,970
20111106SUSPENSION
I AM A MAINTENANCE MECHANIC FOR A LARGE TRUCKING FIRM. ON 4 OCT 2011, I CHECKED THE TORQUE ON THE 5TH WHEEL BOLTS OF UNIT 11054 BECAUSE I COULD SEE THAT THE 5TH WHEEL WAS SLIDING ON THE FRAME. THE BOLTS WERE DEFECTIVE - YIELDING PRIOR TO REACHING THE RECOMMENDED TORQUE OF 236 FT.LB. I ADJUSTED THE TORQUE WRENCH TO 200 FT.LB., ITS LOWEST SETTING, AND COULD NOT GET ANY OF THE BOLTS TO HOLD. I REPLACED ALL TEN BOLTS WITH 5/8" GRADE 8 HARDWARE INSTEAD OF THE FACTORY 16MM 10.9 METRIC BECAUSE THAT WAS ALL WE HAD AVAILABLE. THERE WAS NO INTERFERENCE BETWEEN THE 5TH WHEEL BOLTS AND THE HUCK RIVETS ON THE FRAME RAIL. THE BOLTS WERE WEAK. *TR
Mileage: 23,970
Compare 2011MACKCXU612 to Similar Vehicles
NHTSA Investigations
Frequently Asked Questions
How many complaints does the 2011 MACK CXU612 have?▼
The 2011 MACK CXU612 has 2 NHTSA complaints, 0 crashes, 0 fires, 0 injuries, and 0 deaths reported.
What are the most common problems with the 2011 MACK CXU612?▼
The most-complained component for the 2011 MACK CXU612 is STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS with 1 complaints. Other frequently reported areas include SUSPENSION.
Is the 2011 MACK CXU612 safe to buy?▼
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?▼
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.
Vehicle Safety Guides
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.