2011 Mack CXU612 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
1 owner complaints analyzed
0 distinct recall campaigns
23,970 mi median reported failure mileage
Scope: 2011 model year. Data updated: . 1 complaints include usable failure mileage. View data status.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Structure:Frame And Members:Underbody Shields is the most frequently named component, appearing in 1 of 1 complaints (100.0%). A complaint can name multiple components.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Structure:Frame And Members:Underbody Shields | 1 |
| Suspension | 1 |
Structure:Frame And Members:Underbody Shields: 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 | 1 |
| 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 | 0 |
Under 25,000: 1; 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: 0
Under 25,000 miles has the most reports with usable mileage (1). 0 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 |
|---|---|
| 2011 | 1 |
2011: 1
Pattern summary
Structure:Frame And Members:Underbody Shields leads the component reports. 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.
Vehicle analysis explorer
Inspect model-year patterns, reported mileage, monthly activity and the evidence behind each signal.
Data completeness
1 unique complaints in this selection. Analysis snapshot: 2026-10-01.
Missing, zero and invalid mileage is excluded. Dates after the snapshot are excluded. Examples are limited selections, not a representative sample.
Problems by model year
Model-wide comparison of the eight most reported components across the model. Cells show counts and shares within each model year. Open a cell for source examples.
| Component | 2010 | 2011 |
|---|---|---|
| Trailer Hitches | 6100.0%ODI 10356665I AM A MECHANIC FOR ABF. FOR THE LAST THREE YEARS, MACK HAS SOLD TO ABF ROAD TRACTORS WITH DEFECTIVE 5TH WHEEL MOUNTING BOLTS. THE BOLTS STRETCH AND BECOME LOOSE WITH USE (USUALLY WITHIN THE FIRST 30,000 MILES). FOR UNKNOWN REASONS ABF HAS NEVER HELD MACK ACCOUNTABLE FOR THIS PROBLEM, PREFERRING TO TIGHTEN THE BOLTS WHEN A DRIVER COMPLAINS AND REPLACING BOLTS WHEN THEY PULL IN TWO. I HAVE REPEATEDLY WARNED MY SUPERVISORS THAT THESE BOLTS SHOULD BE REPLACED RATHER THAN REPEATEDLY RETORQUED, BUT HAVE BEEN REBUFFED DUE TO MANAGEMENT DISTRUST OF… | 00.0%No examples available for this selection. |
| Structure:Frame And Members | 350.0%ODI 10356871 · 63,450 miI AM A MECHANIC FOR ABF FREIGHT SYSTEM. I HAVE OBSERVED THAT MANY OF THE MACK TRUCKS WE USE IN OUR ROAD FLEET HAVE PREMATURE FAILURE OF THE FASTENERS HOLDING THE 5TH WHEEL COUPLER TO THE TRUCK FRAME. I WORKED ON UNIT 10016 ON 9/21/2010 AND CHECKED THE 5TH WHEEL BOLT TIGHTNESS AS A FOLLOW UP TO COMPLAINT #10356665. THE BOLTS WERE LOOSE AFTER ONLY 63,450 MILES OF SERVICE. I TRIED TO TIGHTEN THEM AS I HAD PREVIOUSLY BEEN ORDERED TO DO BUT THE BOLTS ONLY STRETCHED. I REPLACED THE 5TH WHEEL BOLTS. THE OLD BOLTS THAT HAD BEEN TIGHTENED WERE VISIBLY S… | 00.0%No examples available for this selection. |
| Suspension | 116.7%ODI 10356665I AM A MECHANIC FOR ABF. FOR THE LAST THREE YEARS, MACK HAS SOLD TO ABF ROAD TRACTORS WITH DEFECTIVE 5TH WHEEL MOUNTING BOLTS. THE BOLTS STRETCH AND BECOME LOOSE WITH USE (USUALLY WITHIN THE FIRST 30,000 MILES). FOR UNKNOWN REASONS ABF HAS NEVER HELD MACK ACCOUNTABLE FOR THIS PROBLEM, PREFERRING TO TIGHTEN THE BOLTS WHEN A DRIVER COMPLAINS AND REPLACING BOLTS WHEN THEY PULL IN TWO. I HAVE REPEATEDLY WARNED MY SUPERVISORS THAT THESE BOLTS SHOULD BE REPLACED RATHER THAN REPEATEDLY RETORQUED, BUT HAVE BEEN REBUFFED DUE TO MANAGEMENT DISTRUST OF… | 1100.0%ODI 10434361 · 23,970 miI 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 B… |
| Structure:Frame And Members:Underbody Shields | 00.0%No examples available for this selection. | 1100.0%ODI 10434361 · 23,970 miI 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 B… |
Darker cells indicate a larger share of submitted complaints. Components overlap. This measures complaint composition, not failure probability.
Failure mileage by component
Median and middle 50% of usable owner-reported mileages. Ranges require at least five records.
| Component | Mileage range (25th–75th percentile) | Median | Usable records | Examples |
|---|---|---|---|---|
| Structure:Frame And Members:Underbody Shields | Too few reports for a range | 23,970 mi | 1 (sparse) | ODI 10434361 · 23,970 miI 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 B… |
| Suspension | Too few reports for a range | 23,970 mi | 1 (sparse) | ODI 10434361 · 23,970 miI 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 B… |
Complaint and recall timeline
Explore monthly filing activity alongside recall announcements. Up to ten years of monthly history is available.
Solid line: filed complaints. Dashed amber lines: recall announcement dates for this vehicle selection; markers include all recall components. The latest month is partial. Temporal proximity does not establish causation.
Monthly counts, recall campaigns and complaint examples
| Month | Complaints | Campaigns announced | Examples |
|---|---|---|---|
| 2024-11 | 0 | None | No examples available for this selection. |
| 2024-12 | 0 | None | No examples available for this selection. |
| 2025-01 | 0 | None | No examples available for this selection. |
| 2025-02 | 0 | None | No examples available for this selection. |
| 2025-03 | 0 | None | No examples available for this selection. |
| 2025-04 | 0 | None | No examples available for this selection. |
| 2025-05 | 0 | None | No examples available for this selection. |
| 2025-06 | 0 | None | No examples available for this selection. |
| 2025-07 | 0 | None | No examples available for this selection. |
| 2025-08 | 0 | None | No examples available for this selection. |
| 2025-09 | 0 | None | No examples available for this selection. |
| 2025-10 | 0 | None | No examples available for this selection. |
| 2025-11 | 0 | None | No examples available for this selection. |
| 2025-12 | 0 | None | No examples available for this selection. |
| 2026-01 | 0 | None | No examples available for this selection. |
| 2026-02 | 0 | None | No examples available for this selection. |
| 2026-03 | 0 | None | No examples available for this selection. |
| 2026-04 | 0 | None | No examples available for this selection. |
| 2026-05 | 0 | None | No examples available for this selection. |
| 2026-06 | 0 | None | No examples available for this selection. |
| 2026-07 | 0 | None | No examples available for this selection. |
| 2026-08 | 0 | None | No examples available for this selection. |
| 2026-09 | 0 | None | No examples available for this selection. |
| 2026-10 (partial) | 0 | None | No examples available for this selection. |
Emerging complaint spikes
Complete months in the latest six months with at least 10 complaints, at least twice the preceding 12-month average, and at least three square-root deviations above that average.
This is a descriptive screening rule, not a statistical defect finding. Publicity and reporting changes can increase submissions.
No complete months meet the spike thresholds for this selection.
Equal-age model-year comparison
Model-wide cumulative reports during the first three or five calendar years, starting with the model year (age 0). Only fully elapsed windows are compared.
2010: 6 complaints · 2011: 1 complaints
| Model year | Through age 0 | Through age 1 | Through age 2 |
|---|---|---|---|
| 2010 | 4 | 6 | 6 |
| 2011 | 1 | 1 | 1 |
Date coverage across each selected cohort
| Year | Incident dates used | Filing date fallbacks | Excluded dates |
|---|---|---|---|
| 2010 | 6 | 0 | 0 |
| 2011 | 1 | 0 | 0 |
Incident date is preferred when valid and no later than filing; otherwise filing date is used. Model year approximates age. Equal observation time does not adjust for sales, distance driven or reporting delays. One complaint linked to multiple model years can appear in each cohort.
Components reported together
Each cell counts unique complaints naming both components. Open a nonzero cell for examples.
| Component | Structure:Frame And Members:Underbody Shields | Suspension |
|---|---|---|
| Structure:Frame And Members:Underbody Shields | — | 1ODI 10434361 · 23,970 miI 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 B… |
| Suspension | 1ODI 10434361 · 23,970 miI 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 B… | — |
Co-reporting does not establish that one component caused another concern.
Recurring narrative patterns
Specific keyword mentions beyond broad component labels. Matching includes negations and comparisons and does not confirm a diagnosis.
0 patterns with matching reports.
No narratives match the published patterns.