AI DamageMack CHU: problems, complaints, bulletins
Summary for the Mack CHU across 3 model years: 0 owner complaints and 296 NHTSA service bulletins, plus repair videos. Pick a year for details.
Model years
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 0 | 0 | 249 |
| Electrical system | 0 | 0 | 103 |
| Powertrain | 0 | 0 | 101 |
| Equipment | 0 | 0 | 89 |
| Engine | 0 | 0 | 61 |
| Fuel system | 0 | 0 | 57 |
| Suspension | 0 | 0 | 44 |
| Service brakes | 0 | 0 | 24 |
| Vehicle speed control | 0 | 0 | 16 |
| Structure | 0 | 0 | 9 |
| Fuel/propulsion system | 0 | 0 | 8 |
| Electronic stability control | 0 | 0 | 6 |
| Forward collision avoidance | 0 | 0 | 4 |
| Wheels | 0 | 0 | 4 |
What to check before buying
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Mack Trucks Equipped With A Cummins Engine - Engine Preheat Icon Does Not Illuminate In The Instrument…
- CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers
- CBR - Mack Carrier Nut Adhesive Change
- Emissions - EC0039 MST21 Failure to Detect P20EE - AN, CHU
- CBR - Z Spring Bracket Wear
- CBR - The purpose of this solution is to give information on Engine Control Module (EMS) Software content
- CBR - Mack Chassis - Engine Brake Only Works With The Brake Pedal, No Function During Cruise
- CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT…
- CBR - Mack Temperature Sensor Troubleshooting Guide
- CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded
- CBR - A significant GPS reporting issue is affecting fleet operations, with trucks maintaining back-office…
- Mack Chassis - Rear Axle Overheat
Other models of this make
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.