AI Damage2021 Mack Pinnacle (pi/pn): common problems
The maker issued 197 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 197
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 0 | 0 | 77 |
| Electrical system | 0 | 0 | 48 |
| Powertrain | 0 | 0 | 29 |
| Engine | 0 | 0 | 14 |
| Equipment | 0 | 0 | 14 |
| Service brakes | 0 | 0 | 12 |
| Suspension | 0 | 0 | 11 |
| Fuel system | 0 | 0 | 9 |
| Structure | 0 | 0 | 4 |
| Wheels | 0 | 0 | 4 |
| Fuel/propulsion system | 0 | 0 | 3 |
| Vehicle speed control | 0 | 0 | 3 |
| Exterior lighting | 0 | 0 | 2 |
| Steering | 0 | 0 | 2 |
Comparison
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…
Mack Trucks Equipped With A Cummins Engine - Engine Preheat Icon Does Not Illuminate In The Instrument Cluster (IC) During Engine Pre-heat (Intake Air Heater) Operation - Vehicles With 2018Instrument Cluster Update…
- CBR - Mack Chassis - Dash Panel Cracking at Mounting to BIW
- CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers
- CBR - Mack Carrier Nut Adhesive Change
- CBR - Z Spring Bracket Wear
- CBR - No Start Condition After Over the Air Programing
- CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT…
CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT APPLY TO AN(4) and PR(4)).
- Vehicles affected by this issue will show coolant runoff on the front rights side of the engine
- CBR - Mack Temperature Sensor Troubleshooting Guide
- CBR - 13 Liter Engines ONLY - Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct…
CBR - 13 Liter Engines ONLY - Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct Cover Or In Between The Coolant Pump Housing And Oil Cooler Housing.
- CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job…
CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job ends in a Critical failure, the vehicle will remain in Safe State.
- CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded
NHTSA lists 197 bulletins for this year; the 12 newest are shown here.
Other years of this model
- Pinnacle (pi/pn) 201611 sources
- Pinnacle (pi/pn) 201716 sources
- Pinnacle (pi/pn) 2018219 sources
- Pinnacle (pi/pn) 2019203 sources
- Pinnacle (pi/pn) 2020194 sources
- Pinnacle (pi/pn) 2022198 sources
- Pinnacle (pi/pn) 2023130 sources
- Pinnacle (pi/pn) 2024104 sources
- Pinnacle (pi/pn) 202519 sources
- Pinnacle (pi/pn) 202614 sources
- Pinnacle (pi/pn) 20275 sources
Questions and answers
What are the most common problems with the 2021 Mack Pinnacle (pi/pn)?
There are no owner complaints in the NHTSA data for this year; the data comes from 197 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2021 Mack Pinnacle (pi/pn)?
NHTSA lists 197 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2021 Mack Pinnacle (pi/pn) from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2021 models
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.