AI Damage2021 Paccar MX-13: common problems
The maker issued 27 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 27
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine | 0 | 0 | 14 |
| Engine and cooling | 0 | 0 | 9 |
| Electrical system | 0 | 0 | 5 |
| Powertrain | 0 | 0 | 5 |
| Fuel/propulsion system | 0 | 0 | 2 |
| Fuel system | 0 | 0 | 2 |
| Equipment | 0 | 0 | 1 |
Comparison
What to check before buying
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- 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.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- "Kenworth
Dealers should check the chassis list and SIR weekly for VIN changes. 2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the…
- The attached procedure has been updated to improve clarity
- Kenworth - The Warranty section has been updated to include Peterbilt-specific SRT codes for…
Kenworth - The Warranty section has been updated to include Peterbilt-specific SRT codes for cross-division repair filing.
- Expiration Date Format Update - Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve…
Expiration Date Format Update - Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will…
- EPA17-24 MX-13 Fuel Injector Connector - This bulletin has been revised to include EPA24 PACCAR MX-13 engines
- Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail
This failure can cause significant damage to the engine. New intake valve springs will be installed.
- EPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of…
EPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of the injector connector shells
- A new Level 1 required MX-11 and MX-13 Oil Pressure Switch Breakout Harness is now available for order
- In an MX Engine is replaced, a TCS365 case must be opened to get a replacement engine emissions compliance…
In an MX Engine is replaced, a TCS365 case must be opened to get a replacement engine emissions compliance label and expert level rights for resetting and programming the engine control module.
- Fuel Injector Pump Part#2185361 for MX-13 Engines has been added to the warranty policy
- Condition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be…
Condition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be flagged and open in Service Information Record (SIR) at the time of RO open date to qualify.” Also, “Through Standard…
- "PSB E327
PACCAR MX-11 and MX-13 OBD Software Update Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly. PCI-2 software on these chassis must be reverted…
NHTSA lists 27 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2021 Paccar MX-13?
There are no owner complaints in the NHTSA data for this year; the data comes from 27 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2021 Paccar MX-13?
NHTSA lists 27 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 Paccar MX-13 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.