Mack bulletin M0310 202405
What it saysMack Trucks has identified that the Selective Catalyst Reduction (SCR) system in certain vehicles equipped with the MY 2017 or 2018 MP8 (13L VGT) engine are not meeting California and EPA emissions standards, or Mack… NHTSA’s full summary ↓
Mack filed this with NHTSA as an emissions communication dated May 28, 2024, received Jun 4, 2024, about the engine. It names 9 model years (2017–2018). An emissions communication is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Emission Recall: Mack Trucks has identified that the Selective Catalyst Reduction (SCR) system in certain vehicles equipped with the MY 2017 or 2018 MP8 (13L VGT) engine are not meeting California and EPA emissions standards, or Mack cannot confirm its compliance. These vehicles have been flagged due to telematics data showing that the NOx conversion efficiency of the SCR system has dropped below 94% for eight weeks. Alternatively, these vehicles may have communication issues with telematics, such as not reporting or ceasing reporting for the same period.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| M0310 202405 | Emissions | May 28, 2024 | 11000826 | PDF, 454 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against: 2017 Mack Anthem (an); 2018 Mack Anthem (an); 2017 Mack CHU; 2018 Mack CHU; 2017 Mack CXU; 2018 Mack CXU; 2017 Mack Granite (gu); 2018 Mack Granite (gu); 2018 Mack Pinnacle (pi/pn).
None of these model years has a page on this site (it covers EPA-certified cars, trucks and SUVs from 2016), so the bulletin is listed here on its own.
More bulletins about the engine
Source: same model, same component group15 other manufacturer communications filed against these Mack models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Mack list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S4533 202608 | Service campaign | Aug 5, 2026 | Mack Trucks has determined that certain AN model trucks equipped with an MP8 Turbo Compound (TC) engine may experience TC Double Idler Gear… |
| M0304 EC0033 202606 | Emissions | Jun 29, 2026 | Mack Trucks has determined that certain vehicles equipped with a model year (“MY”) 2017-2018 MP8 Turbo Compound (TC) engine may not meet Cal… |
| M0039 032026 | Emissions | Mar 2, 2026 | Emissions - EC0039 MST21 Failure to Detect P20EE - AN, CHU. |
| M0302 022026 | Emissions | Feb 1, 2026 | Emissions - Mack Trucks has determined that certain vehicles equipped with a model year (“MY”) 2017-2018 MP7 engine may not meet California… |
| S4533 072025 | Service campaign | Jul 1, 2025 | SC - Mack Trucks has determined that certain AN model trucks equipped with an MP8 Turbo Compound (TC) engine may experience TC Double Idler… |
| M0350 202504 | Emissions | Apr 2, 2025 | ER - Mack Trucks has identified that the Selective Catalyst Reduction (SCR) system in certain vehicles equipped with the MY 2017 or 2018 MP8… |
| M0311 202410 | Emissions | Oct 25, 2024 | EMISSION RECALL - SCR Replacement |
| M0310 202410 | Emissions | Oct 25, 2024 | EMISISON RECALL - SCR Replacement. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mack, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mack M0310 202405 a recall?
No. A emissions communication is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls.
Is the M0310 202405 repair free?
A emissions communication is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does M0310 202405 cover?
The manufacturer filed it against 9 model years: 2017 Mack Anthem (an), 2018 Mack Anthem (an), 2017 Mack CHU, 2018 Mack CHU, 2017 Mack CXU, 2018 Mack CXU and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built on or after 6 Sep 2016 — the build date is on the certification label in the driver’s door jamb.