Mack service campaign S4536 202506
What it saysMack Trucks has identified that certain MDe model trucks may have complications with the instrument cluster displaying a message requesting the truck be shifted into neutral when the driver’s door is opened… NHTSA’s full summary ↓
Mack filed this with NHTSA as a service campaign dated Jun 1, 2025, received Jul 1, 2025, about the electrical system. It names 3 model years (2024–2026). A service campaign 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 communicationMack Trucks has identified that certain MDe model trucks may have complications with the instrument cluster displaying a message requesting the truck be shifted into neutral when the driver’s door is opened, and the truck is already in neutral. Some trucks may also experience issues related to instrument clusters missing the VINNO parameter, affecting Geotab’s ability to read the datalink. Follow the instructions below to update the software in the instrument cluster.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| S4536 202506 | Service campaign | Jun 1, 2025 | 11019949 | PDF, 229 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: 2024 Mack MD (electric); 2025 Mack MD (electric); 2026 Mack MD (electric).
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 electrical system
Source: same model, same component group6 other manufacturer communications filed against the Mack MD (electric) under the same component group (electrical system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S5025 202608 | Service campaign | Aug 2, 2026 | Certain MMDe model Mack trucks were assembled without fuse and relay center labels. |
| S4285 202512 | Service campaign | Dec 2, 2025 | SC - MMDe Instrument Cluster Software |
| S4245 202512 | Service campaign | Dec 2, 2025 | Mack Trucks has identified that certain MDE model trucks may have inadequate torque at the high-voltage connections of the drive motor. Insu… |
| S4285 202412 | Service campaign | Dec 2, 2024 | Mack Trucks has developed a software accessory kit for the instrument cluster (IC) on certain MD6-BE and MD7-BE model trucks. |
| S4245 202411 | Service campaign | Nov 1, 2024 | Mack Trucks has identified that certain MDE model trucks may have inadequate torque at the high-voltage connections of the drive motor. Insu… |
| S4115 202407 | Service campaign | Jul 24, 2024 | Service Campaign: Mack MDE Bundle |
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 S4536 202506 a recall?
No. A service campaign 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 S4536 202506 repair free?
A service campaign 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 S4536 202506 cover?
The manufacturer filed it against 3 model years: 2024 Mack MD (electric), 2025 Mack MD (electric), 2026 Mack MD (electric). Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.