Hearth Record

Engine and engine cooling: engine: engine control module (ecu/ecm): software (Mack)

Vehicle recall 26V-139. NHTSA received Mack Trucks, Inc.’s report on Mar 11, 2026.

NHTSA’s own record, on nhtsa.gov

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The short answer

NHTSA received Mack Trucks, Inc.’s report on Mar 11, 2026. Copied from NHTSA on Oct 26, 2026.

Every line below is in NHTSA’s own words, with its source beside it.

What’s wrong with it?

Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.

Mack Trucks, Inc.

(Mack) is recalling certain 2022-2027 TerraPro trucks.

The engine control unit (ECU) software may allow the engine to start when the transmission is not in Neutral.

As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 102, “Transmission Shift Lever Sequence, Starter Interlock, and Transmission Braking Effect.”

Source:

NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.

  • NHTSA’s part: Engine and engine cooling: engine: engine control module (ecu/ecm): software.

What should you do?

Dealers will update the ECU software, free of charge. Owner notification letters were mailed April 14, 2026. Owners may contact Mack’s customer service at 1-800-866-1177. Mack’s number for this recall is SC0492. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov March 18, 2026.

Source:

NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.

  • Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.

Which ones are recalled?

NHTSA counts 775 vehicles potentially involved, across everything this recall names.

Each model year opens its own page: every recall naming it, its owner complaints and its crash ratings.

Source:

NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.

Who is recalling it?

  • Made by Mack Trucks, Inc..
Source:

NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.

What the record doesn’t say

  • NHTSA’s recall file doesn’t say whether anyone was hurt. Owners’ complaints are counted on each vehicle’s page.
  • Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
  • How many have been returned or fixed isn’t in the notice.
Source:

Hearth Record wrote these lines.

Sources

  • National Highway Traffic Safety Administration, Recalls flat file (FLAT_RCL_POST_2010).

    Released Oct 26, 2026 and checked Oct 26, 2026. Updated daily. Public domain (U.S. Government work).

Source:

Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 26, 2026.

How to read a record

Four things every record does, shown on an example record made up for this guide.

An example record, made up for this guide

An example nursing home

Made up for this guide: no real place is shown

Not fully inspected in over two years (CMS flag)

11 health citations at the latest inspection cycle

The state average is 14.3.

Source:

CMS, State and US Averages and Health Deficiencies. Released Oct 28, 2026. Updated monthly.

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Every fact names its source.

Who published it, when, and how often it changes sit beside each fact, with a link to the agency’s own file.

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