Some 2023-2024 GMC Sierra Units Will Need An Engine Control Module Fix

Certain units of the 2023 through 2024 GMC Sierra 1500 pickup motivated by the turbocharged 2.7L I4 L3B gasoline engine are included in a new GM Service Update containing a fix available for a fuel injector flow rate problem.

The Engine Control Module (ECM) of the affected GMC Sierra units is incorrectly programmed, per Service Update N242452130. This could potentially lead to improper fuel flow rate during certain types of driving.

As a reminder, the turbocharged 2.7L I4 L3B engine involved in the Service Update develops 310 horsepower and 430 pound-feet of torque in the 2023 and 2024 GMC Sierra 1500.

The exact number of affected units is currently unclear. GM instructs dealership service to apply the available fix to any vehicles still in stock and to affected GMC Sierra trucks brought in by their owners for other services. The repair is offered free of charge to current owners of the vehicles through March 31^st, 2040.

No components need to be replaced to repair the fuel injector flow rate. To calibrate the flow rate correctly, the service personnel must reprogram the Engine Control Module with new settings. The whole process, including verifying the issue and reprogramming the ECM, takes about 30 minutes on average.

GM issued a very similar service update with an ECM fix for a fuel injector flow rate problem for 2019–2022 model-year Sierra 1500 units powered by the L3B engine. Service Update N242450631 called for the same fix in the earlier trucks.

Three other engine options for the affected model years, including the naturally aspirated 5.3L V8 L84 gasoline engine developing 355 horsepower and 383 pound-feet of torque, the naturally aspirated 6.2L V8 L87 gasoline engine rated at 420 horsepower and 460 pound-feet, and the 3.0L I6 LZ0 turbodiesel Duramax rated at 305 horsepower and 495 pound-feet, are not affected by the issue or included in the Service Update.