GM said Monday it will build some versions of the Chevrolet Silverado and the GMC Sierra without a fuel management module that improves mileage by about 1 mile per gallon.
Unfortunately for buyers, even once the chips are available, GM will not be able to retrofit the engines with the missing fuel management module. So the decrease in mileage, to about 16 miles per gallon from 17, will be permanent.
Buyers will get a small consolation prize a $50 credit off of the list price of the vehicle. The mileage sticker in the window will also be changed to reflect a lower mileage, according to GM spokeswoman Michelle Malcho.
The affected versions of the trucks are those that have a 5.3-liter EcoTec3 V8 engine and either a 6- or 8-speed automatic transmission.
GM has also built some vehicles without missing computer chips, planning to add them once available after the rest of production is complete.
But it has been trying to maintain production of its relatively hot-selling full-size pickups like the Silverado and the Sierra, as well as full-size SUVs. These versions of the pickups are considered a “light duty” version of the trucks, with a smaller engine than the “heavy duty” models.