News — AFM Disabler

What is AFM/DFM? Can it be Disabled?

Posted by Bob McJannett on

What is AFM/DFM? Can it be Disabled?

Can Active Fuel Management (AFM) & Dynamic Fuel Management (DFM) be Disabled? What is AFM/DFM? An In-Depth Look Author: Jacob White | 08/17/2020 Active Fuel Management (AFM) was a system GM engineers developed back in 2005 to help improve the fuel mileage from some of their V6 and V8 engine applications. AFM shuts off half of your engines cylinders to operate at a reduced power level to reduce fuel consumption when running in low load and cruise situations. By 2019, GM had developed Dynamic Fuel Management (DFM) also known as Dynamic Skip Fire, which is a smarter version of AFM....

Read more →

What do the AFM Disabler lights mean?

Posted by Robert McJannett on

What do the AFM Disabler lights mean?

What do the AFM lights mean? Will I see V4 Mode?   Being a DISABLER, by definition, you will NOT see V4 Mode. On the latest AFM DISABLER Modules, the four blue lights are basically to indicate the unit is operating. THEY WILL GO OUT WHEN THE VEHICLE IS NOT RUNNING as described below (Power Saving). The lights are as follows:   LED #1 - Power is ON and unit is AWAKE and vehicle is ready for commands LED #2 - RPM > 500 and Engine is Running (not cranking or stalled) LED #3 - Vehicle V8 mode is legal (no engine damaging DTCs present or other parameters out...

Read more →

No lights on the AFM/DFM Disabler module?

Posted by Robert McJannett on

No lights on the AFM/DFM Disabler module?

No lights on the module? Check the fuse. Once in a while we run across a vehicle that has no power to the OBD2 port, which means our module cannot power up. This is usually due to the OBD2 fuse being blown and in most GM products this is shared with the CIG LTR fuse (not to be confused with the AUX PWR fuse, which is the other sockets). This fuse is usually located under the hood in the fuse box and labeled as CIG, CIG/LTR or CIG/OBD. An example of a typical Silverado fuse box is shown above. Your...

Read more →