The Compressed Natural Gas (CNG) fuel system wiring in your vehicle is protected from short circuits by the AF (Alternative Fuel) Lockoff fuse and the AF relay. If a CNG fuel system fuse is bad, your vehicle will start and operate on gasoline.
Instrument Panel Fuse Block
The instrument panel fuse block is located at the left end of the instrument panel. To open, push the tab on the access door to the left and pull the door forward. Make sure to insert tabs when replacing the cover.
Fuses | Usage |
|---|---|
IGN MDL | Engine Ignition Module |
PCM | CNG Rail and Tank Valves, Engine Ignition Module, PCM, CNG Injector Driver Module, Fuel Gage Selector Switch, Fuel Mode Indicator |
For information about the rest of the fuses/relays in the instrument panel fuse block, see "Fuses and Circuit Breakers" in the Index of your GM Owner's Manual.
Engine Compartment Fuse Block
The engine compartment fuse block is located on the driver's side of the engine compartment. Lift off the cover to check the fuses.
Fuses | Usage |
|---|---|
AF Lockoff | CNG Rail and Tank Valves |
AF | CNG Fuel Mode Relay, CNG Injectors |
PCM | PCM, CNG Injector Drive Module |
Relays | Usage |
|---|---|
AF | CNG Injectors |
For information on the rest of the fuses/relays in your engine compartment fuse block see "Fuses and Circuit Breakers" in the Index of your GM Owner's Manual.
