The inspections and services that are listed in this section should be performed yearly. You should let your authorized GM dealer's service department or other qualified service center do these jobs. Make sure any necessary repairs are completed at once.

Proper procedures to perform these services may be found in a service manual. See "Service and Owner Publications" in the Index of your owner manual.

High Pressure Regulator (HPR) Coolant Hoses Inspection

Inspect the hoses and have them replaced if they are cracked, swollen or deteriorated. Inspect all pipes, fittings and clamps; replace if necessary.

CNG Fuel System Leak Inspection (†)

Inspect the entire CNG fuel system for leaks once a year using an electronic leak detector. If a leak is found, have the CNG fuel system repaired.

CNG Labels Inspection

Once a year, inspect the CNG diamond label at the right rear of the vehicle and the CNG fuel only label located on the fuel fill door. Replace any label if peeling, faded or damaged.

CNG Fuel Tank and Mounting Bracket Inspection

Caution: Compressed Natural Gas (CNG) is extremely flammable. If something accidentally ignites it, you could be badly burned. Keep sparks, flames and smoking materials away from natural gas. Do not smoke if you are near natural gas or refueling your vehicle.

Caution: Keeping a CNG fuel tank in service after the tank service expiration date is dangerous and is prohibited by federal law. The tank may no longer withstand the CNG fuel system operating pressure. You could be severely injured or killed. Take your vehicle to an authorized GM dealer to have the tank replaced.

A trained technician must remove the tank cover and perform a CNG fuel tank and mounting bracket inspection every three years or 36,000 miles (60 000 km), whichever occurs first (Federal Motor Vehicle Safety Standard 304). Take your vehicle to the nearest authorized GM dealer for this inspection.

The CNG fuel tank installed in your vehicle conforms to U.S. and Canadian safety standards applicable to motor vehicles.

Service pressure 3,600 psi (24.8 MPa).

See instructions on the fuel container for inspection and service life.

The CNG fuel tank has a service life of 15 years. After the tank expiration date, an authorized dealer must replace the tank. This date is listed on the fuel tank, the CNG fuel fill door label and the underhood CNG fuel system information label.