Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/3,000mi.Have underbody flushing service performed. See "Underbody Maintenance" inExterior Care.
Power Mode Description and Operation
GMLAN and Media Oriented Systems Transport (MOST) Wiring RepairsRelieving Fuel Pressure Warning Fuel System
Warning:Remove the fuel tank cap and relieve the fuel system pressurebefore servicing the fuel system in order to reduce the risk ofpersonal injury. After you relieve the fuel system pressure, asmall amount of fuel may be released when servicing the fuel lines,the fuel injection pump, or the connect ...