Test Description
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Hummer H2, 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, and 2003 GMC Cab & Chassis Sierra. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedure.
- 5
If conditions were not corrected, see appropriate BASIC DIAGNOSTIC PROCEDURES article. - 6
If conditions were not corrected, a worn cam, worn intake or exhaust valves, or other engine mechanical failures may be at fault.